Journal of Electroanalytical Chemistry最新文献

{"title":"Enhancing safety and electrochemical performance of lithium-ion batteries with P/N-IL@NH2-UIO-66 functionalized PVDF separators","authors":"Hua Yu ,&nbsp;Xuan Wang ,&nbsp;Lijun Yang ,&nbsp;Qirui Wu ,&nbsp;Houming Shen ,&nbsp;Geming Wang ,&nbsp;Peng Fan","doi":"10.1016/j.jelechem.2025.119498","DOIUrl":"10.1016/j.jelechem.2025.119498","url":null,"abstract":"<div><div>The development of high-performance separator materials has become crucial with the ever-increasing demands for enhanced safety and energy density of lithium-ion batteries in electric vehicles and large-scale energy storage systems. Here, a novel high-safety functionalized separator was prepared by synthesizing a composite material that encapsulates phosphorus‑nitrogen-containing ionic liquid (P/N-IL) within NH₂-UIO-66-Zr metal-organic framework (MOF), and then combining this composite with a polyvinylidene fluoride (PVDF) P/N-IL@NH₂-UIO-66/PVDF separator. This functionalized P/N-IL@NH₂-UIO-66/PVDF separator significantly improves the flame-retardant performance of NCM811 batteries, effectively mitigating the risks of electrolyte combustion and explosion. Meanwhile, the porous structure of P/N-IL@NH₂-UIO-66 material optimizes the Li⁺ transport pathways, resulting in an increase in the ionic conductivity of NCM811 battery o 3.1 × 10⁻⁴ S/cm (compared to only 3.4 × 10⁻⁶ S/cm for the pure PVDF separator). The Li⁺ transference number is also elevated to 0.68. Moreover, after 600 cycles at a 1C current density, the capacity retention rate reaches as high as 71 %, with an average coulombic efficiency of 96 %, substantially enhancing the electrochemical performance and cycling stability of the battery. This work offers a novel technological pathway for the development of high-safety, high-performance lithium-ion batteries, as well as for the application of ionic liquids and MOFs.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"997 ","pages":"Article 119498"},"PeriodicalIF":4.1,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217480","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}

{"title":"Selective Ammonia Electrooxidation on TiB₄ and VB₄ quantum dots: Theoretical insights into catalytic activity and OER suppression","authors":"Hazem Abdelsalam ,&nbsp;Mohamed Abdel Rafea ,&nbsp;Mahmoud A.S. Sakr ,&nbsp;Nahed H. Teleb ,&nbsp;Magdi E.A. Zaki ,&nbsp;Omar H. Abd-Elkader ,&nbsp;Qinfang Zhang","doi":"10.1016/j.jelechem.2025.119492","DOIUrl":"10.1016/j.jelechem.2025.119492","url":null,"abstract":"<div><div>Ammonia (NH₃) has emerged as a promising carbon-free hydrogen carrier for sustainable energy applications. However, the development of cost-effective and efficient electrocatalysts for the ammonia oxidation reaction (AOR) remains a significant challenge. In this work, we employ density functional theory (DFT) calculations to investigate the structural stability, electronic properties, and catalytic performance of TiB₄ and VB₄ quantum dots (QDs) toward AOR. Structural optimizations, Mulliken charge analysis, and binding energy assessments confirm the thermodynamic stability of both QDs, with TiB₄ exhibiting slightly higher stability. Adsorption energy analysis reveals a strong affinity of both QDs for NH₃, with preferential binding at the transition metal centers. Reaction mechanisms were explored through both the Oswin–Salomon (O<img>S) and Gerischer–Mauerer (G–M) pathways, and corresponding free energy diagrams highlight TiB₄–S1 as the most promising active site. It exhibits remarkably low overpotentials of 0.084 V and 0.655 V for the O<img>S and G–M mechanisms, respectively—outperforming benchmark noble-metal catalysts such as Pt(100) and Fe/Pt(100). In contrast, VB₄ QDs suffer from high energy barriers and less favourable reaction energetics. Furthermore, comparative analysis with the competing oxygen evolution reaction (OER) confirms that TiB₄ QDs exhibit superior selectivity for AOR under anodic conditions. These findings position TiB₄ QDs as highly efficient, non-noble metal-based electrocatalysts for AOR, offering great potential for integration into next-generation fuel cells and green hydrogen technologies.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"997 ","pages":"Article 119492"},"PeriodicalIF":4.1,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155196","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}

{"title":"Enhanced electrochemical performance and cycling stability of cadmium-doped copper vanadate electrodes for supercapacitor applications","authors":"G. Gowrisankar ,&nbsp;R. Mariappan ,&nbsp;R. Bakkiyaraj ,&nbsp;A. Karthikeyan","doi":"10.1016/j.jelechem.2025.119483","DOIUrl":"10.1016/j.jelechem.2025.119483","url":null,"abstract":"<div><div>Supercapacitors are promising energy storage devices owing to their high power density, rapid charge–discharge capability, and long cycle life. However, the moderate cycling stability of copper vanadate electrodes limits their practical application. In this work, cadmium-doped copper vanadate nanostructures are synthesized via a cost-effective co-precipitation method with varying Cd contents (1 %, 3 %, 5 %, and 7 %). Structural and morphological studies confirm the successful incorporation of Cd, which modifies the crystallite size, lattice strain, and surface features. Electrochemical analyses (CV, GCD, and EIS) demonstrate that Cd doping significantly enhances charge storage and charge transfer kinetics. Among all samples, the 5 % Cd-doped electrode exhibits the highest specific capacitance of 576 F/g at 5 mV/s and superior stability with 92.2 % retention after 3000 cycles. These findings highlight cadmium doping as an effective strategy to improve the pseudocapacitive behavior and long-term performance of copper vanadate electrodes, making them attractive candidates for next-generation supercapacitor applications.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"997 ","pages":"Article 119483"},"PeriodicalIF":4.1,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155197","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}

{"title":"Bifunctional electrocatalysts based on nano-fan-shaped NiCoP for hydrogen evolution and urea oxidation reactions","authors":"Jiefei Li ,&nbsp;Xianrong Meng ,&nbsp;Zehao Zhang ,&nbsp;Mingyang Song ,&nbsp;He Zeng","doi":"10.1016/j.jelechem.2025.119489","DOIUrl":"10.1016/j.jelechem.2025.119489","url":null,"abstract":"<div><div>Replacing the conventional oxygen evolution reaction (OER) with the urea oxidation reaction (UOR) coupled with hydrogen evolution reaction (HER) represents a highly promising strategy for low-energy hydrogen production. In this study, we developed a novel nanosheet-assembled fan-shaped NiCoP electrocatalyst via a two-step hydrothermal-phosphidation method. Benefiting from its unique electronic structure and abundant active sites, the NiCoP catalyst requires only 1.12 V (vs. RHE) for UOR and an overpotential of 70 mV for HER to reach a current density of 10 mA·cm⁻². Remarkably, no obvious degradation in activity was observed even after 50 h of continuous operation. Moreover, when employed in a urea-assisted electrolyzer (HER||UOR), the catalyst achieves 10 mA·cm⁻² at a cell voltage of merely 1.37 V. This work provides new insights into the development of low-cost and energy-efficient urea electrolysis for hydrogen production.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"997 ","pages":"Article 119489"},"PeriodicalIF":4.1,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155249","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}

{"title":"Development of a concentration cell-based method for nanoparticle characterization","authors":"Saeka Sakashita ,&nbsp;Noriko Yamauchi ,&nbsp;Yuta Harada ,&nbsp;Hiroshi Okura ,&nbsp;Yoshio Kobayashi","doi":"10.1016/j.jelechem.2025.119491","DOIUrl":"10.1016/j.jelechem.2025.119491","url":null,"abstract":"<div><div>This study introduces an innovative particle measurement device utilizing a concentration cell, which comprises two half-cells separated by a track-etched polycarbonate membrane with 100 nm pores, two copper electrodes, CuSO₄ solutions of varying concentrations, and a multimeter interfaced with a computer. The incorporation of SiO₂ nanoparticle colloids into the low-concentration half-cell led to pore obstruction by the nanoparticles, resulting in a reduction in the membrane potential, which correlated with the SiO₂ particle concentration. The detection limit for the particle concentration, derived from this correlation, decreased as the SiO₂ particle size increased. Given that the particle concentration can be converted to the particle content in the colloid solution by weight, it was determined that the particle size could be estimated using a calibration curve of the particle content and particle size at the detection limit. Additionally, the introduction of positively charged SiO₂ particles enhanced the surface charge of the membrane, causing a gradual increase in the membrane potential beyond the baseline, following an initial decline. This observation suggests a potential method for determining the charge polarity of particles with unknown surface charges. This study demonstrates the viability of employing a concentration cell as a straightforward and cost-effective method for particle measurement, with the capability to ascertain the particle size and surface charge.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"997 ","pages":"Article 119491"},"PeriodicalIF":4.1,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155250","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}

{"title":"Electrochemical activation of persulfate by particle electrodes in three-dimensional systems: Mechanisms, applications, and future perspectives","authors":"Liujia Fan ,&nbsp;Yanqiong Zhang ,&nbsp;Longchao Liu ,&nbsp;Hongxue Du ,&nbsp;Mingyue Piao","doi":"10.1016/j.jelechem.2025.119490","DOIUrl":"10.1016/j.jelechem.2025.119490","url":null,"abstract":"<div><div>The electro-activation of persulfate (PS) using particle electrodes in three-dimensional electrochemical systems (3DPE-PS) has emerged as a promising advanced oxidation process (AOP) for the efficient degradation of emerging contaminants (ECs). This technology combines the strong oxidizing capability of PS with the enhanced mass transfer and abundant active sites provided by particle electrodes. This comprehensive review analyzes current developments in 3DPE-PS, focusing on four key aspects: (1) characterization and performance of particle electrode materials, (2) optimization of critical operational parameters (electrode composition, applied current/voltage, persulfate dosage, and pH) to maximize degradation efficiency, (3) mechanistic understanding of electrochemical persulfate activation pathways, and (4) its applications for EC removal in various water matrices. The synergistic effects between electrochemical processes and PS activation are highlighted, emphasizing enhanced mass transfer and electron utilization in 3D systems. Despite significant progress, challenges such as long-term stability, scalability, and byproduct formation are faced. Future research directions include the design of cost-effective particle electrodes, mechanistic elucidation under complex water matrices, pilot-scale validation, and byproduct toxicity. This work provides valuable guidance for both fundamental research and practical implementation of 3DPE-PS technology, ultimately contributing to more sustainable water treatment solutions.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"997 ","pages":"Article 119490"},"PeriodicalIF":4.1,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119079","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}

{"title":"Synergistic regulation of carbonyl oxygen active sites and micropores in lignite-derived porous carbon for high-performance supercapacitors","authors":"Zhenming Cui ,&nbsp;Hongwei Liu ,&nbsp;Xiaokang An ,&nbsp;Xin An ,&nbsp;Zhennan Qiao ,&nbsp;YongZhen Wang","doi":"10.1016/j.jelechem.2025.119488","DOIUrl":"10.1016/j.jelechem.2025.119488","url":null,"abstract":"<div><div>Oxygen-rich porous carbon derived from low-rank lignite offers a cost-effective route to pseudocapacitive materials. Here, we integrate NaCl hard templating, freeze-drying, and KOH activation to construct oxygen-rich lignite-derived porous carbon (OLPC) with abundant micropores and high carbonyl oxygen content. Machine learning feature analysis and density functional theory (DFT) jointly reveal the critical roles of pore structure and carbonyl oxygen species in enhancing capacitive performance. The optimized OLPC-600 exhibits a high specific surface area (2132 m² g⁻¹), a 71 % micropore ratio, and significant carbonyl oxygen content (6.18 % C<img>O). This material achieves a specific capacitance of 357 F g⁻¹ at 0.5 A g⁻¹ and an energy density of 16.2 Wh kg⁻¹ at 275 W kg⁻¹ in a symmetric supercapacitor. The synergy between micropores and carbonyl functionalities accounts for this superior performance. These findings highlight a practical pathway for lignite valorization and provide a cost-effective strategy for designing high-performance carbon-based energy storage materials.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"997 ","pages":"Article 119488"},"PeriodicalIF":4.1,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155248","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}

{"title":"Synthesis of chiral multi-hole polydopamine nanospheres for spectroscopic and electrochemical discrimination of tryptophan enantiomers","authors":"Junyao Li ,&nbsp;Nan Shi ,&nbsp;Chen Jin,&nbsp;Laidi Xu,&nbsp;Yong Kong","doi":"10.1016/j.jelechem.2025.119486","DOIUrl":"10.1016/j.jelechem.2025.119486","url":null,"abstract":"<div><div>Au nanoparticles (AuNPs) are adsorbed onto the surface of multi-hole polydopamine (mPDA) nanospheres, which are utilized for the covalent bonding of L-cysteine (L-Cys) as the chiral source. The obtained mPDA@AuNPs/L-Cys is applied in the spectroscopic and electrochemical discrimination of tryptophan (Trp) enantiomers. Due to the same rotatory direction of L-Cys and L-Trp, L-Trp is selectively combined with the mPDA@AuNPs/L-Cys, and thus the chiral discrimination of the Trp enantiomers can be successfully achieved. Chiral solid polydopamine (sPDA) nanospheres are also synthesized and used for the chiral discrimination of the Trp enantiomers, while the discrimination ability of the chiral sPDA is significantly lower than that of the chiral mPDA. The improved discrimination ability of the chiral mPDA can be ascribed to its unique multi-hole structure, which is in favour of combining more amount of AuNPs and L-Cys.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"997 ","pages":"Article 119486"},"PeriodicalIF":4.1,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119080","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}

{"title":"Rapid fabrication of zinc oxide/cobalt oxide based electrochromic electrodes via electrodeposition for enhanced performance electrochromic supercapacitors","authors":"Muhammad Norhaffis Mustafa ,&nbsp;Nur Najwa Abdul Talib ,&nbsp;Farah Ezzah Ab Latif ,&nbsp;Arshid Numan","doi":"10.1016/j.jelechem.2025.119478","DOIUrl":"10.1016/j.jelechem.2025.119478","url":null,"abstract":"<div><div>Electrochromic supercapacitors (ECSCs) have attracted significant attention due to their potential for simultaneous energy storage and optical modulation. However, achieving high performance in electrochemical and electrochromic properties remains challenging. Therefore, optimizing the fabrication of high-performance electrochromic materials is crucial. The oxide composites, such as zinc oxide (ZnO) and cobalt oxide (CoO), can deliver enhanced electrochemical and optical characteristics of ECSCs. This study presents the fabrication and optimization of a zinc oxide/cobalt oxide (ZCO) composite via a facile electrodeposition and response surface methodology to enhance the electrochromic and energy storage properties of supercapacitors. The ZCO electrode was fabricated on a conductive substrate using an electrodeposition technique. The electrochemical properties were characterized using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS). The electrochromic performance was evaluated by monitoring the colour change during cycling and measuring the transmittance variation of visible light. The ZCO electrode exhibited significantly improved electrochemical performance compared to individual ZnO or CoO electrodes. The composite showed high specific capacitance (894 F/g, 1 mV/s), excellent cycling stability (80.1 %, 10000 cycles), and enhanced electrochromic behaviour (297.48 cm²/C) with a reversible colour transition. The composite electrode demonstrated a remarkable improvement in optical contrast and energy storage capacity, indicating a synergistic effect between ZnO and CoO. The ZCO composite fabricated by electrodeposition offers a promising, scalable, and cost-effective approach for advanced electrochromic supercapacitors with enhanced electrochemical and optical performance, suitable for next-generation energy storage devices with integrated display functionalities.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"997 ","pages":"Article 119478"},"PeriodicalIF":4.1,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119216","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}

{"title":"Cation competition in phosphate solution: Tailoring the composition and protectiveness of coatings on AZ31 Mg alloy","authors":"Yan-Zhe Yang ,&nbsp;Yu-Zhang ,&nbsp;Li-Ping Wu","doi":"10.1016/j.jelechem.2025.119484","DOIUrl":"10.1016/j.jelechem.2025.119484","url":null,"abstract":"<div><div>The formation, composition, structure and protectiveness of the coatings deposited on AZ31 Mg alloy as a function of [Na⁺]/[K⁺] in phosphate solution were systematically investigated. The results showed that the coating mechanism was based on local supersaturation and competitive precipitation kinetics, with the governance of the competition between Na⁺ and K⁺. At [Na⁺]/[K⁺] &lt; 1, K⁺ outcompeted Na⁺, producing a monolayer composed of Mg(OH)₂ (brucite), MgHPO₄·3H₂O (newberyite) and KMgPO₄·6H₂O (struvite-K). At [Na⁺]/[K⁺] ≥ 1, Na⁺ outcompeted K⁺, generating a three-layer coating with newberyite/brucite as the inner layer, newberyite/brucite/struvite as the middle layer and newberyite/brucite/struvite/ KNaMg₂(PO₄)₂·14H₂O (hazenite) as the outer layer. Regardless of [Na⁺]/[K⁺] NaMgPO₄·7H₂O (struvite-Na) was not formed due to its poor stability, higher hydration energy of Na⁺ and mismatch between the size of PO₄ and Na⁺, while hazenite formation was completely inhibited at [Na⁺]/[K⁺] <strong>&lt;</strong> 1 due to a higher hydration energy and undersaturation of Na⁺. Increasing [Na⁺]/[K⁺] reduced coating thickness and struvite-K/hazenite content due to enhanced crystal nucleation vs. growth rate. The optimum [Na⁺]/[K⁺] was 1, yielding the most protective coating and reducing the corrosion current density of AZ31 Mg alloy by more than 10 times, linked to the highest struvite-K/hazenite content.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"997 ","pages":"Article 119484"},"PeriodicalIF":4.1,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096451","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}