Journal of Electroanalytical Chemistry最新文献_第7页

A novel physical criterion for modeling repassivation based on an extended point defect model 基于扩展点缺陷模型的再钝化建模新物理准则

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-01 Epub Date: 2026-01-22 DOI: 10.1016/j.jelechem.2026.119838

Nikos Alexiadis , Alexander Fuchs , Torsten Troßmann , Jorg Thöming , Fabio La Mantia

The ability of metals to re-form passive films is crucial for ensuring the longevity and reliability of critical components in demanding environments. Building on an extended Point Defect Model (PDM) considering chloride ion induced passive film breakdown, we introduce a physical criterion to model the dynamics of self-healing from a depassivated state. The stainless steel AISI 316 L was selected due to its practical relevance and the availability of published data demonstrating the dependence of repassivation on environmental factors. Cyclic voltammetry (CV) sweeps under varying chloride ion concentrations, temperatures, pH values and scan rates were simulated using the enhanced extended PDM. The predicted shifts in key electrochemical system responses, such as corrosion current, open circuit potential, induction time, critical breakdown potential and the repassivation potential, align well with literature findings. Furthermore, the model predicts passive film breakdown at low potentials, a phenomenon consistent with both experimental observations and fundamental thermodynamics. The capability to forecast passive film breakdown and repassivation facilitates optimal material selection and thus enhances component operation under transient environmental loads.

金属重新形成钝化膜的能力对于确保关键部件在苛刻环境中的寿命和可靠性至关重要。在考虑氯离子诱导钝化膜击穿的扩展点缺陷模型（PDM）的基础上，我们引入了一个物理准则来模拟钝化膜自愈的动力学过程。选择不锈钢AISI 316 L是由于其实际相关性和公开数据的可用性，证明了再钝化对环境因素的依赖性。利用增强型扩展PDM模拟了不同氯离子浓度、温度、pH值和扫描速率下的循环伏安法（CV）扫描。预测的关键电化学系统响应的变化，如腐蚀电流、开路电位、感应时间、临界击穿电位和再钝化电位，与文献研究结果一致。此外，该模型预测了低电位下钝化膜的击穿，这一现象与实验观察和基本热力学一致。预测钝化膜击穿和再钝化的能力有助于优化材料选择，从而提高组件在瞬态环境负载下的运行。

{"title":"A novel physical criterion for modeling repassivation based on an extended point defect model","authors":"Nikos Alexiadis , Alexander Fuchs , Torsten Troßmann , Jorg Thöming , Fabio La Mantia","doi":"10.1016/j.jelechem.2026.119838","DOIUrl":"10.1016/j.jelechem.2026.119838","url":null,"abstract":"<div><div>The ability of metals to re-form passive films is crucial for ensuring the longevity and reliability of critical components in demanding environments. Building on an extended Point Defect Model (PDM) considering chloride ion induced passive film breakdown, we introduce a physical criterion to model the dynamics of self-healing from a depassivated state. The stainless steel AISI 316 L was selected due to its practical relevance and the availability of published data demonstrating the dependence of repassivation on environmental factors. Cyclic voltammetry (CV) sweeps under varying chloride ion concentrations, temperatures, pH values and scan rates were simulated using the enhanced extended PDM. The predicted shifts in key electrochemical system responses, such as corrosion current, open circuit potential, induction time, critical breakdown potential and the repassivation potential, align well with literature findings. Furthermore, the model predicts passive film breakdown at low potentials, a phenomenon consistent with both experimental observations and fundamental thermodynamics. The capability to forecast passive film breakdown and repassivation facilitates optimal material selection and thus enhances component operation under transient environmental loads.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119838"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Scalable anodic electrodeposition of efficient binder-free NiO electrocatalysts for water oxidation 高效无粘结剂NiO水氧化电催化剂的可扩展阳极电沉积

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-01 Epub Date: 2026-01-13 DOI: 10.1016/j.jelechem.2026.119799

Zahra Kasipour Rasteh kenari , Ahmad Ahmadi Daryakenari , Arash Montazeri , Farshad Boorboor Ajdari , Mohammad Mahdi Kasipour

Developing high-performance, durable, and cost-effective electrocatalysts for the oxygen evolution reaction (OER) is pivotal for green hydrogen generation. In this research, the elctrocatalysts of the NiO nanostructures are directly electrodeposited onto a graphite substrate through a facile and binder-free anodic strategy. It was found that the applied deposition potential is a powerful electrochemical parameter to control the morphology, defect density, and the OER efficiency of the obtained NiO layers. The electrodeposition process, when performed at an optimized potential of 2.0 V, fabricates very tiny NiO nanoparticles that possess a high density of oxygen vacancies. This electrode fabricated at 2.0 V exhibits a proper OER activity in alkaline media, acquiring a high current density of 324 mA·cm⁻² at 1.8 V vs. RHE. After 24-h stability testing, the NiO-2 V electrode maintained a current density of ∼200 mA/cm² at 1.65 V vs. RHE, significantly outperforming the NiO-1 V electrode, which stabilized at only ∼10 mA/cm².

开发高性能、耐用、高性价比的析氧反应电催化剂是实现绿色制氢的关键。在本研究中，通过简单且无粘结剂的阳极策略，将NiO纳米结构的电催化剂直接电沉积在石墨衬底上。结果表明，沉积电位是控制NiO镀层形貌、缺陷密度和OER效率的重要电化学参数。当电沉积过程在2.0 V的优化电位下进行时，可以制造出具有高密度氧空位的非常微小的NiO纳米颗粒。在2.0 V下制备的电极在碱性介质中表现出适当的OER活性，在1.8 V下获得324 mA·cm−2的高电流密度。经过24小时的稳定性测试，NiO-2 V电极在1.65 V时与RHE相比保持了约200 mA/cm2的电流密度，显著优于NiO-1 V电极，后者稳定在约10 mA/cm2。

{"title":"Scalable anodic electrodeposition of efficient binder-free NiO electrocatalysts for water oxidation","authors":"Zahra Kasipour Rasteh kenari , Ahmad Ahmadi Daryakenari , Arash Montazeri , Farshad Boorboor Ajdari , Mohammad Mahdi Kasipour","doi":"10.1016/j.jelechem.2026.119799","DOIUrl":"10.1016/j.jelechem.2026.119799","url":null,"abstract":"<div><div>Developing high-performance, durable, and cost-effective electrocatalysts for the oxygen evolution reaction (OER) is pivotal for green hydrogen generation. In this research, the elctrocatalysts of the NiO nanostructures are directly electrodeposited onto a graphite substrate through a facile and binder-free anodic strategy. It was found that the applied deposition potential is a powerful electrochemical parameter to control the morphology, defect density, and the OER efficiency of the obtained NiO layers. The electrodeposition process, when performed at an optimized potential of 2.0 V, fabricates very tiny NiO nanoparticles that possess a high density of oxygen vacancies. This electrode fabricated at 2.0 V exhibits a proper OER activity in alkaline media, acquiring a high current density of 324 mA·cm<sup>−2</sup> at 1.8 V vs. RHE. After 24-h stability testing, the NiO-2 V electrode maintained a current density of ∼200 mA/cm<sup>2</sup> at 1.65 V vs. RHE, significantly outperforming the NiO-1 V electrode, which stabilized at only ∼10 mA/cm<sup>2</sup>.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119799"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploration of Zn2+/Co2+ cation at tetrahedral sites in spinel manganites as a battery-type electrode for prospective application in supercapattery 尖晶石锰矿四面体上Zn2+/Co2+阳离子作为电池型电极在超级电池中的应用前景

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-01 Epub Date: 2026-01-22 DOI: 10.1016/j.jelechem.2026.119871

Steffy Backianathan, Jeyabharathi Arockiasamy, Sutharthani Kannan, Suba Devi Rengapillai, Sivakumar Marimuthu

The trait of spinel manganites with cation substitution at tetrahedral sites was deliberately analyzed in the application panorama for future high-power energy storage systems. ZnMn₂O₄ and CoMn₂O₄ were synthesized via sol-gel method and followed by thermal treatment. The divalent Zn and multivalent Co cation substitution at tetrahedral localities significantly affect the electrochemical performance of spinel manganites. The grades of electrochemical tests determine that ZnMn₂O₄ and CoMn₂O₄ were categorized as the typical battery-grade electrode material. ZnMn₂O₄ reveals an enhanced specific capacity may due to the extension of diffusion channels, which paves a way for insertion/extraction of ions at the solid electrolyte interphase and the synergy between the zinc and manganese cations. The electroactive material ZnMn₂O₄ exhibits a specific capacity of 232 C g⁻¹ at a current density of 1 A g⁻¹ and a cyclic durability test was carried out to discern the capacity retention of 81.4% even after 5000 cycles. Fabricated asymmetric hybrid device unveils an energy density of 51.5 Wh Kg⁻¹ with a power density of 1123 W Kg⁻¹. Thus, the spinel Zinc manganite shows extensive electrochemical characteristics for high-performance energy storage system.

分析了四面体阳离子取代尖晶石锰酸盐的特性，展望了其在未来大功率储能系统中的应用前景。采用溶胶-凝胶法制备了ZnMn2O4和CoMn2O4，并对其进行了热处理。在四面体位置的二价Zn和多价Co阳离子取代对尖晶石锰矿的电化学性能有显著影响。电化学等级测试确定ZnMn2O4和CoMn2O4为典型的电池级电极材料。ZnMn2O4的比容量增强可能是由于扩散通道的扩展，这为离子在固体电解质界面的插入/提取以及锌锰阳离子之间的协同作用铺平了道路。电活性材料ZnMn2O4在电流密度为1 a g−1时的比容量为232 C g−1，循环耐久性测试表明，即使在5000次循环后，其容量保持率仍为81.4%。制备的非对称混合器件的能量密度为51.5 Wh Kg−1，功率密度为1123 W Kg−1。因此，尖晶石锌锰矿具有广泛的电化学特性，可用于高性能储能系统。

{"title":"Exploration of Zn2+/Co2+ cation at tetrahedral sites in spinel manganites as a battery-type electrode for prospective application in supercapattery","authors":"Steffy Backianathan, Jeyabharathi Arockiasamy, Sutharthani Kannan, Suba Devi Rengapillai, Sivakumar Marimuthu","doi":"10.1016/j.jelechem.2026.119871","DOIUrl":"10.1016/j.jelechem.2026.119871","url":null,"abstract":"<div><div>The trait of spinel manganites with cation substitution at tetrahedral sites was deliberately analyzed in the application panorama for future high-power energy storage systems. ZnMn<sub>2</sub>O<sub>4</sub> and CoMn<sub>2</sub>O<sub>4</sub> were synthesized via sol-gel method and followed by thermal treatment. The divalent Zn and multivalent Co cation substitution at tetrahedral localities significantly affect the electrochemical performance of spinel manganites. The grades of electrochemical tests determine that ZnMn<sub>2</sub>O<sub>4</sub> and CoMn<sub>2</sub>O<sub>4</sub> were categorized as the typical battery-grade electrode material. ZnMn<sub>2</sub>O<sub>4</sub> reveals an enhanced specific capacity may due to the extension of diffusion channels, which paves a way for insertion/extraction of ions at the solid electrolyte interphase and the synergy between the zinc and manganese cations. The electroactive material ZnMn<sub>2</sub>O<sub>4</sub> exhibits a specific capacity of 232 C g<sup>−1</sup> at a current density of 1 A g<sup>−1</sup> and a cyclic durability test was carried out to discern the capacity retention of 81.4% even after 5000 cycles. Fabricated asymmetric hybrid device unveils an energy density of 51.5 Wh Kg<sup>−1</sup> with a power density of 1123 W Kg<sup>−1</sup>. Thus, the spinel Zinc manganite shows extensive electrochemical characteristics for high-performance energy storage system.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119871"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Suppression of lithium deposition on negative electrode by blending hard carbon with graphite 硬碳与石墨共混抑制负极锂沉积

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-01 Epub Date: 2026-01-22 DOI: 10.1016/j.jelechem.2026.119842

Yusuke Okumura , Hikaru Kobayashi , Toshihiro Koga , Mikito Suto , Koji Nakabayashi , Seong-Ho Yoon , Jin Miyawaki

Graphite is widely used as the active material of negative electrodes for lithium (Li)-ion batteries. Graphite electrodes have high energy density and good initial cycle efficiency, but their cycle property is inferior to that of hard carbon under severe conditions such as high charge rates and low temperatures. Under these conditions, graphite electrodes are susceptible to deposition of metallic Li on the electrode surface (Li plating). In this study, hard carbon was blended with graphite and the cycle properties of blended graphite negative electrodes under severe conditions were evaluated, and the mechanism of improvement of electrochemical property was investigated. Addition of hard carbon to graphite negative electrodes improved capacity retention at low temperatures and under high charge rates. No significant differences were observed in the discharge capacity, initial Coulombic efficiency, energy density, or resistance as a result of hard carbon addition within the range of addition in this study (up to 10 wt%). In-situ X-ray diffraction analysis revealed that graphite and hard carbon were lithiated homogeneously in the early stage of charging, and graphite was lithiated preferentially in the middle stage. At the end of charging, the graphite was Li-saturated, and the hard carbon acted as a buffer space for storage of excess Li from the saturated graphite. This buffer function is thought to be the reason for the good cycle performance of the blended electrodes.

石墨作为锂离子电池负极的活性材料被广泛应用。石墨电极具有较高的能量密度和良好的初始循环效率，但在高电荷率和低温等恶劣条件下，其循环性能不如硬碳电极。在这些条件下，石墨电极容易在电极表面沉积金属锂（镀锂）。本研究将硬质碳与石墨混合，在恶劣条件下对混合石墨负极的循环性能进行了评价，并对其电化学性能的改善机理进行了探讨。在石墨负极中添加硬碳可以提高在低温和高充电速率下的容量保持率。在本研究的添加范围内（高达10 wt%），在放电容量、初始库仑效率、能量密度或电阻方面没有观察到显著差异。原位x射线衍射分析表明，石墨和硬碳在充电初期均质锂化，而石墨在充电中期优先锂化。在充电结束时，石墨是锂饱和的，硬碳作为缓冲空间，用于存储饱和石墨中多余的锂。这种缓冲功能被认为是混合电极具有良好循环性能的原因。

{"title":"Suppression of lithium deposition on negative electrode by blending hard carbon with graphite","authors":"Yusuke Okumura , Hikaru Kobayashi , Toshihiro Koga , Mikito Suto , Koji Nakabayashi , Seong-Ho Yoon , Jin Miyawaki","doi":"10.1016/j.jelechem.2026.119842","DOIUrl":"10.1016/j.jelechem.2026.119842","url":null,"abstract":"<div><div>Graphite is widely used as the active material of negative electrodes for lithium (Li)-ion batteries. Graphite electrodes have high energy density and good initial cycle efficiency, but their cycle property is inferior to that of hard carbon under severe conditions such as high charge rates and low temperatures. Under these conditions, graphite electrodes are susceptible to deposition of metallic Li on the electrode surface (Li plating). In this study, hard carbon was blended with graphite and the cycle properties of blended graphite negative electrodes under severe conditions were evaluated, and the mechanism of improvement of electrochemical property was investigated. Addition of hard carbon to graphite negative electrodes improved capacity retention at low temperatures and under high charge rates. No significant differences were observed in the discharge capacity, initial Coulombic efficiency, energy density, or resistance as a result of hard carbon addition within the range of addition in this study (up to 10 wt%). <em>In-situ</em> X-ray diffraction analysis revealed that graphite and hard carbon were lithiated homogeneously in the early stage of charging, and graphite was lithiated preferentially in the middle stage. At the end of charging, the graphite was Li-saturated, and the hard carbon acted as a buffer space for storage of excess Li from the saturated graphite. This buffer function is thought to be the reason for the good cycle performance of the blended electrodes.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119842"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis and electrochemical investigation of cobalt-free high-nickel quaternary LiNi0.9Fe0.03Mn0.04Mg0.03O2 cathodes 无钴高镍季系lini0.9 fe0.03 mn0.04 mg0.030 o2阴极的合成及电化学研究

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-01 Epub Date: 2026-01-27 DOI: 10.1016/j.jelechem.2026.119879

Jiatai Wang , Yuanyuan Li , Chao Fan , Jiting Li , Xi Wen , Xiaohong Ma , Jian Li

Cobalt-free high‑nickel layered oxides are promising cathode materials for lithium-ion batteries (LIBs) due to their high capacity and cost-effectiveness. Nevertheless, high‑nickel materials suffer from intrinsic challenges including severe Li/Ni cation mixing, harmful H2-H3 phase transitions, and structural degradation, which result in capacity fading and poor rate performance. In this work, the quaternary LiNi_0.9Fe_0.03Mn_0.04Mg_0.03O₂ (NFMM) cathodes were synthesized via homogeneous co-precipitation followed by high-temperature solid-state method. X-ray diffraction analysis confirmed well-ordered layered structures with I(0 0 3)/I(1 0 4) ratios of 1.28, 1.73, and 1.46 for samples calcined at 700 °C, 725 °C, and 750 °C, respectively. All samples delivered high initial discharge capacities of 191.53, 193.27, and 186.30 mAh g⁻¹ at 0.1C, maintaining 86.58%, 91.97%, and 89.21% capacity retention after 100 cycles at 0.2C. The materials showed good rate capability with discharge capacities of 91.46, 97.15, and 85.32 mAh g⁻¹ at 5.0C. These results demonstrate that the NFMM quaternary composition exhibits favorable electrochemical performance, contributing to the development of cobalt-free cathode materials for lithium-ion batteries.

无钴高镍层状氧化物因其高容量和高性价比而成为锂离子电池极具前景的正极材料。然而，高镍材料面临着固有的挑战，包括严重的Li/Ni阳离子混合，有害的H2-H3相变和结构降解，导致容量衰退和速率性能差。本文采用高温固相法，采用均匀共沉淀法合成了第四系lini0.9 fe0.03 mn0.04 mg0.030 o2 （NFMM）阴极。x射线衍射分析证实，在700°C、725°C和750°C煅烧的样品，层状结构有序，I(0 0 3)/I（1 0 4）比值分别为1.28、1.73和1.46。在0.1C下，所有样品的初始放电容量分别为191.53、193.27和186.30 mAh g - 1，在0.2C下循环100次后，容量保持率分别为86.58%、91.97%和89.21%。在5.0℃下，材料的放电容量分别为91.46、97.15和85.32 mAh g−1。这些结果表明，NFMM四元化合物具有良好的电化学性能，有助于锂离子电池无钴正极材料的发展。

{"title":"Synthesis and electrochemical investigation of cobalt-free high-nickel quaternary LiNi0.9Fe0.03Mn0.04Mg0.03O2 cathodes","authors":"Jiatai Wang , Yuanyuan Li , Chao Fan , Jiting Li , Xi Wen , Xiaohong Ma , Jian Li","doi":"10.1016/j.jelechem.2026.119879","DOIUrl":"10.1016/j.jelechem.2026.119879","url":null,"abstract":"<div><div>Cobalt-free high‑nickel layered oxides are promising cathode materials for lithium-ion batteries (LIBs) due to their high capacity and cost-effectiveness. Nevertheless, high‑nickel materials suffer from intrinsic challenges including severe Li/Ni cation mixing, harmful H2-H3 phase transitions, and structural degradation, which result in capacity fading and poor rate performance. In this work, the quaternary LiNi<sub>0.9</sub>Fe<sub>0.03</sub>Mn<sub>0.04</sub>Mg<sub>0.03</sub>O<sub>2</sub> (NFMM) cathodes were synthesized via homogeneous co-precipitation followed by high-temperature solid-state method. X-ray diffraction analysis confirmed well-ordered layered structures with <em>I</em>(0 0 3)<em>/I</em>(1 0 4) ratios of 1.28, 1.73, and 1.46 for samples calcined at 700 °C, 725 °C, and 750 °C, respectively. All samples delivered high initial discharge capacities of 191.53, 193.27, and 186.30 mAh g<sup>−1</sup> at 0.1C, maintaining 86.58%, 91.97%, and 89.21% capacity retention after 100 cycles at 0.2C. The materials showed good rate capability with discharge capacities of 91.46, 97.15, and 85.32 mAh g<sup>−1</sup> at 5.0C. These results demonstrate that the NFMM quaternary composition exhibits favorable electrochemical performance, contributing to the development of cobalt-free cathode materials for lithium-ion batteries.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119879"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic K+ intercalation and PVP modification: boosting V2O5 cathode performance for aqueous zinc-ion batteries 协同K+插层和PVP改性：提高水性锌离子电池V2O5阴极性能

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-01 Epub Date: 2026-01-29 DOI: 10.1016/j.jelechem.2026.119892

Zihang Zhou , Zhi Chen , Suwen Lai , Hongkun Lu , Juntong Huang , Huiyong Yang , Xiaofeng Chen , Qi Sun , Hui Zhou , Wentao Qian

With their inherent safety, cost-effective, and environmental sustainability, aqueous zinc-ion batteries (AZIBs) represent a highly promising technology for future energy storage. Vanadium-based oxides hold great application potential owing to their abundant tunnel structures and high electrode potentials. However, the primary limitations of vanadium-based oxides lie in their poor electrical conductivity and poor cycling stability. Therefore, advancing AZIBs requires cathode materials that can achieve high-capacity Zn²⁺ storage while ensuring long-term structural stability. This study successfully prepared PKVOH with stacked nanosheets by K⁺ intercalation and PVP coating modification of V₂O₅ via hydrothermal reaction. The supporting role of K⁺ mitigates rapid collapse of the vanadium-based material, while PVP modification engineers a favorable morphology with high specific surface area, thereby directly creating additional electrochemically active sites. Outstanding cycling stability is achieved with the PKVOH electrode, achieving a specific capacity as high as 356 mAh g⁻¹ at 0.1 A g⁻¹. Remarkably, A capacity of 188 mAh g⁻¹ is retained after 4000 cycles at 5 A g⁻¹. Complementarily, the Zn²⁺ storage mechanism was probed using ex-situ XRD analysis, providing new insights into enhancing the ion-doping performance of vanadium-based materials.

由于其固有的安全性、成本效益和环境可持续性，水性锌离子电池（azib）代表了一种非常有前途的未来储能技术。钒基氧化物具有丰富的隧道结构和较高的电极电位，具有很大的应用潜力。然而，钒基氧化物的主要局限性在于其导电性差和循环稳定性差。因此，推进azib需要能够在保证长期结构稳定性的同时实现高容量Zn2+存储的正极材料。本研究通过K+插层和水热反应对V2O5进行PVP涂层改性，成功制备了堆叠纳米片的PKVOH。K+的支持作用减轻了钒基材料的快速坍塌，而PVP改性工程具有高比表面积的有利形貌，从而直接产生额外的电化学活性位点。PKVOH电极实现了出色的循环稳定性，在0.1 a g−1时实现高达356 mAh g−1的比容量。值得注意的是，在5a g−1下循环4000次后，容量仍保持在188 mAh g−1。此外，利用非原位XRD分析探讨了Zn2+的储存机理，为提高钒基材料的离子掺杂性能提供了新的见解。

{"title":"Synergistic K+ intercalation and PVP modification: boosting V2O5 cathode performance for aqueous zinc-ion batteries","authors":"Zihang Zhou , Zhi Chen , Suwen Lai , Hongkun Lu , Juntong Huang , Huiyong Yang , Xiaofeng Chen , Qi Sun , Hui Zhou , Wentao Qian","doi":"10.1016/j.jelechem.2026.119892","DOIUrl":"10.1016/j.jelechem.2026.119892","url":null,"abstract":"<div><div>With their inherent safety, cost-effective, and environmental sustainability, aqueous zinc-ion batteries (AZIBs) represent a highly promising technology for future energy storage. Vanadium-based oxides hold great application potential owing to their abundant tunnel structures and high electrode potentials. However, the primary limitations of vanadium-based oxides lie in their poor electrical conductivity and poor cycling stability. Therefore, advancing AZIBs requires cathode materials that can achieve high-capacity Zn<sup>2+</sup> storage while ensuring long-term structural stability. This study successfully prepared PKVOH with stacked nanosheets by K<sup>+</sup> intercalation and PVP coating modification of V<sub>2</sub>O<sub>5</sub> via hydrothermal reaction. The supporting role of K<sup>+</sup> mitigates rapid collapse of the vanadium-based material, while PVP modification engineers a favorable morphology with high specific surface area, thereby directly creating additional electrochemically active sites. Outstanding cycling stability is achieved with the PKVOH electrode, achieving a specific capacity as high as 356 mAh g<sup>−1</sup> at 0.1 A g<sup>−1</sup>. Remarkably, A capacity of 188 mAh g<sup>−1</sup> is retained after 4000 cycles at 5 A g<sup>−1</sup>. Complementarily, the Zn<sup>2+</sup> storage mechanism was probed using ex-situ XRD analysis, providing new insights into enhancing the ion-doping performance of vanadium-based materials.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119892"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Label-free multi-aptamer DNA nanowire electrochemical sensor based on HCR for highly sensitive detection of ATP 基于HCR的无标记多适体DNA纳米线电化学传感器用于ATP的高灵敏度检测

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-01 Epub Date: 2026-01-29 DOI: 10.1016/j.jelechem.2026.119882

Xiaoyan He , Zhiqiang Wang , Yanling Liang , Jing Li , Yuanyuan Lu , Xin Tian

Adenosine triphosphate (ATP) plays an irreplaceable role as an energy donor in regulating cellular metabolism. When detecting ATP in complex samples, conventional single-adaptor sensors often suffer from low capture efficiency and poor sensitivity. This study synthesizes a substrate material combining multi-walled carbon nanotubes (MWCNTs) with gold nanoparticles (AuNPs), endowing it with both excellent conductivity and biocompatibility, thereby providing an ideal platform for subsequent sensor construction. By employing unlabeled multi-aptamer DNA nanowires synthesized via hybridization chain reaction (HCR) as the recognition element, the sensor's specific binding capacity for ATP in complex environments is significantly enhanced. Under optimized conditions, the sensor has a detection range of 0.1 pM to 1 μM with a detection limit as low as 0.04 pM. Moreover, the sensor demonstrated excellent reproducibility and selectivity toward ATP, enabling its successful application in accurately determining ATP levels in real serum samples. The recoveries were 97.40%–104.6% with relative standard deviations (RSDs) of 3.9%–4.6%, which demonstrated its strong ability to detect ATP and may provide valuable insights for the analysis of other small biomolecules.

三磷酸腺苷（Adenosine triphosphate， ATP）在调节细胞代谢中起着不可替代的能量供体作用。在检测复杂样品中的ATP时，传统的单接头传感器往往存在捕获效率低、灵敏度差的问题。本研究合成了一种结合多壁碳纳米管（MWCNTs）和金纳米颗粒（AuNPs）的基底材料，使其具有优异的导电性和生物相容性，从而为后续传感器的构建提供了理想的平台。采用杂交链反应（HCR）合成的未标记多适体DNA纳米线作为识别元件，显著增强了传感器在复杂环境下对ATP的特异结合能力。在优化条件下，传感器的检测范围为0.1 pM ~ 1 μM，检测限低至0.04 pM。此外，该传感器对ATP表现出优异的再现性和选择性，使其能够成功地应用于准确测定真实血清样品中的ATP水平。加样回收率为97.40% ~ 104.6%，相对标准偏差（rsd）为3.9% ~ 4.6%，具有较强的检测ATP的能力，为其他生物小分子的分析提供了有价值的参考。

{"title":"Label-free multi-aptamer DNA nanowire electrochemical sensor based on HCR for highly sensitive detection of ATP","authors":"Xiaoyan He , Zhiqiang Wang , Yanling Liang , Jing Li , Yuanyuan Lu , Xin Tian","doi":"10.1016/j.jelechem.2026.119882","DOIUrl":"10.1016/j.jelechem.2026.119882","url":null,"abstract":"<div><div>Adenosine triphosphate (ATP) plays an irreplaceable role as an energy donor in regulating cellular metabolism. When detecting ATP in complex samples, conventional single-adaptor sensors often suffer from low capture efficiency and poor sensitivity. This study synthesizes a substrate material combining multi-walled carbon nanotubes (MWCNTs) with gold nanoparticles (AuNPs), endowing it with both excellent conductivity and biocompatibility, thereby providing an ideal platform for subsequent sensor construction. By employing unlabeled multi-aptamer DNA nanowires synthesized via hybridization chain reaction (HCR) as the recognition element, the sensor's specific binding capacity for ATP in complex environments is significantly enhanced. Under optimized conditions, the sensor has a detection range of 0.1 pM to 1 μM with a detection limit as low as 0.04 pM. Moreover, the sensor demonstrated excellent reproducibility and selectivity toward ATP, enabling its successful application in accurately determining ATP levels in real serum samples. The recoveries were 97.40%–104.6% with relative standard deviations (RSDs) of 3.9%–4.6%, which demonstrated its strong ability to detect ATP and may provide valuable insights for the analysis of other small biomolecules.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119882"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic RuFe mixed oxide nanotubes with enriched oxygen vacancies for enhanced electrocatalytic oxidation of l-ascorbic acid 富氧空位协同RuFe混合氧化物纳米管增强l-抗坏血酸电催化氧化

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-03-15 Epub Date: 2026-01-20 DOI: 10.1016/j.jelechem.2026.119846

Chae Jung Park, Subin Choi, Youngmi Lee

RuFe mixed oxide (Ru_xFe_2−xO_y, x = 0.8, 1, 1.2) nanotubes were synthesized via electrospinning and thermal annealing, and benchmarked against single-component RuO₂ counterpart for l-ascorbic acid (AA) sensing. Physical characterization confirmed hollow nanotubular structures of Ru₁Fe₁O_y exhibiting the highest metallic Ru⁰ fraction and oxygen-vacancy content, features that correlate with reduced charge-transfer resistance. In physiological pH condition (PBS, pH 7.4), Ru₁Fe₁O_y delivered the most favorable analytical performance for AA oxidation, with superior sensitivity, the lowest detection limit, and the fastest response time. Unlike RuO₂, which showed gradual current decay during operation, Ru₁Fe₁O_y maintained stable amperometric responses during repeated AA injections and retained 97.2% of its initial sensitivity after 28 days. Differential pulse voltammetry further enabled simultaneous and selective detection of AA, dopamine, and uric acid. In real-sample assays of vitamin C tablets, Ru₁Fe₁O_y achieved near-quantitative recovery (∼100%), confirming high reliability. The synergy between Ru and Fe, a predominantly disordered (amorphous-like) structure and oxygen-vacancy enrichment, underpins the superior sensing properties. Supported by composition/thermal controls and a physical-mixture comparison, these results highlight RuFe nanotubes as cost-effective, high-performance platforms for selective AA detection in complex biological and food matrices.

通过静电纺丝和热退火法制备了RuFe混合氧化物（RuxFe2−xOy, x = 0.8, 1,1.2）纳米管，并与单组分RuO2纳米管进行了l-抗坏血酸（AA）传感的基准测试。物理表征证实了Ru1Fe1Oy的空心纳米管结构具有最高的金属Ru0分数和氧空位含量，这些特征与降低的电荷转移电阻有关。在生理pH条件下（PBS, pH 7.4）， Ru1Fe1Oy对AA氧化的分析性能最好，灵敏度高，检出限低，响应时间快。与RuO2在操作过程中逐渐衰减的电流不同，Ru1Fe1Oy在重复注射AA时保持稳定的安培响应，并在28天后保持了97.2%的初始灵敏度。差分脉冲伏安法进一步实现了AA、多巴胺和尿酸的同时和选择性检测。在维生素C片的实际样品分析中，Ru1Fe1Oy实现了近定量回收率（~ 100%），证实了高可靠性。钌和铁之间的协同作用，主要是无序（无定形）结构和氧空位富集，支撑了优越的传感性能。在组成/热控制和物理混合物比较的支持下，这些结果突出了RuFe纳米管作为复杂生物和食品基质中选择性AA检测的经济高效的高性能平台。

{"title":"Synergistic RuFe mixed oxide nanotubes with enriched oxygen vacancies for enhanced electrocatalytic oxidation of l-ascorbic acid","authors":"Chae Jung Park, Subin Choi, Youngmi Lee","doi":"10.1016/j.jelechem.2026.119846","DOIUrl":"10.1016/j.jelechem.2026.119846","url":null,"abstract":"<div><div>Ru<img>Fe mixed oxide (Ru<sub><em>x</em></sub>Fe<sub>2−<em>x</em></sub>O<sub><em>y</em></sub>, <em>x</em> = 0.8, 1, 1.2) nanotubes were synthesized via electrospinning and thermal annealing, and benchmarked against single-component RuO<sub>2</sub> counterpart for <span>l</span>-ascorbic acid (AA) sensing. Physical characterization confirmed hollow nanotubular structures of Ru<sub>1</sub>Fe<sub>1</sub>O<sub><em>y</em></sub> exhibiting the highest metallic Ru<sup>0</sup> fraction and oxygen-vacancy content, features that correlate with reduced charge-transfer resistance. In physiological pH condition (PBS, pH 7.4), Ru<sub>1</sub>Fe<sub>1</sub>O<sub><em>y</em></sub> delivered the most favorable analytical performance for AA oxidation, with superior sensitivity, the lowest detection limit, and the fastest response time. Unlike RuO<sub>2</sub>, which showed gradual current decay during operation, Ru<sub>1</sub>Fe<sub>1</sub>O<sub><em>y</em></sub> maintained stable amperometric responses during repeated AA injections and retained 97.2% of its initial sensitivity after 28 days. Differential pulse voltammetry further enabled simultaneous and selective detection of AA, dopamine, and uric acid. In real-sample assays of vitamin C tablets, Ru<sub>1</sub>Fe<sub>1</sub>O<sub><em>y</em></sub> achieved near-quantitative recovery (∼100%), confirming high reliability. The synergy between Ru and Fe, a predominantly disordered (amorphous-like) structure and oxygen-vacancy enrichment, underpins the superior sensing properties. Supported by composition/thermal controls and a physical-mixture comparison, these results highlight Ru<img>Fe nanotubes as cost-effective, high-performance platforms for selective AA detection in complex biological and food matrices.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119846"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrolyte-induced electronic activation and interfacial blocking of cefuroxime: An optical and impedance study 电解质诱导的头孢呋辛的电子激活和界面阻断：光学和阻抗研究

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-03-15 Epub Date: 2026-01-20 DOI: 10.1016/j.jelechem.2026.119850

M.A. Radoi , B. Tutunaru

The electrochemical reactivity of antibiotic pollutants is commonly discussed in terms of either molecular electronic activation or interfacial electrochemical kinetics, yet these two aspects are rarely evaluated simultaneously. Here, we provide a combined optical–electrochemical analysis that reveals a previously overlooked decoupling between optical-gap modulation and interfacial charge-transfer behavior. Using cefuroxime (CFRX) as a model β-lactam antibiotic, we systematically investigate the effect of halide supporting electrolytes (NaF, NaCl, NaBr) on molecular electronic structure and electrode–solution interface properties under acidic, neutral, and alkaline conditions. UV–Vis spectroscopy combined with Tauc analysis demonstrates electrolyte- and pH-dependent optical-gap narrowing, with bromide inducing the strongest electronic activation. In contrast, electrochemical impedance spectroscopy shows that the same conditions lead to increased charge-transfer resistance and reduced double-layer capacitance due to enhanced adsorption and interfacial blocking effects. By directly correlating optical activation with impedance-derived interfacial parameters, this study establishes that optical-gap reduction is not a direct indicator of interfacial charge-transfer behavior governing electrochemical reactivity. The findings highlight electrolyte-induced interfacial accessibility as a critical, yet often overlooked, factor in electrochemical water treatment and provide mechanistic insight into interfacial processes relevant to reactivity prediction rather than direct measurements of degradation rates.

抗生素污染物的电化学反应性通常从分子电子活化或界面电化学动力学两方面进行讨论，但很少同时对这两方面进行评价。在这里，我们提供了一个联合的光学电化学分析，揭示了以前被忽视的光隙调制和界面电荷转移行为之间的解耦。以头孢呋辛（CFRX）为模型β-内酰胺类抗生素，系统研究了在酸性、中性和碱性条件下，卤化物载体电解质（NaF、NaCl、NaBr）对其分子电子结构和电极-溶液界面性质的影响。UV-Vis光谱结合Tauc分析表明，电解质和ph依赖于光隙缩小，溴化物诱导最强的电子激活。相反，电化学阻抗谱分析表明，由于吸附和界面阻塞效应增强，相同的条件导致电荷转移电阻增加，双层电容降低。通过直接将光学活化与阻抗衍生的界面参数相关联，本研究确定了光学间隙减小并不是控制电化学反应性的界面电荷转移行为的直接指标。研究结果强调了电解质诱导的界面可达性是电化学水处理中一个关键但经常被忽视的因素，并提供了与反应性预测相关的界面过程的机理见解，而不是直接测量降解率。

{"title":"Electrolyte-induced electronic activation and interfacial blocking of cefuroxime: An optical and impedance study","authors":"M.A. Radoi , B. Tutunaru","doi":"10.1016/j.jelechem.2026.119850","DOIUrl":"10.1016/j.jelechem.2026.119850","url":null,"abstract":"<div><div>The electrochemical reactivity of antibiotic pollutants is commonly discussed in terms of either molecular electronic activation or interfacial electrochemical kinetics, yet these two aspects are rarely evaluated simultaneously. Here, we provide a combined optical–electrochemical analysis that reveals a previously overlooked decoupling between optical-gap modulation and interfacial charge-transfer behavior. Using cefuroxime (CFRX) as a model β-lactam antibiotic, we systematically investigate the effect of halide supporting electrolytes (NaF, NaCl, NaBr) on molecular electronic structure and electrode–solution interface properties under acidic, neutral, and alkaline conditions. UV–Vis spectroscopy combined with Tauc analysis demonstrates electrolyte- and pH-dependent optical-gap narrowing, with bromide inducing the strongest electronic activation. In contrast, electrochemical impedance spectroscopy shows that the same conditions lead to increased charge-transfer resistance and reduced double-layer capacitance due to enhanced adsorption and interfacial blocking effects. By directly correlating optical activation with impedance-derived interfacial parameters, this study establishes that optical-gap reduction is not a direct indicator of interfacial charge-transfer behavior governing electrochemical reactivity. The findings highlight electrolyte-induced interfacial accessibility as a critical, yet often overlooked, factor in electrochemical water treatment and provide mechanistic insight into interfacial processes relevant to reactivity prediction rather than direct measurements of degradation rates.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119850"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Micromagnet-loaded bipolar plate design for vanadium redox flow batteries: Improved mass transport and electrochemical performance 钒氧化还原液流电池的微磁负载双极板设计：改善质量传递和电化学性能

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-03-15 Epub Date: 2026-01-19 DOI: 10.1016/j.jelechem.2026.119835

Yu Tian , Hongbo Liu , Jiaqi Wan , Shuo Tang , Kang cen , Qiang li , Sibo Fu

The Vanadium Redox Flow Battery (VRFB) holds significant promise for large-scale energy storage applications due to its high safety, long cycle life, and favorable environmental characteristics. However, VRFBs face challenges at high current density, such as concentration polarization and electrochemical kinetic hysteresis, which limit their energy conversion efficiency and power density. To alleviate these limitations, this paper proposes an innovative bipolar plate (BPP) design. By integrating micromagnets onto the BPP, the magnetohydrodynamic (MHD) effect enhances the electrolyte's mass transfer process. Using a multi-physics field-coupled numerical simulation approach, this study systematically investigates the impact of the micromagnet-loaded BPP structure on ion transport and electrochemical performance. The results demonstrate that the micromagnet-loaded design optimizes electrolyte flow distribution, improves ion transport pathways, mitigates concentration polarization, and enhances electrochemical reaction efficiency at the electrode, thereby significantly improving battery performance. This paper presents a novel design approach for enhancing the energy efficiency of VRFBs, particularly in terms of achieving high power density and effective energy conversion.

钒氧化还原液流电池（VRFB）由于其高安全性、长循环寿命和良好的环境特性，在大规模储能应用中具有重要的前景。然而，vrfb在高电流密度下面临浓度极化和电化学动力学滞后等挑战，限制了其能量转换效率和功率密度。为了减轻这些限制，本文提出了一种创新的双极板（BPP）设计。通过将微磁体集成到BPP上，磁流体动力学（MHD）效应增强了电解质的传质过程。本研究采用多物理场耦合数值模拟方法，系统地研究了微磁负载BPP结构对离子输运和电化学性能的影响。结果表明，微磁体负载设计优化了电解质流动分布，改善了离子传递途径，减轻了浓度极化，提高了电极处的电化学反应效率，从而显著提高了电池性能。本文提出了一种新的设计方法来提高vrfb的能量效率，特别是在实现高功率密度和有效的能量转换方面。

{"title":"Micromagnet-loaded bipolar plate design for vanadium redox flow batteries: Improved mass transport and electrochemical performance","authors":"Yu Tian , Hongbo Liu , Jiaqi Wan , Shuo Tang , Kang cen , Qiang li , Sibo Fu","doi":"10.1016/j.jelechem.2026.119835","DOIUrl":"10.1016/j.jelechem.2026.119835","url":null,"abstract":"<div><div>The Vanadium Redox Flow Battery (VRFB) holds significant promise for large-scale energy storage applications due to its high safety, long cycle life, and favorable environmental characteristics. However, VRFBs face challenges at high current density, such as concentration polarization and electrochemical kinetic hysteresis, which limit their energy conversion efficiency and power density. To alleviate these limitations, this paper proposes an innovative bipolar plate (BPP) design. By integrating micromagnets onto the BPP, the magnetohydrodynamic (MHD) effect enhances the electrolyte's mass transfer process. Using a multi-physics field-coupled numerical simulation approach, this study systematically investigates the impact of the micromagnet-loaded BPP structure on ion transport and electrochemical performance. The results demonstrate that the micromagnet-loaded design optimizes electrolyte flow distribution, improves ion transport pathways, mitigates concentration polarization, and enhances electrochemical reaction efficiency at the electrode, thereby significantly improving battery performance. This paper presents a novel design approach for enhancing the energy efficiency of VRFBs, particularly in terms of achieving high power density and effective energy conversion.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119835"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0