Pub Date : 2025-09-01Epub Date: 2025-05-28DOI: 10.1016/j.elecom.2025.107969
Tamás Pajkossy
Diffusion-affected charge transfer is a basic situation of electrochemical kinetics; the rate coefficients are often estimated by analyzing cyclic voltammograms. Provided that a couple of conditions hold, decoupling of diffusion and charge transfer is possible by using a recent theory leading to a linear relation of the current and its so-called semiintegral. Accordingly, a set of voltammograms of such reactions, measured with varied scan rates, can be transformed into two functions characteristic of charge transfer and diffusion separately, yielding charge transfer rate coefficients. We present here voltammograms measured on a well-known electrochemical system (gold electrode in a ferrocyanide/ferricyanide containing aqueous solution) and demonstrate the applicability of the above-mentioned linear relation; finally, we calculate the charge transfer rate coefficients as a function of the electrode potential. The main advantages and disadvantages of the analysis method are discussed, along with the limitations of the practical applicability.
{"title":"Diffusion-affected charge transfer: demonstration experiment for the linear relationship between current and its semiintegral","authors":"Tamás Pajkossy","doi":"10.1016/j.elecom.2025.107969","DOIUrl":"10.1016/j.elecom.2025.107969","url":null,"abstract":"<div><div>Diffusion-affected charge transfer is a basic situation of electrochemical kinetics; the rate coefficients are often estimated by analyzing cyclic voltammograms. Provided that a couple of conditions hold, decoupling of diffusion and charge transfer is possible by using a recent theory leading to a linear relation of the current and its so-called semiintegral. Accordingly, a set of voltammograms of such reactions, measured with varied scan rates, can be transformed into two functions characteristic of charge transfer and diffusion separately, yielding charge transfer rate coefficients. We present here voltammograms measured on a well-known electrochemical system (gold electrode in a ferrocyanide/ferricyanide containing aqueous solution) and demonstrate the applicability of the above-mentioned linear relation; finally, we calculate the charge transfer rate coefficients as a function of the electrode potential. The main advantages and disadvantages of the analysis method are discussed, along with the limitations of the practical applicability.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 107969"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Titanium iron oxide (FeTiO3) has emerged as a promising anode material for lithium-ion batteries due to its distinctive octahedral structure, natural abundance, and high theoretical specific capacity. However, practical implementation has been hindered by significant capacity fading during cycling and structural instability under high current densities. In this study, we developed an innovative solution impregnation strategy to construct a metal-organic framework (MIL-100) protective layer on FeTiO3 particles (denoted as FeTiO3-MOF). This engineered architecture effectively addresses two critical challenges: (1) suppressing active material dissolution and electrode pulverization through physical confinement, and (2) enhancing charge transfer kinetics via the formation of continuous conductive pathways. The optimized FeTiO3-MOF composite demonstrates remarkable electrochemical performance, delivering a high reversible capacity of 1077.5 mAh g−1 after 150 cycles at 0.1 A g−1 and maintaining 222 mAh g−1 after 1000 cycles at 1 A g−1 - quadruple the capacity of pristine FeTiO3 (59 mAh g−1) under identical conditions. Systematic electrochemical analysis reveals significantly improved charge transfer characteristics and lithium-ion diffusion coefficients, effectively mitigating the rapid capacity decay typically observed at elevated current densities. More importantly, this work establishes a novel self-replenishment mechanism through the rational utilization of metal ions within the MOF matrix, which dynamically compensates for active material loss during prolonged cycling. The proposed surface engineering strategy provides an effective method for developing next-generation energy storage materials that combine high capacity with exceptional cycling stability.
氧化钛铁（FeTiO3）因其独特的八面体结构、天然丰度和较高的理论比容量而成为锂离子电池极具前景的负极材料。然而，在高电流密度下，循环过程中显著的容量衰减和结构不稳定阻碍了实际实施。在本研究中，我们开发了一种创新的溶液浸渍策略，在FeTiO3颗粒（标记为FeTiO3- mof）上构建金属有机框架（MIL-100）保护层。这种工程结构有效地解决了两个关键挑战：(1)通过物理限制抑制活性物质溶解和电极粉碎，(2)通过形成连续导电途径增强电荷转移动力学。优化后的FeTiO3- mof复合材料表现出优异的电化学性能，在0.1 a g−1下循环150次可提供1077.5 mAh g−1的高可逆容量，在1 a g−1下循环1000次可保持222 mAh g−1，是相同条件下原始FeTiO3 （59 mAh g−1）容量的四倍。系统的电化学分析表明，电荷转移特性和锂离子扩散系数显著改善，有效缓解了在高电流密度下通常观察到的快速容量衰减。更重要的是，本研究通过合理利用MOF基体内的金属离子，建立了一种新的自我补充机制，动态补偿长时间循环过程中活性物质的损失。所提出的表面工程策略为开发下一代储能材料提供了一种有效的方法，该材料结合了高容量和卓越的循环稳定性。
{"title":"MOF-clad FeTiO3: Synergistic suppression of material decomposition and capacity fading in lithium-ion battery anodes","authors":"Zhipeng Yuan, Xiaohuan Wang, Congjie Yang, Xinba Yaer","doi":"10.1016/j.elecom.2025.107998","DOIUrl":"10.1016/j.elecom.2025.107998","url":null,"abstract":"<div><div>Titanium iron oxide (FeTiO<sub>3</sub>) has emerged as a promising anode material for lithium-ion batteries due to its distinctive octahedral structure, natural abundance, and high theoretical specific capacity. However, practical implementation has been hindered by significant capacity fading during cycling and structural instability under high current densities. In this study, we developed an innovative solution impregnation strategy to construct a metal-organic framework (MIL-100) protective layer on FeTiO<sub>3</sub> particles (denoted as FeTiO<sub>3</sub>-MOF). This engineered architecture effectively addresses two critical challenges: (1) suppressing active material dissolution and electrode pulverization through physical confinement, and (2) enhancing charge transfer kinetics via the formation of continuous conductive pathways. The optimized FeTiO<sub>3</sub>-MOF composite demonstrates remarkable electrochemical performance, delivering a high reversible capacity of 1077.5 mAh g<sup>−1</sup> after 150 cycles at 0.1 A g<sup>−1</sup> and maintaining 222 mAh g<sup>−1</sup> after 1000 cycles at 1 A g<sup>−1</sup> - quadruple the capacity of pristine FeTiO<sub>3</sub> (59 mAh g<sup>−1</sup>) under identical conditions. Systematic electrochemical analysis reveals significantly improved charge transfer characteristics and lithium-ion diffusion coefficients, effectively mitigating the rapid capacity decay typically observed at elevated current densities. More importantly, this work establishes a novel self-replenishment mechanism through the rational utilization of metal ions within the MOF matrix, which dynamically compensates for active material loss during prolonged cycling. The proposed surface engineering strategy provides an effective method for developing next-generation energy storage materials that combine high capacity with exceptional cycling stability.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 107998"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-07-05DOI: 10.1016/j.elecom.2025.107994
Ya Zhao , Lintao Wu , Hexiang Zhong , Lin Li , Jiaxin Fan
Polyimide electrode materials exhibit good electrochemical performance; however, their low conductivity limits their application. To address this issue, this study synthesized polyaniline-polyimide (PI@PANI) composites through chemical oxidative polymerization and solvothermal methods. The effects of the polyaniline ratio on the morphology, specific surface area, molecular weight, and electrochemical performance of the composites were investigated. The PI@PANI maintained its characteristic morphology, and when the polyaniline ratio was higher, the specific surface area of the composites increased along with the increase of high molecular weight polymers, while thermal stability slightly decreased. As an electrode material in zinc half-cells, Zn//PI@PANI (PI@PANI-2, NTCDA: ANI = 1:1) showed good cycling performance and rate capability. At a current density of 250 mA/g, after 400 cycles, the capacity retention reached as high as 90 %. Additionally, during full cell tests, the PI@PANI// MnO2 full cell maintained a high capacity retention of 86 % after 500 cycles at a current density of 200 mA/g. These results indicate that the PI@PANI composites have significant application potential in the field of electrochemical energy storage, providing theoretical guidance and experimental evidence for further optimizing the composition and structure of the composites to enhance their electrochemical performance.
聚酰亚胺电极材料具有良好的电化学性能；然而，它们的低导电性限制了它们的应用。为了解决这一问题，本研究通过化学氧化聚合和溶剂热法合成了聚苯胺-聚酰亚胺（PI@PANI）复合材料。考察了聚苯胺配比对复合材料形貌、比表面积、分子量和电化学性能的影响。PI@PANI保持了其特有的形态，当聚苯胺比例较高时，复合材料的比表面积随着高分子量聚合物的增加而增加，而热稳定性略有下降。作为锌半电池的电极材料，Zn//PI@PANI （PI@PANI-2, NTCDA: ANI = 1:1）具有良好的循环性能和倍率性能。在250 mA/g电流密度下，经过400次循环，容量保持率高达90%。此外，在全电池测试中，PI@PANI// MnO2全电池在200 mA/g电流密度下循环500次后保持86%的高容量保持率。结果表明，PI@PANI复合材料在电化学储能领域具有显著的应用潜力，为进一步优化复合材料的组成和结构以提高其电化学性能提供了理论指导和实验依据。
{"title":"Developing PI@PANI composites for aqueous zinc-ion batteries","authors":"Ya Zhao , Lintao Wu , Hexiang Zhong , Lin Li , Jiaxin Fan","doi":"10.1016/j.elecom.2025.107994","DOIUrl":"10.1016/j.elecom.2025.107994","url":null,"abstract":"<div><div>Polyimide electrode materials exhibit good electrochemical performance; however, their low conductivity limits their application. To address this issue, this study synthesized polyaniline-polyimide (PI@PANI) composites through chemical oxidative polymerization and solvothermal methods. The effects of the polyaniline ratio on the morphology, specific surface area, molecular weight, and electrochemical performance of the composites were investigated. The PI@PANI maintained its characteristic morphology, and when the polyaniline ratio was higher, the specific surface area of the composites increased along with the increase of high molecular weight polymers, while thermal stability slightly decreased. As an electrode material in zinc half-cells, Zn//PI@PANI (PI@PANI-2, NTCDA: ANI = 1:1) showed good cycling performance and rate capability. At a current density of 250 mA/g, after 400 cycles, the capacity retention reached as high as 90 %. Additionally, during full cell tests, the PI@PANI// MnO<sub>2</sub> full cell maintained a high capacity retention of 86 % after 500 cycles at a current density of 200 mA/g. These results indicate that the PI@PANI composites have significant application potential in the field of electrochemical energy storage, providing theoretical guidance and experimental evidence for further optimizing the composition and structure of the composites to enhance their electrochemical performance.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 107994"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144595510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-06-28DOI: 10.1016/j.elecom.2025.107991
Jonas Mart Linge , Xiang Lyu , Heiki Erikson , Lynda Amichi , David A. Cullen , Kaido Tammeveski , Alexey Serov
Quick and easy Ag catalysts preparation via wet chemical synthesis method using only reducing agent (pure-Ag); reducing agent and citric acid as the capping agent (Ag-CA); and carbon support (KetjenBlack 600J), capping agent, and the reducing agent (Ag/C) is demonstrated. The Ag-based electrocatalysts are characterized by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) with energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, and X-ray photoelectron spectroscopy (XPS). The electrocatalytic activity of Ag catalysts for O2 reduction reaction (ORR) in 1 M KOH is evaluated using the rotating (ring)-disc electrode method. SEM and HAADF-STEM results show that the unsupported pure-Ag and Ag-CA catalysts consist mainly of big agglomerates, and Ag/C has the smallest agglomerates and some sub-3 nm Ag nanoparticles. The XPS results reveal that Ag in all the catalysts is in the metallic form (Ag0). Despite consisting of big agglomerates, the Ag-CA catalyst exhibits similar ORR electrocatalytic activity to that of Ag/C. Ag-CA (unsupported) shows the lowest hydrogen peroxide yield. These results are of great importance for the development of Ag-based catalysts that can be prepared in a fast, simple and easily up scalable fashion, for anion exchange membrane fuel cells.
仅使用还原剂（纯银），湿法化学合成快速简便制备银催化剂还原剂和柠檬酸作为封盖剂（Ag-CA）；碳载体（KetjenBlack 600J）、封盖剂和还原剂（Ag/C）进行了论证。采用高角环形暗场扫描透射电子显微镜（HAADF-STEM）、能量色散x射线能谱（EDS）、扫描电子显微镜（SEM）、x射线衍射（XRD）和x射线光电子能谱（XPS）对银基电催化剂进行了表征。采用旋转（环）盘电极法评价了银催化剂在1 M KOH中O2还原反应（ORR）的电催化活性。SEM和HAADF-STEM结果表明，无负载的纯Ag和Ag- ca催化剂主要由大团聚体组成，Ag/C催化剂的团聚体最小，并含有一些亚3 nm的Ag纳米颗粒。XPS结果表明，所有催化剂中的Ag均以金属形式存在（Ag0）。Ag- ca催化剂虽然由大团块组成，但其ORR电催化活性与Ag/C相似。Ag-CA（无负载）的过氧化氢产率最低。这些结果对于开发快速、简单且易于扩展的银基燃料电池催化剂具有重要意义。
{"title":"Unsupported and carbon-supported silver catalysts for oxygen reduction reaction in alkaline media","authors":"Jonas Mart Linge , Xiang Lyu , Heiki Erikson , Lynda Amichi , David A. Cullen , Kaido Tammeveski , Alexey Serov","doi":"10.1016/j.elecom.2025.107991","DOIUrl":"10.1016/j.elecom.2025.107991","url":null,"abstract":"<div><div>Quick and easy Ag catalysts preparation via wet chemical synthesis method using only reducing agent (pure-Ag); reducing agent and citric acid as the capping agent (Ag-CA); and carbon support (KetjenBlack 600J), capping agent, and the reducing agent (Ag/C) is demonstrated. The Ag-based electrocatalysts are characterized by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) with energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, and X-ray photoelectron spectroscopy (XPS). The electrocatalytic activity of Ag catalysts for O<sub>2</sub> reduction reaction (ORR) in 1 M KOH is evaluated using the rotating (ring)-disc electrode method. SEM and HAADF-STEM results show that the unsupported pure-Ag and Ag-CA catalysts consist mainly of big agglomerates, and Ag/C has the smallest agglomerates and some sub-3 nm Ag nanoparticles. The XPS results reveal that Ag in all the catalysts is in the metallic form (Ag<sup>0</sup>). Despite consisting of big agglomerates, the Ag-CA catalyst exhibits similar ORR electrocatalytic activity to that of Ag/C. Ag-CA (unsupported) shows the lowest hydrogen peroxide yield. These results are of great importance for the development of Ag-based catalysts that can be prepared in a fast, simple and easily up scalable fashion, for anion exchange membrane fuel cells.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 107991"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-08-09DOI: 10.1016/j.elecom.2025.108020
H. Alwael , N.A. Asiri , B.G. Alhogbi , A.S. Alharthi , E.A. Bahaidarah , T.N. Abduljabbar , D.F. Baamer , M. Madkour , Faten M. Ali Zainy , M.S. El-Shahawi
{"title":"Corrigendum to “Probe – Integrated electrochemical sensing platform for detection of trace levels of Dapoxetine hydrochloride drug residue in water and drug formulations” [Electrochem. Commun. 173 (2025) 107875]","authors":"H. Alwael , N.A. Asiri , B.G. Alhogbi , A.S. Alharthi , E.A. Bahaidarah , T.N. Abduljabbar , D.F. Baamer , M. Madkour , Faten M. Ali Zainy , M.S. El-Shahawi","doi":"10.1016/j.elecom.2025.108020","DOIUrl":"10.1016/j.elecom.2025.108020","url":null,"abstract":"","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 108020"},"PeriodicalIF":4.2,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144858142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-05-28DOI: 10.1016/j.elecom.2025.107968
Xinjie Song , Jing Zhang , Shuang Li
Cardiovascular diseases (CVDs) continue to represent the leading cause of global mortality and disability, highlighting the urgent need for early detection, intervention, and prevention strategies to improve patient outcomes. While significant advancements have been achieved in diagnostic approaches - including clinical risk stratification and biomarker panels - the increasing prevalence of CVDs presents substantial challenges, particularly in the context of accelerating global aging populations. This situation demands the identification and clinical validation of highly sensitive circulating biomarkers that can detect early pathological changes, coupled with the development of precise analytical platforms. Electrochemical biosensors have emerged as critical diagnostic tools for CVDs, offering exceptional advantages such as sub-picomolar sensitivity, multiplexed detection capability, rapid response kinetics, and miniaturization potential. Herein, the biomarkers for cardiovascular disease and the biosensing for them were comprehensively reviewed. Firstly, the highly specific and novel biomarkers closely related to three cardiovascular diseases which can reflect the presence or severity of the disease to a certain extent. Secondly, several common types of electrochemical biosensors and their modification method were emphasized. Finally, we summarized the advantages and disadvantages of each electrochemical biosensor modification method, as well as the development trends in the future, and provided some insights for better application in clinical practice to benefit human health.
{"title":"Recent advances in biomarkers for cardiovascular diseases and biosensing precisely via modification method of electrochemical biosensor: A Review","authors":"Xinjie Song , Jing Zhang , Shuang Li","doi":"10.1016/j.elecom.2025.107968","DOIUrl":"10.1016/j.elecom.2025.107968","url":null,"abstract":"<div><div>Cardiovascular diseases (CVDs) continue to represent the leading cause of global mortality and disability, highlighting the urgent need for early detection, intervention, and prevention strategies to improve patient outcomes. While significant advancements have been achieved in diagnostic approaches - including clinical risk stratification and biomarker panels - the increasing prevalence of CVDs presents substantial challenges, particularly in the context of accelerating global aging populations. This situation demands the identification and clinical validation of highly sensitive circulating biomarkers that can detect early pathological changes, coupled with the development of precise analytical platforms. Electrochemical biosensors have emerged as critical diagnostic tools for CVDs, offering exceptional advantages such as sub-picomolar sensitivity, multiplexed detection capability, rapid response kinetics, and miniaturization potential. Herein, the biomarkers for cardiovascular disease and the biosensing for them were comprehensively reviewed. Firstly, the highly specific and novel biomarkers closely related to three cardiovascular diseases which can reflect the presence or severity of the disease to a certain extent. Secondly, several common types of electrochemical biosensors and their modification method were emphasized. Finally, we summarized the advantages and disadvantages of each electrochemical biosensor modification method, as well as the development trends in the future, and provided some insights for better application in clinical practice to benefit human health.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 107968"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-07-06DOI: 10.1016/j.elecom.2025.107995
S. Emami, M. Hasheminiasari, S.M. Masoudpanah, R. Omrani, S.P. Ghaemi
The synthesis of MnCo2O4/Ti3C2Tx composite powders was achieved through a hydrothermal method facilitated by oxalate assistance. To assess the influence of MXene levels (0, 25, and 50 wt%) on microstructure, structure, and electrochemical performance, modern characterization methods were applied in this study. The mixed manganese‑cobalt oxalates were precipitated on the layered MXene by adding a proper amount of oxalic acid to the Nitride solution. The MnCo2O4 nanoparticles were then crystallized by heat treatment at 450 °C for one hour in a nitrogen gas atmosphere. The pristine MnCo2O4 had a columnar-like morphology, which was transformed into a fine particulate microstructure by combining with MXene. These pristine MnCo2O4 powders indicated a higher specific capacitance of 1116 F g−1, significantly exceeding the 640.5 Fg−1 recorded for the pristine layered MXene. The Incorporation of 25 wt% layered MXene enhanced the specific capacitance to a remarkable 1500 Fg−1, attributed to its finer microstructure. Under a current rate of 1 Ag−1, the capacitor composed of MnCo₂O₄-25 wt% MXene//activated carbon achieved an energy density of 43.5 Wh kg−1 at a power density of 1411 W kg−1.
{"title":"Oxalate-assisted synthesis of MnCo2O4 nanoparticles on layered MXene (Ti3C2Tx) for supercapacitor application","authors":"S. Emami, M. Hasheminiasari, S.M. Masoudpanah, R. Omrani, S.P. Ghaemi","doi":"10.1016/j.elecom.2025.107995","DOIUrl":"10.1016/j.elecom.2025.107995","url":null,"abstract":"<div><div>The synthesis of MnCo<sub>2</sub>O<sub>4</sub>/Ti<sub>3</sub>C<sub>2</sub>Tx composite powders was achieved through a hydrothermal method facilitated by oxalate assistance. To assess the influence of MXene levels (0, 25, and 50 wt%) on microstructure, structure, and electrochemical performance, modern characterization methods were applied in this study. The mixed manganese‑cobalt oxalates were precipitated on the layered MXene by adding a proper amount of oxalic acid to the Nitride solution. The MnCo<sub>2</sub>O<sub>4</sub> nanoparticles were then crystallized by heat treatment at 450 °C for one hour in a nitrogen gas atmosphere. The pristine MnCo<sub>2</sub>O<sub>4</sub> had a columnar-like morphology, which was transformed into a fine particulate microstructure by combining with MXene. These pristine MnCo<sub>2</sub>O<sub>4</sub> powders indicated a higher specific capacitance of 1116 F g<sup>−1</sup>, significantly exceeding the 640.5 Fg<sup>−1</sup> recorded for the pristine layered MXene. The Incorporation of 25 wt% layered MXene enhanced the specific capacitance to a remarkable 1500 Fg<sup>−1</sup>, attributed to its finer microstructure. Under a current rate of 1 Ag<sup>−1</sup>, the capacitor composed of MnCo₂O₄-25 wt% MXene//activated carbon achieved an energy density of 43.5 Wh kg<sup>−1</sup> at a power density of 1411 W kg<sup>−1</sup>.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 107995"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-07-23DOI: 10.1016/j.elecom.2025.108010
Oluwasegun Emmanuel Ojodun, Patrick Ehi Imoisili, Tien-Chien Jen
This work studies the structural and electrochemical characteristics of nickel oxide (NiO) and nickel oxide/carbon nanotubes (NiO/CNT) nanocomposites prepared via spray pyrolysis and annealed at 350, 400, and 500 . Structural characterization using X-ray diffraction (XRD) confirms phase purity and crystallinity. The NiO and NiO/CNT samples annealed at 400 °C (400-N and 400-NCT) exhibited optimal performance. Scanning electron microscopy (SEM) images of 400-NCT revealed a compact morphology with well-dispersed CNTs across the NiO nanoparticles. From Brunauer-Emmett-Teller (BET) analysis, its specific surface area was 93.82 m2 g−1, broader than 400-N's 35.63 m2 g−1, while its pore volume was 0.43 cm3 g−1, larger than 0.13 cm3 g−1 for 400-N. Moreover, 400-NCT displayed higher specific capacitance of 745 F g−1 at 5 A g−1, better rate capability (30.7 %), and superior cycle life (109 % @ 1000 cycles) than 400-N (16.20 F g−1, 26 % rate retention, and 21 % longevity @ 1000 cycles) in 2 M KOH. From electrochemical impedance spectroscopy, 400-NCT portrayed the lowest series and charge transfer resistance (6.60 Ω; 2.28 Ω) than 400-N (7.83 Ω; 20.41 Ω), demonstrating enhanced conductivity. The synergistic combination of CNTs and NiO in the nanocomposite is responsible for the enhanced performance, which boosts the conductivity, enlarges the surface area, and optimizes the pore network for rapid ion transport and enhanced charge storage. These findings show how modifying a process parameter in a facile and affordable method like spray pyrolysis can yield optimal results, contributing to realizing Sustainable Development Goal 7 (SDG 7) of affordable and sustainable energy solutions.
{"title":"Thermal annealing-induced structural modifications and electrochemical enhancement of NiO/CNT electrodes synthesized by spray pyrolysis for high-performance supercapacitors","authors":"Oluwasegun Emmanuel Ojodun, Patrick Ehi Imoisili, Tien-Chien Jen","doi":"10.1016/j.elecom.2025.108010","DOIUrl":"10.1016/j.elecom.2025.108010","url":null,"abstract":"<div><div>This work studies the structural and electrochemical characteristics of nickel oxide (NiO) and nickel oxide/carbon nanotubes (NiO/CNT) nanocomposites prepared via spray pyrolysis and annealed at 350, 400, and 500 <span><math><mrow><msup><mrow></mrow><mo>°</mo></msup><mi>C</mi></mrow></math></span>. Structural characterization using X-ray diffraction (XRD) confirms phase purity and crystallinity. The NiO and NiO/CNT samples annealed at 400 °C (400-N and 400-NCT) exhibited optimal performance. Scanning electron microscopy (SEM) images of 400-NCT revealed a compact morphology with well-dispersed CNTs across the NiO nanoparticles. From Brunauer-Emmett-Teller (BET) analysis, its specific surface area was 93.82 m<sup>2</sup> g<sup>−1</sup>, broader than 400-N's 35.63 m<sup>2</sup> g<sup>−1</sup>, while its pore volume was 0.43 cm<sup>3</sup> g<sup>−1</sup>, larger than 0.13 cm<sup>3</sup> g<sup>−1</sup> for 400-N. Moreover, 400-NCT displayed higher specific capacitance of 745 F g<sup>−1</sup> at 5 A g<sup>−1</sup>, better rate capability (30.7 %), and superior cycle life (109 % @ 1000 cycles) than 400-N (16.20 F g<sup>−1</sup>, 26 % rate retention, and 21 % longevity @ 1000 cycles) in 2 M KOH. From electrochemical impedance spectroscopy, 400-NCT portrayed the lowest series and charge transfer resistance (6.60 Ω; 2.28 Ω) than 400-N (7.83 Ω; 20.41 Ω), demonstrating enhanced conductivity. The synergistic combination of CNTs and NiO in the nanocomposite is responsible for the enhanced performance, which boosts the conductivity, enlarges the surface area, and optimizes the pore network for rapid ion transport and enhanced charge storage. These findings show how modifying a process parameter in a facile and affordable method like spray pyrolysis can yield optimal results, contributing to realizing Sustainable Development Goal 7 (SDG 7) of affordable and sustainable energy solutions.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 108010"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144714397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-07-13DOI: 10.1016/j.elecom.2025.107997
Muhammad Hazak Arshad , Anton Peeters , Xiaolei Chen , Dominiek Reynaerts , Krishna Kumar Saxena
The demand for multifunctional and multi-material parts has driven the development of hybrid manufacturing technologies. Laser-based additive and subtractive techniques offer design flexibility but are unsuitable for smart components, high-end aerospace and biomedical applications due to thermal defects. In contrast, electrochemical additive manufacturing (ECAM) and electrochemical machining (ECM) are non-contact in nature with minimal thermal load, which can preserve material properties while enabling material accretion and removal, respectively as governed by the Faraday's laws of electrolysis. However, sequential processing with ECM and ECAM is challenging to achieve on the same platform due to different compatible process windows, electrolytes, and localisation issues.
Therefore, this study presents successful hybridisation of maskless ECM and ECAM processes on a multifunctional machine-tool, enabling bi-directional feature fabrication (via ECAM) and shaping (via ECM) in one clamp, where the process localisation is achieved by an electrolyte confining air-column. The experiments examined the influence of process parameters and investigated process compatibility to demonstrate the potential of this hybrid technique. The air column at 1.1 bar improved process localisation by reducing the ECAM feature width by 60 % in comparison to no air-confinement (0 bar). Additionally, the best surface quality of ∼0.33 μm Sa with ECAM at 5 V was achieved at 50 % duty cycle with 20 μs pulse period as voltage pulsing allowed flushing of by-products from the interelectrode gap and shorter pulses reduced gas bubbles generation. Furthermore, it was possible to demonstrate layered manufacturing and mould repair applications using appropriate process parameters to avoid stray removal and accretion during bi-directional ECM and ECAM. These results represent a significant step in hybrid electrochemical manufacturing towards realising advanced multi-material and multi-functional component applications.
{"title":"Process compatibility analysis for hybrid electrochemical removal and accretion towards a multifunctional machine-tool: An application-oriented approach","authors":"Muhammad Hazak Arshad , Anton Peeters , Xiaolei Chen , Dominiek Reynaerts , Krishna Kumar Saxena","doi":"10.1016/j.elecom.2025.107997","DOIUrl":"10.1016/j.elecom.2025.107997","url":null,"abstract":"<div><div>The demand for multifunctional and multi-material parts has driven the development of hybrid manufacturing technologies. Laser-based additive and subtractive techniques offer design flexibility but are unsuitable for smart components, high-end aerospace and biomedical applications due to thermal defects. In contrast, electrochemical additive manufacturing (ECAM) and electrochemical machining (ECM) are non-contact in nature with minimal thermal load, which can preserve material properties while enabling material accretion and removal, respectively as governed by the Faraday's laws of electrolysis. However, sequential processing with ECM and ECAM is challenging to achieve on the same platform due to different compatible process windows, electrolytes, and localisation issues.</div><div>Therefore, this study presents successful hybridisation of maskless ECM and ECAM processes on a multifunctional machine-tool, enabling bi-directional feature fabrication (via ECAM) and shaping (via ECM) in one clamp, where the process localisation is achieved by an electrolyte confining air-column. The experiments examined the influence of process parameters and investigated process compatibility to demonstrate the potential of this hybrid technique. The air column at 1.1 bar improved process localisation by reducing the ECAM feature width by 60 % in comparison to no air-confinement (0 bar). Additionally, the best surface quality of ∼0.33 μm Sa with ECAM at 5 V was achieved at 50 % duty cycle with 20 μs pulse period as voltage pulsing allowed flushing of by-products from the interelectrode gap and shorter pulses reduced gas bubbles generation. Furthermore, it was possible to demonstrate layered manufacturing and mould repair applications using appropriate process parameters to avoid stray removal and accretion during bi-directional ECM and ECAM. These results represent a significant step in hybrid electrochemical manufacturing towards realising advanced multi-material and multi-functional component applications.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 107997"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-06-29DOI: 10.1016/j.elecom.2025.107992
R. Talei, S.M. Masoudpanah, M. Hasheminiasari, H. Nasrinpour
Na3V2(PO4)3/C powders were prepared using a solution technique with cetyltrimethylammonium bromide (CTAB) in various solvents, including ethanol, methanol, and glycerol. The impact of the solvent choice on the structural, microstructural, and electrochemical properties was elucidated by X-ray diffractometry, Raman spectroscopy, electron microscopy, galvanostatic charge-discharge, and electrochemical impedance spectroscopy methods. Single-phase Na3V2(PO4)3 (NVP) powders were achieved by calcining at 850 °C for 6 h, irrespective of the solvent type. Decomposition of the CTAB agent resulted in a carbon layer over the nearly spherical NVP particles. The methanol solvent revealed a finer particle size, leading to superior electrochemical performance, such as a capacity retention of 82 % after 50 cycles at a 1C current rate and a rate capability of 71.63 % when increasing the current rate from 0.1C to 1C. The superior quality carbon layer on the NVP particles, achieved by the methanol solvent, played a key role in the enhanced electrochemical performance.
{"title":"Effect of solvent type on solution synthesis of Na3V2(PO4)3/C cathode material for Na storage","authors":"R. Talei, S.M. Masoudpanah, M. Hasheminiasari, H. Nasrinpour","doi":"10.1016/j.elecom.2025.107992","DOIUrl":"10.1016/j.elecom.2025.107992","url":null,"abstract":"<div><div>Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>/C powders were prepared using a solution technique with cetyltrimethylammonium bromide (CTAB) in various solvents, including ethanol, methanol, and glycerol. The impact of the solvent choice on the structural, microstructural, and electrochemical properties was elucidated by X-ray diffractometry, Raman spectroscopy, electron microscopy, galvanostatic charge-discharge, and electrochemical impedance spectroscopy methods. Single-phase Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> (NVP) powders were achieved by calcining at 850 °C for 6 h, irrespective of the solvent type. Decomposition of the CTAB agent resulted in a carbon layer over the nearly spherical NVP particles. The methanol solvent revealed a finer particle size, leading to superior electrochemical performance, such as a capacity retention of 82 % after 50 cycles at a 1C current rate and a rate capability of 71.63 % when increasing the current rate from 0.1C to 1C. The superior quality carbon layer on the NVP particles, achieved by the methanol solvent, played a key role in the enhanced electrochemical performance.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 107992"},"PeriodicalIF":4.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144534282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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