Journal of Electroanalytical Chemistry最新文献

{"title":"Self-healing liquid metal-rGO anode via self-assembly driven dynamic encapsulation for stable lithium-ion storage","authors":"Jiali Huang ,&nbsp;Weichi Ye ,&nbsp;Man Mo ,&nbsp;Haiqing Zhan ,&nbsp;Zhipeng Li ,&nbsp;Yong Yang ,&nbsp;Panyu Xiong ,&nbsp;Tianshi Xiong ,&nbsp;Gangli Zhao ,&nbsp;Mingfeng Huang ,&nbsp;Liyun Zhang ,&nbsp;Chunxia Li ,&nbsp;Qingmeng Wei ,&nbsp;Xiongqiang Yang ,&nbsp;Zhijie Fang ,&nbsp;Feng Zhan","doi":"10.1016/j.jelechem.2025.119142","DOIUrl":"10.1016/j.jelechem.2025.119142","url":null,"abstract":"<div><div>Lithium-ion batteries have become dominant in the markets for portable electronic devices and electric vehicles owing to their high energy density and long cycle life. However, traditional alloy-based anode materials (such as Si, Bi, and Sn) still suffer from significant volume expansion, severe electrode pulverization, slow lithium diffusion kinetics, and low Coulombic efficiency. Intrinsic high-capacity liquid metal (LM) materials effectively mitigate the volume deformation of traditional alloy anodes during cycling through their unique deformable liquid properties. Specifically, during delithiation, the ternary alloy solid phase reversibly transforms into a binary liquid structure, and the phase transformation behavior endows the material with self-healing ability, which can spontaneously repair the cracks or pulverized structures generated during cycling. This study proposes a self-assembled dynamic encapsulation strategy based on a Ga<img>Sn eutectic alloy (EGaSn), in which liquid metal nanodroplets are encapsulated via the liquid-phase self-assembly of graphene oxide (GO). The resulting LM-rGO anode exhibits excellent specific capacity (779.29 mAh g⁻¹ after 100 cycles at 0.5 A g⁻¹) and outstanding cycling stability (453.77 mAh g⁻¹ after 500 cycles at 2 A g⁻¹). The encapsulation strategy not only mitigates the volume expansion effect of alloy-based anodes but also enhances the lithium-ion transport kinetics through the synergy between its unique stress-buffering mechanism and the three-dimensional conductive network. This strategy provides an innovative solution for the development of high-performance lithium-ion batteries with self-healing functionalities.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"990 ","pages":"Article 119142"},"PeriodicalIF":4.1,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143917994","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":"Multiphysics modelling for rechargeable zinc-air flow batteries – Part I: A physico-chemical and mathematical reassessment of the model","authors":"Jacopo Strada ,&nbsp;Elisa Emanuele ,&nbsp;Luca Magagnin ,&nbsp;Francesco Nespoli ,&nbsp;Benedetto Bozzini","doi":"10.1016/j.jelechem.2025.119136","DOIUrl":"10.1016/j.jelechem.2025.119136","url":null,"abstract":"<div><div>Mathematical modelling of zinc-air flow batteries is a crucial tool for the design of prototypes and their scaleup: these are highly strategic tasks in the current development of this technology. A limited amount of efforts has been devoted to this research and, notwithstanding results of high scientific standard, often the emphasis on applications dominates the methodological one. In this work, we have first reassessed and clarified some physico-chemical complexities aspects of a standard multiphysics model for a zinc-air flow battery with a porous GDE, a metallic Zn anode and a flowing electrolyte, and extended it to the rechargeable case. The model couples: (i) material conservation for oxygen, zincates and hydroxide with (ii) electrodic electrochemistry in the porous cathode and the compact anode, (iii) charge conservation in the electronically conductive region of the GDE and in the electrolyte, (iv) fluid dynamics for both gas and electrolyte. Then, we have employed the model to: (i) predict polarization curves as a function of operating conditions; (ii) map the limiting current density distribution over the Zn anode during charge, as an estimate of shape change. Some of the functionally relevant computed trends are confirmed by a selection of experimental results.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"988 ","pages":"Article 119136"},"PeriodicalIF":4.1,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869458","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":"Bromide crossover through various perfluorinated cation-exchange membranes in the presence of two cationic components in solution","authors":"O.I. Istakova ,&nbsp;D.V. Konev ,&nbsp;E.V. Zolotukhina ,&nbsp;M.A. Vorotyntsev","doi":"10.1016/j.jelechem.2025.119139","DOIUrl":"10.1016/j.jelechem.2025.119139","url":null,"abstract":"<div><div>Chronoamperometry and steady-state voltammetry data for a specially designed working electrode composed of a Pt disk covered mechanically with various perfluorinated cation-exchange membranes in contact with an external 2 M sulfuric acid solution with addition of various NaBr concentrations have been employed to estimate crossover parameters of bromide ions in relation to redox-flow battery applications. This technically simple but efficient approach has allowed us to determine the values of the diffusion coefficient of the electroactive Br⁻ co-ion inside each membrane and of its equilibrium distribution coefficient between the membrane and the outer solution via an express experimental procedure and subsequent simple calculations. These crossover parameters of bromide co-ions have been found for Nafion NR211, Nafion XL, Nafion NR212, Nafion N115, Nafion N117 as well as GP-IEM-103, GP-IEM-105 membranes. Correlation of the steady-state diffusion-limited current due to the bromide oxidation both with its concentration in the outer solution and with the membrane thickness has been analyzed. It has been established that the transport characteristics of the bromide anion are close to each other for all homogeneous membranes under study in contact with a mixed X M NaBr +2 M H₂SO₄ solution (the value of X varies between 0.125 and 0.75): their values belong to the range from 2.6 10⁻⁶ cm² s⁻¹ to 3.4 10⁻⁶ cm² s⁻¹ for its diffusion coefficient inside membrane and to the range from 0.13 to 0.18 for its distribution coefficient at the membrane/solution boundary. Compared to the homogeneous membranes, the Br⁻ anion diffusion inside the heterogenous (Nafion XL) membrane is slower and there is a tendency to its accumulation to a larger amount. Comparison of these results for Nafion NR212 in contact with the NaBr+H₂SO₄ solution with those previously obtained for the same membrane in contact with the HBr + H₂SO₄ solution has allowed us to conclude that the applied approximate treatment of experimental data based on the theory of molecular-diffusion transport of this co-ion inside the membrane (without taking into account the migration contribution to the bromide flux owing to the suppression of the electric field by highly mobile H⁺ cations) remains applicable for systems where the NaBr concentration inside the external solution does not exceed 0. 75 M.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"988 ","pages":"Article 119139"},"PeriodicalIF":4.1,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874267","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 behavior and quantification of acetaminophen and tyrosine at clay/activated carbon composite film modified glassy carbon electrode","authors":"Marcelline Carine Ngo-Ngwem ,&nbsp;Thria Alkhaldi ,&nbsp;Guy Bertrand Tamne ,&nbsp;Justin Claude Kemmegne-Mbouguen ,&nbsp;Firmin Parfait Tchoumi ,&nbsp;Emmanuel Durand Ngambi ,&nbsp;Anayel Nzueton-Fagna ,&nbsp;Robert Mokaya","doi":"10.1016/j.jelechem.2025.119135","DOIUrl":"10.1016/j.jelechem.2025.119135","url":null,"abstract":"<div><div>A composite (namely Sa-AC) made of 2.5 % of mesoporous carbon and 97.5 % of natural Cameroonian clay was obtained using batch method. As revealed by XRD analysis, the clay within the composite retains its layer structure despite a slight decrease of interlayer space between clay sheets. The as-obtained composite has larger surface area (<em>ca</em> 111 m²/g) and high pore volume compared to the pristine clay (90 m²/g), which endowed the composite film modified glassy carbon electrode (GCE), designated as Sa-AC/GCE, with a large active surface area and fast electron transfer rate. In contrast to the bare and clay modified electrodes, the composite film modified GCE has (i) good electrocatalytic activity toward acetaminophen (Acet) and Tyrosine (Tyr) via an EC mechanism, and (ii) the reversibility of the electrooxidation of Acet was not affected by the irreversible oxidation of Tyr. Under optimal conditions, and using linear sweep voltammetry, the composite film electrodes were used to simultaneously quantify Acet and Tyr in the range of 0.2 μM to 90 μM for Acet and 0.2 μM to 32 μM for Tyr with LOD of 0.19 μM and 0.23 μM (S/N = 3); LOQ of 0.77 μM and 2.05 μM (LOD = 10 S/M), respectively. The sensitivity of Sa-AC/GCE was estimated to be 0.022 μA/μM for Acet and 0.017 μA/μM for Tyr. In addition, the Sa-AC/GCEs were successful for the quantification of Acet in pharmaceutical medicine and Tyr in a tap water with a good recovery range from 91.30 to 109.44 % for the tablets and 102.47 % for tab water.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"988 ","pages":"Article 119135"},"PeriodicalIF":4.1,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865172","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":"Boosting oxygen evolution reaction of NiCo2O3 Nanoflowers by Se incorporation","authors":"Kun Liu ,&nbsp;Long Ma ,&nbsp;Pengpeng Du ,&nbsp;Qiufang Liu ,&nbsp;Yan Yan ,&nbsp;Shaohua Wen ,&nbsp;Yuan Dang ,&nbsp;Qi Xue","doi":"10.1016/j.jelechem.2025.119134","DOIUrl":"10.1016/j.jelechem.2025.119134","url":null,"abstract":"<div><div>Developing non-noble transition metal electrocatalysts with high catalytic activity and durability is essential for the oxygen evolution reaction (OER). Herein, novel nanoflower-like Se-NiCo₂O₃ electrocatalyst (Se-NiCo₂O₃ NFs) were fabricated via a hydrothermal refluxing and high-temperature calcination strategy. The electrochemical test results demonstrated that the 7 wt% Se-NiCo₂O₃ NFs exhibit superior OER activity compared with the pristine NiCo₂O₃ NFs, requiring an overpotential of 290 mV to reach a current density of 10 mA cm⁻² along with a low Tafel slope of 56.89 mV dec⁻¹. Their superior and stable catalytic performance can be attributed to structure advantage and Se doping. The nanoflower structure provides a large specific surface area to expose abundant active sites. In addition, the doping of Se can further increase the electrical conductivity and regulate the electronic structure of metal atoms, promoting the adsorption of reaction intermediates such as OH^⁎ and enhancing the material's oxygen evolution capability. This work provides new insights and methodologies for designing efficient and stable Se-doped metal oxide electrocatalysts.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"990 ","pages":"Article 119134"},"PeriodicalIF":4.1,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906092","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":"Electrode pretreatment cycles for suppressing self-discharge of electrochemical double-layer capacitors","authors":"Woo Jung Choi,&nbsp;Hyun Ook Seo,&nbsp;Ketack Kim","doi":"10.1016/j.jelechem.2025.119133","DOIUrl":"10.1016/j.jelechem.2025.119133","url":null,"abstract":"<div><div>Self-discharge is an intrinsic property of electrochemical double-layer capacitors (EDLCs), and its elimination by any method is challenging. This study investigated ways to reduce the faradaic reaction triggers of self-discharge using simple pretreatment cycles. When the cell was operated between 0 and 2.7 V (baseline), a passivation film was formed on the electrodes, which allowed the cell to survive for a long life cycle without rapidly consuming the electrolyte. However, the passivation layer was not sufficiently firm to prevent electrolyte penetration during self-discharge. Once the electrolyte penetrated the passivation layer, electrolysis gradually eroded the charged state. Pretreatment cycles can reinforce the passivation layers with a few 2.9 or 3.1 V cutoff cycles. Cells with a 3.1 V pretreatment cycle reduced the self-discharge rate by 45 % at 26 h compared to the baseline value. This simple pretreatment method was incorporated into the passivation layer formation process, effectively suppressing self-discharge. However, the capacitance decreased slightly as the movement of ions slowed during self-discharge, which is a natural phenomenon. This study demonstrates that the electrolyte itself acts as a self-discharge trigger, serving as a Faradaic reactant. In addition, a simple method for reducing self-discharge has been reported. This suggests the need for a novel electrolyte additive that strongly suppresses electrolysis without impeding ion movement.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"988 ","pages":"Article 119133"},"PeriodicalIF":4.1,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143856123","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":"Electrodeposition of nickel layer to enhance the alkaline catalytic performance of nickel‑iron oxyhydroxide","authors":"Jing Wang ,&nbsp;Zikang Zhao ,&nbsp;Li Ji ,&nbsp;Yan Wang ,&nbsp;Ying Zhang ,&nbsp;Shan Song ,&nbsp;Junshuang Zhou ,&nbsp;Faming Gao","doi":"10.1016/j.jelechem.2025.119132","DOIUrl":"10.1016/j.jelechem.2025.119132","url":null,"abstract":"<div><div>Alkaline electrocatalysts are key to achieving cost-effective and environmentally friendly hydrogen production due to their low cost, high stability, and compatibility with renewable energy sources. This study successfully prepared a Ni@NiFeOOH/IF sample with excellent catalytic performance by electrodeposition of a nickel thin layer on NiFeOOH. The overpotentials for HER and OER of this sample were only 230 mV and 252 mV, respectively, at a current density of 500 mA cm⁻². Characterization techniques such as SEM, TEM, XRD, Raman spectroscopy, and XPS confirmed the presence of the nickel layer and its role in enhancing electron transfer rates and electrical conductivity. In an alkaline environment, the Ni@NiFeOOH/IF electrode not only exhibited outstanding HER and OER performance and good stability but also showed excellent performance in full water splitting tests under high-temperature and high-concentration conditions, offering a reliable possibility for industrial applications. This research provides a new approach for the development of efficient and stable non-noble metal water splitting catalysts.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"988 ","pages":"Article 119132"},"PeriodicalIF":4.1,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865173","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":"Carbon-coated nonstoichiometric TiOx for application of Li-ion battery anodes in fast charging-in situ XRD study","authors":"Jyun-Siang Wang ,&nbsp;Guan-Bo Liao ,&nbsp;Zhen Chong ,&nbsp;Cheng-Hsun Ho ,&nbsp;Po-Chia Huang ,&nbsp;Jow-Lay Huang ,&nbsp;Chia-Chin Chang ,&nbsp;Dipti R. Sahu ,&nbsp;Yu-Min Shen","doi":"10.1016/j.jelechem.2025.119127","DOIUrl":"10.1016/j.jelechem.2025.119127","url":null,"abstract":"<div><div>Lithium-ion batteries have emerged as a promising solution for electric vehicles, owing to their high specific capacity. However, the commonly used carbon anodes suffer from poor high-rate capability, which restricts their wider application. In this work carbon-coated nonstoichiometric TiO_x (C@TiO₁<em>.</em>₉₄₄) nanopowder was synthesized using a two-step annealing method. The performances of batteries show that the C@TiO_1.944 electrode has a remarkable initial capacity of 246.3 mAh/g with 71.5 % ICE and retains 166.2 mAh/g at a rate of 0.2C with 100 % CE and 109.0 mAh/g at 5C after formation. In contrast, the TiO<em>x</em> battery's initial capacity is 264.3 mAh/g with a 67.4 % ICE with a retention of 156.6 mAh/g at the same rate and 79.2 mAh/g at a discharge rate of 5C. Additionally, in situ X-ray diffraction (XRD) experiments was conducted with a potentiostat for elucidating the reaction mechanism which enables to track the phase transition in real-time during charge and discharge. The carbon coating protects the inner TiO<em>x</em> core from phase transition and lattice distortion occurs when Li ions are intercalated in the rutile TiO₂ matrix. The Li storage mechanism of rutile TiO₂ indicates it is not phase-transformed that can be taken as extra evidence for the high Coulombic efficiency. Further, the carbon coating enhanced the Coulombic efficiency by preventing dead Li ions while retaining in the anatase phase. The results shows that carbon-coated nonstoichiometric TiO₂ (C@TiO<em>x</em>) used in LIBs will be a solution for rapid charge application.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"988 ","pages":"Article 119127"},"PeriodicalIF":4.1,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833846","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":"Investigating proton exchange membrane electrolyzer performance under variable renewable power: Insights into voltage and stack efficiency","authors":"Majid Ali ,&nbsp;Xinfang Jin ,&nbsp;Fuqiang Liu ,&nbsp;Ertan Agar ,&nbsp;Hsi-Wu Wong ,&nbsp;Snigdha Rashinkar ,&nbsp;Mihriye Doga Tekbas","doi":"10.1016/j.jelechem.2025.119130","DOIUrl":"10.1016/j.jelechem.2025.119130","url":null,"abstract":"<div><div>This study investigates the short-term performance and efficiency of a benchtop proton exchange membrane (PEM) electrolyzer for hydrogen production under dynamic power input conditions representative of renewable energy sources. Experiments were conducted to evaluate the effects of current fluctuation characteristics—specifically frequency and standard deviation—on electrolyzer behavior. Results demonstrate that rapid and high-amplitude current fluctuations lead to increased power consumption, voltage instability, and reductions in both stack and voltage efficiency when compared to steady-state operation. Smoother current profiles, characterized by lower standard deviations and lower frequencies, improved system stability, efficiency, and hydrogen production rates. Additionally, fully transient tests using real wind power profiles revealed the highest power consumption and operational variability, underscoring the challenges posed by fluctuating renewable inputs. While the findings provide valuable insights into the immediate response of PEM electrolyzers under dynamic conditions, they are limited to short-term observations. Further long-duration studies are necessary to evaluate long-term stability and degradation effects. Overall, this research contributes to the understanding of PEM electrolyzer integration with intermittent renewable energy sources and highlights the importance of power regulation strategies for improving efficiency and operational stability in hydrogen production systems.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"988 ","pages":"Article 119130"},"PeriodicalIF":4.1,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143839399","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":"Crystallinity-controlled oxygen vacancies of SmMn2O5 as an oxygen reduction catalyst for Zn-air battery","authors":"Xiao Li ,&nbsp;Xue-wei Wang ,&nbsp;Xiao-Ran Wen ,&nbsp;Shi-qi Li ,&nbsp;Kun Zhang ,&nbsp;Jia-cheng Yu ,&nbsp;Yan Guo","doi":"10.1016/j.jelechem.2025.119129","DOIUrl":"10.1016/j.jelechem.2025.119129","url":null,"abstract":"<div><div>Mn-based mullite, with its unique structure featuring two distinct Mn coordination environments, has garnered significant attention in the research and development of oxygen reduction reaction (ORR) catalysts. The nucleation and growth of SmMn₂O₅ were influenced by controlling the hydrothermal reaction time and temperature, resulting in SmMn₂O₅ with varying degrees of crystallinity. With the increase of hydrothermal temperature and time, the crystallinity of SmMn₂O₅ is enhanced, and the morphology changes from an amorphous lamellar structure to a finer and longer nanorod structure. SmMn₂O₅ with an amorphous lamellar structure prepared at 150 °C for 3 h has a maximum specific surface area of 355.35 m² g⁻¹. The electrochemical results indicate that the amorphous lamellar SmMn₂O₅ shows excellent ORR performance with a half-wave potential of 0.76 V. This is mainly due to the fact that crystallinity induces an increase in the number of oxygen vacancies, which increases the number of active sites and changes the valence state of Mn. The amorphous lamellar SmMn₂O₅ was used as a cathode in zinc-air batteries with a power density of 119 mW/cm², showing potential applications. This work demonstrates an effective and simple strategy for increasing the number of oxygen vacancies in SmMn₂O₅, which helps the development and application of SmMn₂O₅ in the field of electrocatalysis.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"988 ","pages":"Article 119129"},"PeriodicalIF":4.1,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852299","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}