ChemElectroChem最新文献_第9页

On the Stability of an Atomically-Dispersed Fe−N−C ORR Catalyst: An In Situ XAS Study in a PEMFC 原子分散的 Fe-N-C ORR 催化剂的稳定性：PEMFC 中的原位 XAS 研究

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-08-26 DOI: 10.1002/celc.202400228

Davide Menga, Yan-Sheng Li, Ana Marija Damjanović, Olivier Proux, Friedrich E. Wagner, Tim-Patrick Fellinger, Hubert A. Gasteiger, Michele Piana

{"title":"On the Stability of an Atomically-Dispersed Fe−N−C ORR Catalyst: An In Situ XAS Study in a PEMFC","authors":"Davide Menga, Yan-Sheng Li, Ana Marija Damjanović, Olivier Proux, Friedrich E. Wagner, Tim-Patrick Fellinger, Hubert A. Gasteiger, Michele Piana","doi":"10.1002/celc.202400228","DOIUrl":"10.1002/celc.202400228","url":null,"abstract":"The stability of Fe−N−C oxygen reduction reaction (ORR) electrocatalysts has been considered a primary challenge for their practical application in proton exchange membrane fuel cells (PEMFCs). While several studies have attempted to reveal the possible degradation mechanism of Fe−N−C ORR catalysts, there are few research results reporting on their stability as well as the possible Fe species formed under different voltages in real PEMFC operation. In this work, we employ in-situ X-ray absorption near-edge structure (XANES) to monitor the active-site degradation byproducts of an atomically dispersed Fe−N−C ORR catalyst under a H2/O2-operating PEMFC at 90 % relative humidity and 80 °C. For this, stability tests were carried out at two constant cell voltages, namely 0.4 and at 0.8 V. Even though the ORR activity of the Fe−N−C catalyst decreased significantly and was almost identical at the end of the tests for the two voltages employed, the analysis of the XANES recorded under H2/N2 configuration at 0.6 and 0.9 V within the stability test suggests that two different degradation mechanisms occur. They are demetalation of iron cations followed by their precipitation into Fe oxides upon operation at 0.8 V, versus a chemical carbon oxidation close to the active sites, likely triggered by reactive oxygen species (ROS) originated from the H2O2 formation, during the operation at 0.4 V.","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 18","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202400228","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142184037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gas Characterization- and Mass Spectrometry-Tools for the Analysis of Aging in Electrical Double Layer Capacitors: State-of-the-Art and Future Challenges 用于分析双电层电容器老化的气体表征和质谱工具：最新技术与未来挑战

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-08-20 DOI: 10.1002/celc.202400338

Rebecka Kost, Andrea Balducci

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Automated Optimization of the Synthesis of Alkyl Arenesulfonates in an Undivided Electrochemical Flow Cell 在不分流电化学流动池中自动优化烷基烯丙基磺酸盐的合成

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-08-19 DOI: 10.1002/celc.202400360

Maximilian M. Hielscher, Johannes Schneider, Alexander H. J. Lohmann, Prof. Dr. Siegfried R. Waldvogel

引用次数: 0

Front Cover: Electrochemical Evaluation of Penta-Coordinated Fe Phthalocyanine During the Oxygen Reduction Reaction in Various Acidic Solutions (ChemElectroChem 16/2024) 封面：五配位铁酞菁在各种酸性溶液中发生氧还原反应的电化学评价（ChemElectroChem 16/2024）

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-08-19 DOI: 10.1002/celc.202481601

César Zúñiga Loyola, Nicolás Troncoso, Angélica Gatica Caro, Federico Tasca

{"title":"Front Cover: Electrochemical Evaluation of Penta-Coordinated Fe Phthalocyanine During the Oxygen Reduction Reaction in Various Acidic Solutions (ChemElectroChem 16/2024)","authors":"César Zúñiga Loyola, Nicolás Troncoso, Angélica Gatica Caro, Federico Tasca","doi":"10.1002/celc.202481601","DOIUrl":"https://doi.org/10.1002/celc.202481601","url":null,"abstract":"The front cover picture represents a meta–air battery composed of a metal anode and a graphite cathode modified with pyridine penta-coordinated Fe phthalocyanine, which is an extremely active catalyst for the oxygen reduction reaction when the NaOH supporting electrolyte is used. When in the presence of other electrolytes, the activity of the catalyst decreases as the Fe active sites are poisoned by the interaction with the anions. Therefore, batteries with lower power density are obtained if in the presence of Cl−>Br−>HSO4−> ClO4−>NO3−>OH−. More information can be found in the Research Article by Federico Tasca and co-workers (DOI: 10.1002/celc.202400186).\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture>\u0000 </div>\u0000 </figure>\u0000 ","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 16","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202481601","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142013475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Performance of Non-Precious Metal Electrocatalysts in Proton-Exchange Membrane Fuel Cells: A Review 质子交换膜燃料电池中非贵金属电催化剂的性能：综述

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-08-13 DOI: 10.1002/celc.202400299

Srivarshini Rukmani Krishnan, Dries Verstraete, Francois Aguey-Zinsou

引用次数: 0

Electrochemical Generation of Nitrogen-centered Radicals and its Application for the Green Synthesis of Heterocycles 电化学生成以氮为中心的自由基及其在杂环化合物绿色合成中的应用

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-08-12 DOI: 10.1002/celc.202400395

Kseniia Titenkova, Daniil A. Chaplygin, Leonid L. Fershtat

{"title":"Electrochemical Generation of Nitrogen-centered Radicals and its Application for the Green Synthesis of Heterocycles","authors":"Kseniia Titenkova, Daniil A. Chaplygin, Leonid L. Fershtat","doi":"10.1002/celc.202400395","DOIUrl":"10.1002/celc.202400395","url":null,"abstract":"Electrochemistry became a unique and powerful tool for the preparation of a plethora of valuable chemical species including functional materials, drug candidates and clinically approved pharmaceuticals. Organic electrosynthesis well satisfies main goals of green chemistry development and is considered as one of the useful approaches toward the creation of sustainable future. Since nitrogen heterocyclic scaffolds still retain their importance for the construction of novel materials and medications, one of the emerging trends in organic electrochemistry is the discovery of novel green and sustainable synthetic methods toward the assembly of heterocyclic subunits. In this regard, organic electrochemistry provides an efficient platform for environmentally benign generation of various nitrogen-centered radicals which are prominent intermediates in the synthesis of nitrogen heterocycles. In this Review, recent developments in the creation of green synthetic methods for the construction of nitrogen heterocycles via electrochemical generation of nitrogen-centered radicals are summarized. The special emphasis is devoted to the influence of solvent, electrodes and electrolytes on the electrochemical step, since these crucial parameters regulate the process efficiency.","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 17","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202400395","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

pH Dependence of Noble Metals Dissolution: Gold 贵金属溶解的 pH 值依赖性：金

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-08-12 DOI: 10.1002/celc.202400373

Kevin Stojanovski, Dr. Valentín Briega-Martos, Matej Zlatar, Christian Göllner, Dr. Serhiy Cherevko

{"title":"pH Dependence of Noble Metals Dissolution: Gold","authors":"Kevin Stojanovski, Dr. Valentín Briega-Martos, Matej Zlatar, Christian Göllner, Dr. Serhiy Cherevko","doi":"10.1002/celc.202400373","DOIUrl":"10.1002/celc.202400373","url":null,"abstract":"The electrochemical applications of gold span the entire pH spectrum. Recently, gold dissolution in acidic and alkaline media has been studied, but less attention has been given to electrolytes at intermediate pH values. To address this gap, this work uses on-line electrochemical dissolution inductively coupled plasma mass spectrometry (ICP-MS) to examine gold dissolution across a pH range of 1 to 12.7 using phosphate buffer solutions. All experimental parameters, except pH, are kept constant, enabling a clear investigation of pH effects on anodic (gold oxidation) and cathodic (gold oxide reduction) dissolution processes. Results show that dissolution amounts are lowest at neutral pH values between 3 and 7, varying with the applied potential and exposure time. Anodic and cathodic dissolution dominate in acidic and alkaline electrolytes, respectively. Depending on the highest applied potentials and time exposure, the main dissolution mechanism shifts at pH=5, 7, and 9. The pH dependence of Au dissolution is proposed to be linked to the nature of gold oxides formed, the kinetics of oxide formation/reduction, gold ion redeposition, and the influence of the oxygen evolution reaction (OER) on dissolution. These results provide fundamental insights into gold dissolution under neutral pH conditions.","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 18","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202400373","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142184065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Is Cobalt in Li-Rich Layered Oxides for Li-Ion Batteries Necessary? 锂离子电池中富锂层状氧化物中的钴是否必要？

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-08-08 DOI: 10.1002/celc.202400391

Hyeongseon Choi, Annika Regitta Schuer, Hyein Moon, Georgian Melinte, Guk-Tae Kim, Jakob Asenbauer, Arefeh Kazzazi, Matthias Kuenzel, Stefano Passerini

{"title":"Is Cobalt in Li-Rich Layered Oxides for Li-Ion Batteries Necessary?","authors":"Hyeongseon Choi, Annika Regitta Schuer, Hyein Moon, Georgian Melinte, Guk-Tae Kim, Jakob Asenbauer, Arefeh Kazzazi, Matthias Kuenzel, Stefano Passerini","doi":"10.1002/celc.202400391","DOIUrl":"10.1002/celc.202400391","url":null,"abstract":"Cobalt is considered an essential element for layered cathode active materials supporting enhanced lithium-ion conductivity and structural stability. Herein, we investigated the influence of Co concentration on the physicochemical properties and electrochemical performance of lithium-rich layered oxides (LRLOs) with different Co content (Li1.2Ni0.2-x/2Mn0.6-x/2CoxO2, x=0, 0.04, and 0.08). Though the presence of Co grants structural stability to LRLOs, superior long-term cycling stability is achieved with the Co-free LRLO retaining 88.1 % of the initial specific capacity (vs. 75.9 % of Li1.2Ni0.16Mn0.56Co0.08O2) after 300 galvanostatic cycles at 250 mA g−1 (1 C). The chemical stability on the surface of LRLOs containing Co declines faster, indicating a higher bulk structural stability not being the primary determinant of the LRLOs’ cycling performance. Ex-situ investigations indicate that the superior cycling stability of Co-free LRLO is obtained by reducing the Mn-related redox at discharge, which contributes to the large degree of polarization and low energy efficiency. Finally, the full-cell configured with the optimized LRLO as cathode and graphite anode delivers an energy density of 464 Wh kg−1 at C/10, and 74.4 % and 94.3 % of retention in discharge specific capacity and average voltage at the 1000th cycle, demonstrating the applicability of Co-free LRLO for sustainable LIBs.","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 17","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202400391","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Review of Extrinsic Factors That Limit the Catalytic Performance of Transition Metal Dichalcogenides (TMDs) in Hydrogen Evolution Reactions (HER) 限制过渡金属二卤化物 (TMD) 在氢气进化反应 (HER) 中催化性能的外在因素综述

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-08-08 DOI: 10.1002/celc.202400259

Jeyavelan Muthu, Farheen Khurshid, Mario Hofmann, Ya-Ping Hsieh

{"title":"Review of Extrinsic Factors That Limit the Catalytic Performance of Transition Metal Dichalcogenides (TMDs) in Hydrogen Evolution Reactions (HER)","authors":"Jeyavelan Muthu, Farheen Khurshid, Mario Hofmann, Ya-Ping Hsieh","doi":"10.1002/celc.202400259","DOIUrl":"10.1002/celc.202400259","url":null,"abstract":"Transition metal dichalcogenides (TMDs) have garnered attention as potential catalysts for water splitting owing to their unique structures, diverse electronic properties, and composition from earth-abundant elements. While certain TMD catalysts, notably MoS2, have shown promising activity for hydrogen evolution reactions (HER), achieving performance comparable to traditional platinum catalysts remains a challenge. While significant effort has been invested into understanding the effect of TMD's structural properties, such as defectiveness and crystalline phases, recent work has emphasized the role of extrinsic factors on HER. This review summarizes the current understanding of the impact of commonly overlooked electrocatalytic effects that exhibit an enhanced importance in TMD-based HER. By combining recent advances in theoretical modeling and experimental work, we review the dominating effects of extrinsic factors including electronic resistance, interfacial barriers, surface roughness, oxidation, and valence impurities. Our work aims to provide insights into optimizing TMDs as highly efficient catalysts for HER, facilitating future advancements in hydrogen generation technology.","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 17","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202400259","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of an in situ Mediator Dosing Concept for Scanning Electrochemical Microscopy in Lithium-Ion Battery Research 为锂离子电池研究中的扫描电化学显微镜开发原位介质剂量概念

IF 3.5 4区化学

ChemElectroChem Pub Date : 2024-08-07 DOI: 10.1002/celc.202400311

Johannes Eidenschink, Prof. Frank-Michael Matysik

{"title":"Development of an in situ Mediator Dosing Concept for Scanning Electrochemical Microscopy in Lithium-Ion Battery Research","authors":"Johannes Eidenschink, Prof. Frank-Michael Matysik","doi":"10.1002/celc.202400311","DOIUrl":"10.1002/celc.202400311","url":null,"abstract":"In scanning electrochemical microscopy (SECM), the addition of a redox active species plays an essential role. Those deliberately added mediators may alter results in SECM studies. In investigations of lithium-ion battery (LIB) materials, especially of the positive electrode, the oxidation potentials of commonly used mediator substances such as ferrocene are located within the operation potential of the electrode. Thus, they possibly interfere with the regular charge/discharge processes. In situ studies are therefore in need of approaches reducing or eliminating the use of mediators. Within this publication, a novel mediator dosing (MD) concept is introduced. A capillary was closely positioned at the tip of the scanning probe. By gravity flow, stable flow rates of mediator solution of up to 32.4±0.6 μL h−1 were achieved. These low amounts were found to be sufficient to form a ferrocene zone at the probe tip enabling feedback mode SECM measurements with comparable quality to measurements directly in ferrocene solution. Proof of concept experiments were conducted by investigation of a thin-film electrode with a micro-structured surface. Furthermore, the MD concept was applied in imaging experiments of a commercially available LIB graphite electrode.","PeriodicalId":142,"journal":{"name":"ChemElectroChem","volume":"11 17","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/celc.202400311","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0