Electrochimica Acta最新文献

{"title":"Nanoneedle array structure optimization-induced mass transfer in all-vanadium flow batteries","authors":"Yuan Liu ,&nbsp;Haoming Meng ,&nbsp;Kai Wan ,&nbsp;Sen Yao ,&nbsp;Yuxiang Miao ,&nbsp;Jinghua Li ,&nbsp;Jiaxi Xia ,&nbsp;Hai Li ,&nbsp;Mingfeng Du ,&nbsp;Tao Xie ,&nbsp;Chong Li ,&nbsp;Jianjun Hu","doi":"10.1016/j.electacta.2025.146089","DOIUrl":"10.1016/j.electacta.2025.146089","url":null,"abstract":"<div><div>This paper employs a robust acid pretreatment to activate the graphite felt electrode, subsequently facilitating the generation of nickel cobalt oxide (NiCoO₂) nano-needle arrays on the surface of the graphite felt electrode through a hydrothermal method. Additionally, the paper demonstrates the successful doping of the NiCoO₂ structure with nitrogen through the utilization of an ammonia annealing process. The experimental results reveal that this modification initiative enlarges the BET specific surface area of the electrode by a factor of sixteen. Furthermore, the needle array structure not only increases the delivery of active substances but also greatly facilitates the electrochemical reaction. The electrochemical performance of the modified graphite felts was markedly enhanced in comparison to that of the pristine graphite felts, due to the combined effect of the Ni-Co oxides' efficient electrocatalytic ability and the improvement of the mass transfer ability of the electrode resulting from the alteration of the electrode surface structure. The doping of the metal oxides with nitrogen can further increase their conductivity, thereby enhancing their catalytic performance for redox reactions. The Multiphysics simulation results on the electrode surface demonstrate that the upright channels between the needle arrays facilitate the full and rapid reaction of vanadium ions on the electrode surface, enabling the products to be detached from the electrode in a timely manner, which in turn reduces the concentration polarization on the electrode surface.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146089"},"PeriodicalIF":5.5,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143675437","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":"Performance Evaluation of Hydrothermally Prepared Ce-doped SrSnO3 for Electrochemical Energy Storage","authors":"Shahzaib Khan, Soumaya Gouadria, Abdullah G. Al-Sehemi, Abhinav Kumar","doi":"10.1016/j.electacta.2025.146091","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146091","url":null,"abstract":"Perovskite-based nanostructures have been widely researched for supercapacitors, resulting in their outstanding conductivity, electrochemical features, minimal cost, and eco-friendliness. However, this study aims to compare the electrochemical activity of strontium tin oxide (SrSnO₃) and Ce-doped SrSnO₃ created by a one-pot hydrothermal procedure. The as-prepared materials were thoroughly analysed for their structure, chemical composition, and capacitive performance. The X-ray diffraction analysis indicated that the SrSnO₃ phase had a cubic crystal system. The capacitance, charge/discharge rate, and rate capability of SrSnO₃ were improved by cerium doping. The Ce-doped SrSnO₃ showed exceptional super-capacitive activity with a specific capacitance (C_sp) of 1155 F/g, specific energy (S_E) of 48 Wh/kg, and specific power (S_P) of 308 W/kg at a 1 A/g current density (j). Additionally, the doped material exhibited lower internal resistance than the undoped sample. The remarkable performance of the doped material was accredited to increased active sites, conductivity, electroactive surface, and a high ion diffusion rate. The advantageous characteristics of Ce-doped SrSnO₃ render it a potential material for electrochemical devices. However, the results provide a solid basis for creating advanced supercapacitor electrodes with more remarkable performance. Therefore, this work enhances our understanding of perovskites and demonstrates their potential use in electrochemistry, particularly for energy storage.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"18 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143675438","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":"CuO doping SiO2 for enhancing electron transfer to product C2H4 in electrocatalytic CO2 reduction","authors":"Xu Ji, Weicong Xu, Chao Liu, Xing Wang","doi":"10.1016/j.electacta.2025.146090","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146090","url":null,"abstract":"The electrocatalytic CO₂ reduction reaction (CO₂RR) offers a promising pathway for carbon cycling and high-value fuel synthesis. However, the efficient production of ethylene (C₂H₄), a critical multicarbon product, remains constrained by insufficient catalyst activity and selectivity. Although copper-based materials enable C–C coupling, conventional CuO catalysts suffer from imbalanced *CO intermediate adsorption strength and sluggish charge transfer kinetics‌.In this study, a silica (SiO₂) doping strategy was employed to synergistically modulate the electronic structure and surface active site distribution of CuO, significantly enhancing CO₂-to-C₂H₄ conversion efficiency. Experimental results demonstrate that SiO₂ incorporation induces local electronic density rearrangement around Cu²⁺, stabilizing *CO adsorption, while the constructed Cu-O-Si interfaces accelerate charge transfer, enhances electron transfer and reduce the energy barrier for *COCHO formation. The optimized SiO₂-10%/CuO catalyst achieves a C₂H₄ Faraday efficiency of 42% and a partial current density of 6.3 mA/cm² at −1.4 V (vs. RHE), representing a threefold improvement over pristine CuO. Notably, the catalyst exhibits exceptional stability over 4 hours‌.Structural characterization and theoretical calculations reveal that SiO₂ doping promotes the self-assembly of CuO nanosheets into flower-like architectures with a high specific surface area and exposes synergistic (111)/(002) facets, which collectively enhance *CO intermediate enrichment and directional coupling‌. This work provides novel insights into designing high-performance CO₂RR catalysts through multidimensional modulation strategies.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"70 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143675466","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":"Correction to the conventional Klingler-Kochi method for accurate assessment of electrochemical kinetic parameters utilizing cyclic voltammetry","authors":"Rahul Agarwal","doi":"10.1016/j.electacta.2025.146081","DOIUrl":"10.1016/j.electacta.2025.146081","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The conventional Klingler-Kochi method has been utilized for several decades and has recently gained significant traction in the estimation of electrochemical kinetic parameters. This includes the determination of formal electrode potential (&lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;/mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt;), standard rate constant (&lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;k&lt;/mi&gt;&lt;/mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt;) and dimensionless kinetic parameter (ψ) through the technique of cyclic voltammetry. However, the values obtained through this method occasionally exhibit significant discrepancies when compared to those derived from alternative techniques. The validation of the analytically derived Klingler-Kochi equations through alternate theoretical approach namely numerical methods (digital simulations) has revealed inaccuracies, resulting in misleading interpretations of kinetic data. Consequently, the original equations proposed by Klingler-Kochi have been re-derived, resulting in the refinement of the previous equations. This revised approach is referred to as the corrected Klingler-Kochi method, which should be employed for the accurate estimation of &lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;/mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;k&lt;/mi&gt;&lt;/mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; and ψ for redox couples that adhere to the Butler-Volmer kinetic model, particularly those with a peak potential difference greater than 150 mV and a cathodic charge transfer coefficient (&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mi&gt;α&lt;/mi&gt;&lt;mi&gt;c&lt;/mi&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;) within the range of 0.3 &lt; &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mi&gt;α&lt;/mi&gt;&lt;mi&gt;c&lt;/mi&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; &lt; 0.7. The assertions are additionally substantiated by experimental validation through voltammetric analysis of the redox couples &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;[&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;mo&gt;]&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;4&lt;/mn&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;[&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;mo&gt;]&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;[&lt;/mo&gt;&lt;mrow&gt;&lt;mtext&gt;Pu&lt;/mtext&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;mo&gt;]&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;4&lt;/mn&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;[&lt;/mo&gt;&lt;mrow&gt;&lt;mtext&gt;Pu&lt;/mtext&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;mo&gt;]&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;F&lt;/mi&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;e&lt;/mi&gt;","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146081"},"PeriodicalIF":5.5,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143675436","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":"Recombination layers for effective hydrogen crossover mitigation in proton exchange membrane water electrolyzers: Fabrication, characterization, and fundamental principles of operation","authors":"Alanna M. Gado ,&nbsp;Ryan J. Ouimet ,&nbsp;Leonard Bonville ,&nbsp;Radenka Maric ,&nbsp;Stoyan Bliznakov","doi":"10.1016/j.electacta.2025.146092","DOIUrl":"10.1016/j.electacta.2025.146092","url":null,"abstract":"<div><div>One major challenge that proton exchange membrane water electrolyzers (PEMWEs) face is hydrogen (H₂) gas crossover. If left unmitigated, H₂ crossover impacts the cell durability and becomes a safety issue. Fabrication of a catalytic recombination layer (RL) within the volume of the proton exchange membrane that provides active catalytic sites for recombination of hydrogen and oxygen gas molecules to water, is a viable strategy for H₂ crossover mitigation. This paper reports on designing, fabrication, and testing of membrane electrode assemblies (MEAs) for PEMWEs with two RLs. The recombination layers are incorporated into the volume of the membrane of a MEA fabricated by the reactive spray deposition technology (RSDT) method. As fabricated MEAs with an active area of 25 cm² and low catalyst loadings (0.3 mg_Ir cm^-2 on the anode and 0.2 mg_Pt cm^-2 on the cathode) demonstrated excellent performance. The RSDT-fabricated RLs demonstrated effective reduction of the H₂ crossover from about 50% of the lower flammability limit (LFL) to below 10% of the LFL, when operating at current densities between 0.58 A cm^-2 and 1.86 A cm^-2. Electrochemical impedance spectroscopy and distribution of relaxation times analysis are used to study the mechanism of the recombination reaction for both RLs. The analysis of the results provides for the first-time insights into the fundamental mechanism of the H₂ and O₂ recombination reaction on the Pt active catalytic sites in the RLs integrated in the membrane of PEMWEs.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146092"},"PeriodicalIF":5.5,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143675467","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":"Dynamic Impedance-Based Monitoring of St37 Carbon Steel Corrosion in Sterilized Manganese Broth Medium","authors":"Husnu Gerengi, Pierangela Cristiani, Moses M. Solomon, Esra Ilhan-Sungur, Mesut Yıldız, Pawel Slepski","doi":"10.1016/j.electacta.2025.146011","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.146011","url":null,"abstract":"Microbiologically influenced corrosion (MIC) of metals is a serious challenge where Manganese oxidizing bacteria (MOB) can play a relevant role. However, there is no consensus on how MOB influences corrosion mechanisms. This arises from the complexity of the corrosion process and the challenge of distinguishing the effects of chemicals from the biological contributions. In this work, the electrochemical characteristics of St37 carbon steel in a bacteria-free Mn broth medium were monitored for 5 h using the new technique of Dynamic Electrochemical Impedance Spectroscopy (DEIS). The results were compared with those from the classical electrochemical techniques to validate the new technique. DEIS accurately tracked corrosion processes in the media and analysis of the variation of parameters such as the polarization resistance (<em>R</em>_p), corrosion potential (<em>E</em>), and constant phase elements (<em>n</em>, and <em>Y</em>₀) proved valuable insight in understanding the corrosion processes. The study reveals that, in a sterile Mn broth medium, the corrosion resistance of St37 steel improved over time due to the adsorption of yeast and (NH₄)₂Fe(SO₄)₂ on the surface. SEM and EDX results confirm the adsorption of protective deposits on the steel surface. The polarization resistance of St37 steel increased up to 12000 Ω cm² at 5 h of measurement. The results from the DEIS technique conform with those from the classical techniques. The work therefore established the DEIS technique as reliable for corrosion measurements in a dynamic system. The results achieved can serve as a suitable baseline for future MIC studies induced by MOB.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"16 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143672769","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":"Effect of silica leaching treatment during template-assisted synthesis on the performance of FeNC catalysts for oxygen reduction reaction","authors":"Giulia Gianola ,&nbsp;Alessio Cosenza ,&nbsp;Camille Roiron ,&nbsp;Candido F. Pirri ,&nbsp;Stefania Specchia ,&nbsp;Plamen Atanassov ,&nbsp;Juqin Zeng","doi":"10.1016/j.electacta.2025.146085","DOIUrl":"10.1016/j.electacta.2025.146085","url":null,"abstract":"<div><div>The development of cost-effective and environmentally sustainable electrocatalysts is crucial for advancing the commercialization of proton exchange membrane fuel cells (PEMFCs). In this work, we investigate the effect of different silica leaching strategies on the synthesis of iron-nitrogen-carbon (FeNC) electrocatalysts for the oxygen reduction reaction (ORR). Three FeNC samples were prepared using SBA-15 mesoporous silica as the template and subjected to varying removal techniques: hydrofluoric acid (HF), sodium hydroxide followed by hydrochloric acid (NaOH+HCl), and an acid-free Teflon-assisted process. Physical-chemical characterization reveals significant differences in the surface area and porosity of the three catalysts. The specific surface areas of FeNC treated with NaOH+HCl and HF are 1352 m²/g and 1403 m²/g, respectively, while the Teflon-treated sample exhibits a much lower value of 732 m²/g. Electrochemical tests using a rotating ring disk electrode (RRDE) apparatus demonstrate superior ORR activity of the FeNC treated with NaOH+HCl, achieving onset potentials of 0.93 V_RHE and 0.81 V_RHE in alkaline and acidic media, respectively, outperforming the HF- and Teflon-treated counterparts. The HF treatment, while effective in removing silica and metallic impurities, poses environmental and safety challenges. The Teflon-assisted approach, despite its promise as a greener alternative, results in a lower surface area and diminished ORR activity, with onset potentials of 0.89 V_RHE and 0.76 V_RHE in alkaline and acidic media, respectively. This study highlights the importance of optimizing silica removal methods to balance the catalyst performance, safety and sustainability, with the NaOH+HCl method emerging as the most effective approach for producing high-performance FeNC ORR catalysts for fuel cell applications.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146085"},"PeriodicalIF":5.5,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143672781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancement of the cyclic stability of a Li-excess layered oxide through a simple electrode treatment for LiF-coating","authors":"JunHo Lee ,&nbsp;Hyeonmuk Kang ,&nbsp;JungHyeon Moon ,&nbsp;Heechan Kang ,&nbsp;GyuSeong Hwang ,&nbsp;GeunHyeong Shin ,&nbsp;GyungTae Kim ,&nbsp;TaeHee Kim ,&nbsp;EunAe Cho","doi":"10.1016/j.electacta.2025.145919","DOIUrl":"10.1016/j.electacta.2025.145919","url":null,"abstract":"<div><div>Lithium-rich layered cathodes (LLCs) are considered to be promising next-generation materials for lithium-ion batteries (LIBs) due to their high specific capacity and energy density. However, their poor cyclability poses a significant challenge for commercial applications. In this study, we introduce a straightforward one-step electrode heat-treatment method involving a lithium fluoride (LiF) coating on conventional LLCs, without the need for additional coating precursors, to enhance the cyclability. During the heat-treatment, lithium residues (LiOH and Li₂CO₃) and the PVDF used as a binder react to form an amorphous LiF coating layer (LiF-LLC). Although LiF-LLC initially exhibited a lower capacity compared to pristine LLC (220.2 vs. 246.6 mAh g⁻¹) due to its higher overpotential, it demonstrated superior performance after 100 cycles at 0.2 C. LiF-LLC maintained a discharge capacity of 219.4 mAh g⁻¹ with 95.1 % retention, while pristine LLC showed an outcome of only 164.8 mAh g⁻¹ with 83.4 % retention. A comprehensive analysis revealed that the LiF coating layer effectively passivated the cathode interface, preventing transition metal dissolution and a phase transformation caused by a HF attack. Additionally, LiF-LLC exhibited higher lithium-ion diffusivity, lower interfacial impedance, and enhanced Mn- and O-ion redox activities. These findings demonstrate that the simple electrode heat-treatment significantly improves the cyclic stability of LLCs.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"524 ","pages":"Article 145919"},"PeriodicalIF":5.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143660874","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":"Mg- and Ni-modified Fe2O3@rGO as enhanced peroxide scavenger cocatalysts in oxygen reduction reaction","authors":"Leonardo Balducci ,&nbsp;Mohsin Muhyuddin ,&nbsp;Hamideh Darjazi ,&nbsp;Giuseppina Meligrana ,&nbsp;Carlo Santoro ,&nbsp;Francesco Nobili","doi":"10.1016/j.electacta.2025.146088","DOIUrl":"10.1016/j.electacta.2025.146088","url":null,"abstract":"<div><div>The exploitation of graphene oxide (GO)-based composites for fuel cell electrocatalysts has gained significant interest, yet the integration of iron oxide nanoparticles grafted onto GO, doped with different metals, remains relatively unexplored. This study aims to fill this gap by synthesizing and characterizing Fe₂O₃ nanoparticles grafted on GO doped with two different metals, specifically magnesium and nickel, each at three different concentrations (6%, 12%, and 18% by weight). The successful doping and incorporation of Fe₂O₃ on the GO matrix is confirmed using X-ray diffraction (XRD) and Raman spectroscopy. Scanning electron microscopy (SEM) provides insights into the morphology and dispersion of Fe₂O₃ nanoparticles on the GO surface. Rotating Ring Disk Electrode (RRDE) is used to analyze the electrochemical activities toward the oxygen reduction reaction (ORR). The results demonstrated improved electrocatalytic activity and selectivity with increasing metal concentration. Notably, the electrocatalysts with 6% Mg and 6% Ni doping exhibit superior peroxide scavenging properties. When 6% Ni is mixed with FePc600, it provides additional active sites devoted to the peroxide scavenging increasing the limiting current from 4.69 to 5.62 mA cm^-2, halving the peroxide production, passing from 5.1% to 2.9%. Overall, this study provides insights into the tunable properties of Fe₂O₃@GO composites through metal doping, offering a versatile approach to enhance the performance of composite materials in various technological applications, and specifically suggests that Fe₂O₃ grafted on GO, modified with Mg and Ni, holds significant potential as a cocatalyst for ORR in energy devices such as alkaline fuel cells.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146088"},"PeriodicalIF":5.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143666480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A low-transition-temperature electrolyte based on ethylene glycol for rechargeable zinc-ion batteries","authors":"Matteo Palluzzi ,&nbsp;Marita Afiandika ,&nbsp;Shizhao Xiong ,&nbsp;Akiko Tsurumaki ,&nbsp;Paola D'Angelo ,&nbsp;Aleksandar Matic ,&nbsp;Maria Assunta Navarra","doi":"10.1016/j.electacta.2025.146061","DOIUrl":"10.1016/j.electacta.2025.146061","url":null,"abstract":"<div><div>Zinc-ion batteries (ZIBs) offer promising energy storage solutions due to their high capacity, abundance and low cost of raw materials, and stability in air of zinc. Despite these advantages, ZIBs with aqueous electrolytes struggle with issues like dendrite formation, hydrogen evolution, and zinc corrosion. This study explores the use of low-transition-temperature (LTT) mixtures as electrolytes to address these critical issues of ZIBs. Novel LTT electrolytes at different molar ratios of Zn(TFSI)₂ and ethylene glycol (EG), chosen for their cost-effectiveness, were prepared. The LTT electrolytes were characterized, through spectroscopic and electrochemical methods, and the most promising one (Zn:EG 1:7) was further evaluated in a full cell by coupling Zn metal with a K⁺-doped vanadium oxide (K₀.₅V₂O₅, KVO) cathode. The full cell shows an excellent stability upon cycling and notable suppression of the dendritic growth, but limited capacities. Our electrolyte system holds significant potential for advancing ZIB technology if further developed.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146061"},"PeriodicalIF":5.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143660872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}