Electrochimica Acta最新文献

{"title":"Hierarchical structure composed of Cu2S nanosheets/rods wrapped with phosphorus-doped carbon as a freestanding electrode for advanced sodium-ion battery","authors":"Miao Hu ,&nbsp;Kerou Qiu ,&nbsp;Xinsheng Li,&nbsp;Jinliang Zhu","doi":"10.1016/j.electacta.2025.147481","DOIUrl":"10.1016/j.electacta.2025.147481","url":null,"abstract":"<div><div>Copper sulfide (Cu₂S) has emerged as a promising anode material for sodium-ion batteries (SIBs), owing to its cost-effectiveness, natural abundance, and environmental compatibility. However, its practical application is hindered by intrinsic limitations including poor electrical conductivity and severe volume expansion during cycling. To address these challenges, we developed a novel hybrid architecture composed of phosphorus-doped carbon wrapped Cu₂S nanosheet/rods with (P-Cu₂S@C NSRs) through an eco-friendly, solid ionic resin-assisted chemical vapor deposition (CVD)-like strategy, where the resin simultaneously serves as dual phosphorus and sulfur precursors. This hierarchical structure synergistically achieves three critical functions: 1) effective buffering of Cu₂S volume fluctuations, 2) prevention of aggregation, and 3) shortened Na⁺ diffusion pathways. When directly employed as a binder-free electrode (grow on copper foam), the P-Cu₂S@C NSRs demonstrate exceptional electrochemical performance without requiring additional conductive agents or post-synthesis treatments. The optimized electrode delivers a remarkable areal capacity of 3.69 mAh cm^–2 (93.3 % initial Coulombic efficiency) after 100 cycles at 0.5 mA cm^–2, maintaining 3.22 mAh cm^–2 after 500 cycles at an elevated current density of 1 mA cm^–2. This work establishes a sustainable synthesis paradigm for designing high-capacity metal sulfide anodes with superior structural stability for next-generation energy storage systems.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147481"},"PeriodicalIF":5.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145189281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic Effect of rGO, α-Fe2O3 and TiO2 in Ternary Nanocomposites for High-Performance Supercapacitor Electrodes","authors":"K.D. Jagtap, R.V. Barde, K.R. Nemade, S.A. Waghuley","doi":"10.1016/j.electacta.2025.147474","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147474","url":null,"abstract":"Using a straightforward ex-situ technique, a new ternary nanocomposite consisting of reduced graphene oxide (rGO), α-FeO₃, and TiO₂ was created and tested as a high-performance supercapacitor electrode. Crystalline α-FeO₃ and TiO₂ phases integrated into the rGO matrix were verified by XRD. Strong interfacial contacts between the components were confirmed by FTIR, whereas SEM-EDX examination showed evenly distributed nanoparticles on rGO sheets. Excellent performance was shown by electrochemical examination using galvanostatic charge-discharge (GCD), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). The RFT2 electrode demonstrated excellent charge-discharge behavior, high coulombic efficiency, and a high specific capacitance of 646.5 F/g at 20 mV/s. Low internal resistance and effective ion diffusion were demonstrated by the EIS data. After 2000 cycles at 1 A/g, long-term cycling testing verified an 87.3 % capacitance retention. This composite is a viable option for advanced energy storage applications because of the synergistic interaction between conductive rGO and pseudocapacitive α-FeO₃ and TiO₂, which is responsible for the improved electrochemical performance.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"11 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145189432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic MXene/TiN Nanocomposite as a Noble Metal Free Catalyst for Efficient Methanol Electro-Oxidation in Alkaline Fuel Cells","authors":"Nasrin Moradbeigi, Ali Bahari, Shahram Ghasemi","doi":"10.1016/j.electacta.2025.147483","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147483","url":null,"abstract":"The first-time synthesis of a noble-metal-free Ti₃C₂T_x MXene/titanium nitride (TiN) composite electrocatalyst with exceptional performance for the methanol oxidation reaction (MOR) in alkaline direct methanol fuel cells (DMFCs) is reported in this study. The composite is synthesized via a two-step strategy combining hydrothermal treatment and subsequent nitridation, resulting in a well-integrated heterostructure with enhanced conductivity and active surface area. Structural analyses confirm the successful formation and uniform elemental distribution of the layered MXene/TiN hybrid. Electrochemical measurements reveal a remarkable peak current density of 375.5 mA cm⁻² and a maximum power density of ∼48 mW cm⁻², significantly outperforming pristine TiN (∼22 mW cm⁻²) and MXene (∼13 mW cm⁻²). This enhancement is attributed to the synergistic interaction between the highly conductive 2D MXene sheets and catalytically active TiN nanoparticles, which together promote efficient charge transfer and accelerate MOR kinetics. Compared to previously reported MXene- or TiN-based catalysts, this binary system demonstrates superior integration, higher power output, and greater long-term stability-without reliance on noble metals. These findings highlight the potential of MXene/TiN composites as scalable, cost-effective electrocatalysts for next-generation sustainable fuel cell technologies.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"31 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145189434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Foreword to International Symposium on Enhanced Electrochemical Capacitors, ISEECap 2024","authors":"Maria Arnaiz, Jon Ajuria","doi":"10.1016/j.electacta.2025.147459","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147459","url":null,"abstract":"No Abstract","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"104 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145189282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tailoring interlayer channels of iron oxalate by regulated stress in polymorphic structure to enhance the lithium storage","authors":"Geng Gao, Jian Tang, Hui Zhang, Guiling Yang, Bo Jin, Qing Zhao, Yin Li, Junxian Hu, Shaoze Zhang, Keyu Zhang, Feng Liang, Bin Yang, Yaochun Yao","doi":"10.1016/j.electacta.2025.147479","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147479","url":null,"abstract":"Iron (II) oxalate is a cost-effective anode material with high theoretical capacity for lithium-ion batteries, yet its practical performance is hindered by sluggish lithium-ion diffusion and limited active site utilization. Here, inspired by dehydration-induced cracking in plant tissues, we propose a biomimetic strategy to engineer interlayer channels in iron oxalate to address these limitations. Specifically, a rod-like FeC₂O₄·2H₂O precursor composed of stacked lamellar particles with mixed α/β crystalline phases was synthesized by ethylene glycol assisted co-precipitation method. The regulated dehydration stress by polymorphic structure induced anisotropic shrinkage and multichannel formation of iron oxalate. A β-phase-rich composition (59.05 wt%) ensured rapid dehydration, while the α-phase (40.95 wt%) provided structural buffering. The resulting structure delivered an exceptional lithium storage capacity of 1144 mAh g⁻¹ at 0.5 A g⁻¹ and retained 709 mAh g⁻¹ at 5 A g⁻¹. This work demonstrates a biomimetic phase-engineering strategy for tuning interlayer structures in coordination compounds and offers a new route for designing single-layer structured oxalates by leveraging stress in polymorphic structure.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"21 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145183224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic enhancement of Li-ion and electron transport in thick electrodes via tailored microstructural gradients","authors":"Shaohai Dong ,&nbsp;Junpei Wang ,&nbsp;Yuhang Lyu,&nbsp;Zhan-Sheng Guo","doi":"10.1016/j.electacta.2025.147482","DOIUrl":"10.1016/j.electacta.2025.147482","url":null,"abstract":"<div><div>The global transition to decarbonization and the rapid rise of electric mobility demand lithium-ion (Li-ion) batteries with higher energy density. Thick electrodes offer a viable pathway but introduce microstructural complexity that impedes Li-ion and electron transport. In this study, a heterogeneous particle-packing model with active material-binder gradients is developed to investigate how gradients in particle size, particle diffusion coefficient, porosity, electronic conductivity, and conductive binder content enhance electrode performance from the perspectives of Li-ion and electron transport. The results reveal that: (1) particle-size gradients combine lower tortuosity from large particles with shorter diffusion paths from small particles; (2) diffusion-coefficient gradients facilitate Li-ion insertion near the separator; (3) porosity gradients enhance Li-ion transport in the electrolyte while maintaining energy density; and (4) conductivity and binder gradients improve electronic pathways. At higher discharge rates and greater electrode thickness, Li⁺ accumulation intensifies near the separator, while overpotential rises markedly adjacent to the current collector. Consequently, an effective strategy for thick electrode design is to enhance ionic transport at the separator side in combination with enhanced electronic conductivity at the current collector side. These insights provide guiding principles for the rational design of high-performance thick electrode architectures.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147482"},"PeriodicalIF":5.6,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145189283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"N-Doped Carbon Nanofiber-based LiMnxFe1-xPO4 cathodes via Imidazolium Ionic Liquid-Assisted Electrospinning for High-Performance Batteries","authors":"Jiahui Dai, Yan Wang, Zhihua Wang, Ling Tan, Zhenghua Deng, Jinjie Niu, Faquan Yu","doi":"10.1016/j.electacta.2025.147478","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147478","url":null,"abstract":"The olivine-structured LiMn_xFe_1-xPO₄ (LMFP) cathode material fabricated via traditional methods exhibits rapid capacity fade during the cycling process and poor rate capability, leading to a relatively short cycle life, which constrains its widespread application and commercialization. To enhance the electrochemical performance of LMFP, polyacrylonitrile (PAN) was employed as the spinning medium to form a nanoscale network structure after heat treatment. Concurrently, a rheological ionic liquid (IL) was utilized as the precursor in the electrospinning process of lithium ferromanganese phosphate. This method facilitates the penetration and coverage of the inherent active material, promoting the formation of a continuous and thin carbon layer on its surface. Moreover, it serves as a soft template for generating uniform pores that enhance ion transport kinetics. Through systematic investigation of PAN concentration, optimization of the experimental parameters, and adjustment of the annealing conditions, an increase in unit cell volume was successfully achieved, resulting in a high reversible capacity. In addition to the rational design of nanofibers with uniform thickness and stable structure, the even distribution of active particles contributes to the material's excellent cycling stability. The LiMn_0.8Fe_0.2PO₄/PAN 12 nanofiber cathode material prepared under optimized annealing conditions delivers an initial discharge specific capacity of up to 164.1 mAh · g⁻¹ at 0.1 C. In the multi-rate charge-discharge tests conducted from 0.1 C to 5 C, the material exhibited discharge specific capacities of 136.2, 120.5, and 93.8 mAh·g⁻¹ at 1 C, 2 C, and 5 C rates, respectively. Upon reverting to 0.1 C, nearly no capacity loss was observed. During long-term cycling tests, the material displayed excellent capacity retention, maintaining 85.9% of its initial capacity after 200 cycles at 1 C. This study proposes a novel synthesis strategy for LMFP, offering promising potential for its application in high-performance power sources.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"127 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145183220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced discharge performance of AM60-0.6La anode for Mg-air battery via grain structure modification and secondary phase control","authors":"Rongqian Wu ,&nbsp;Jing Zhao ,&nbsp;Liang Wu ,&nbsp;Jianpeng Xiang ,&nbsp;Yuantai He ,&nbsp;Yuan Yuan ,&nbsp;Jinxing Wang ,&nbsp;Jingfeng Wang ,&nbsp;Yanlong Ma ,&nbsp;Viswanathan S. Saji","doi":"10.1016/j.electacta.2025.147477","DOIUrl":"10.1016/j.electacta.2025.147477","url":null,"abstract":"<div><div>The study investigates the effect of hot-rolling on enhancing the performance of a magnesium alloy anode in a magnesium-air battery. The hot-rolling process may influence the anode corrosion and discharge behavior by altering the alloy's microstructure. Specifically, we investigated whether the hot-rolling parameters (rolling reduction) could enhance the discharge performance of the Mg-6Al-0.3Mn-0.6La (AM60-0.6La) alloy anode. The results indicated that the rolling process facilitated the formation of a more effective passive film on the surface of the AM60-0.6La alloy under polarized conditions, thereby partially offsetting the corrosion-promoting effect induced by grain refinement. The rolling reductions applied to the AM60-0.6La alloy were 20 %, 40 %, and 60 %, respectively. It was found that the rolling process not only fragmented certain coarse grains, triggering dynamic recrystallization and dynamic recovery, but also disrupted the structure of the second phase, causing it to fracture and effectively increasing the active surface area for discharge in the magnesium alloy. Moreover, the reduced accumulation of discharge products and the presence of a more uniform corrosion morphology confirmed the improved discharge performance. A moderate rolling reduction (20 %) resulted in the most significant enhancement in the properties of the AM60-0.6La alloy. For instance, at a current density of 10 mA‧cm⁻², the alloy exhibited a discharge voltage of 1.323 V and an anode efficiency of 65.2 %.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147477"},"PeriodicalIF":5.6,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145183223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Symmetric supercapacitor based on CMC incorporated interconnected V2O5 nanoflakes: Enriched with excellent electrochemical characteristics","authors":"I. Rathinamala, J. Johnson William, F. Winfred Shashikanth, I. Manohara Babu","doi":"10.1016/j.electacta.2025.147473","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147473","url":null,"abstract":"Combination of stable/conductive nanostructure and metal oxide with enhanced electrochemical features are still order of the day in energy market. The current work focuses the fabrication of novel nanostructured composite electrode utilizing potential Faradic nominee (vanadium pentoxide, V₂O₅) and high strength carbonaceous electrode (CMC, carboxymethyl cellulose) via simple and one-spot hydrothermal approach. Surprisingly, the prepared nanocomposite electrode (V₂O₅/C) resembles like interconnected structure which was evidenced by morphological studies. Electrochemical investigations portray that vanadium pentoxide/carboxymethyl cellulose nanocomposite prepared in the present work yielded better rate performance, high specific capacitance, stability than pristine electrodes. It is implicit that excellent electrochemical characteristics associated with the nanocomposite electrode are strongly attributed to the presence of transition metal oxide electrode through its layered structure &amp; multiple redox states. Especially, excellent cyclic stability V₂O₅/C electrode would correspond to CMC through its facile mechanical strength. It was further satisfied by making two terminal device using V₂O₅/C electrode (both positive and negative electrode as well), 6 M KOH electrolyte and polypropylene sheet (separator). The fabricated two electrode cell could capable of providing a maximum energy density of 36 W h kg^-1 with ultra-high power density of 6482 W kg^-1. The pleasant features enriched with the prepared nanocomposite electrode should hold a prominent place in energy sphere.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"106 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145183222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication of Porous Transport Electrodes: Development of Quantitative Approach for Quality Control","authors":"Lonneke van Eijk, Genevieve Stelmacovich, Sunilkumar Khandavalli, James L. Young, Lei Ding, Weitain Wang, Jun Li, Feng-Yuan Zhang, Scott A. Mauger, Adam Paxson, Svitlana Pylypenko","doi":"10.1016/j.electacta.2025.147475","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147475","url":null,"abstract":"This work focuses on porous transport electrodes (PTEs), which integrate the anodic catalyst with the adjacent Ti porous transport layer (PTL). Challenges in catalyst deposition on PTLs, particularly at low loadings, motivated this study to evaluate various fabrication methods and characterization approaches. This work investigated Pt-treated PTLs coated with Ir-based catalysts using several common methods, including airbrush coating, rod coating, ultrasonic spray coating, electrodeposition, and sputter deposition, with catalyst loadings ranging from 2.9 to 0.1 mg/cm², providing the opportunity for comparisons across a large set of samples produced by different methods. Two widely accessible characterization techniques: X-ray computed tomography (XCT) and scanning electron microscopy energy dispersive X-ray spectroscopy (SEM-EDS) were explored. Initial evaluation of selected samples with XCT provided qualitative insights into catalyst distribution, however comprehensive quantitative analysis was limited. SEM-EDS enabled detailed information on the catalyst distribution both qualitatively and quantitatively using two metrics. Atomic and surface area % ratios of Pt:Ir and Ti:Ir revealed trends in catalyst loading and losses into the PTL pores, as well as evaluating the homogeneity of catalyst coatings. The analysis demonstrated that ultrasonic spray coating, electrodeposition, and sputter coating produced the most homogeneous coatings, with minimal catalyst losses observed for electrodeposition and sputter coating. By adapting common techniques with novel, standardized methodologies, this work establishes a universally applicable framework for cross-study comparison of PTEs. The SEM-EDS approach provides a practical, accessible tool for PTE characterization and contributes a reference dataset supporting both research development and rapid quality control.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"4 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145183329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}