Electrochemical science advances最新文献_第10页

Substrate and pH-dependent homogeneous electrocatalysis using riboflavin for oxygen reduction 底物和ph依赖均相电催化使用核黄素氧还原

Electrochemical science advances Pub Date : 2022-02-02 DOI: 10.1002/elsa.202100211

Elisabeth Leeb, Dominik Wielend, Corina Schimanofsky, Niyazi Serdar Sariciftci

引用次数: 0

Impact of catalyst support morphology on 3D electrode structure and polymer electrolyte membrane fuel cell performance 催化剂载体形态对三维电极结构和聚合物电解质膜燃料电池性能的影响

Electrochemical science advances Pub Date : 2022-01-18 DOI: 10.1002/elsa.202100121

Benedikt Peter, Daniela Stoeckel, Torsten Scherer, Christian Kuebel, Christina Roth, Julia Melke

{"title":"Impact of catalyst support morphology on 3D electrode structure and polymer electrolyte membrane fuel cell performance","authors":"Benedikt Peter, Daniela Stoeckel, Torsten Scherer, Christian Kuebel, Christina Roth, Julia Melke","doi":"10.1002/elsa.202100121","DOIUrl":"https://doi.org/10.1002/elsa.202100121","url":null,"abstract":"Porous carbon-based electrodes are frequently applied in electrochemical energy technologies, for instance in fuel cells and redox flow batteries. In previous work, we observed that the final structure of a fuel cell electrode is dominated by both the morphology of the support material and its processing into a 3D porous structure. Herein, the impact of catalyst support morphology on the performance of polymer electrolyte membrane fuel cells was studied comparing carbon-supported platinum catalysts only differing in the shape of the carbon support material with otherwise similar features. Carbon-supported Pt catalysts were obtained by carbonization of polyaniline (PANI) in long fibrous, short fibrous, and granular shape. The chemical identity of the PANI precursors was demonstrated by FTIR spectroscopy and elemental analysis (EA). The final carbon-supported platinum catalysts were characterized by EA, Raman spectroscopy, XRD, and TEM exhibiting similar degree of carbonization, nanoparticle size, and nanoparticle dispersion. The effect of support morphology and the resulting differences in the 3D structure of the porous electrode were investigated by focused ion beam-scanning electron microscopy slice and view technique and correlated to their fuel cell performance.","PeriodicalId":93746,"journal":{"name":"Electrochemical science advances","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/elsa.202100121","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50152000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Conversion of a CO–CO2 co-feed with a porous tubular copper catalyst at low potential 低电势下用多孔管状铜催化剂转化CO–CO2共进料

Electrochemical science advances Pub Date : 2022-01-12 DOI: 10.1002/elsa.202100198

Anne Clara Sustronk, Nieck Edwin Benes, Guido Mul

{"title":"Conversion of a CO–CO2 co-feed with a porous tubular copper catalyst at low potential","authors":"Anne Clara Sustronk, Nieck Edwin Benes, Guido Mul","doi":"10.1002/elsa.202100198","DOIUrl":"10.1002/elsa.202100198","url":null,"abstract":"In the electrochemical reduction of CO2, copper electrodes are well known to be active and selective for a variety of products, depending on process conditions. However, the effect of feed composition on performance has not been extensively investigated, especially with respect to the conversion of CO2 to CO. We now show for copper electrodes in a porous tubular configuration (Hollow Fibre Electrodes, HFEs) at a relatively low working potential (−1.1 V vs Ag/AgCl), that an increasing concentration of CO in the feed results in a decreasing CO2 conversion rate to CO. Contrary, it is observed that the concomitant hydrogen production rate does not depend on the concentration of CO in the feed. These observations are in good agreement with thermodynamic predictions applying the equation for the Gibbs energy of reaction. On the basis of this conclusion, we anticipate that mass transfer limitations are minimized by the tubular morphology and flow-through mode of operation. Most importantly, this study shows the necessity of a low CO concentration in the feed, to obtain a high CO2 conversion rate.","PeriodicalId":93746,"journal":{"name":"Electrochemical science advances","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/elsa.202100198","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45292759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulation-based guidance for improving CO 2 ${rm CO}_{2}$ reduction on silver gas diffusion electrodes 基于模拟的改进银气体扩散电极上CO2$｛rm CO｝_｛2｝$还原的指南

Electrochemical science advances Pub Date : 2022-01-07 DOI: 10.1002/elsa.202100160

Matthias Heßelmann, Berinike Clara Bräsel, Robert Gregor Keller, Matthias Wessling

{"title":"Simulation-based guidance for improving \u0000 \u0000 \u0000 CO\u0000 2\u0000 \u0000 ${rm CO}_{2}$\u0000 reduction on silver gas diffusion electrodes","authors":"Matthias Heßelmann, Berinike Clara Bräsel, Robert Gregor Keller, Matthias Wessling","doi":"10.1002/elsa.202100160","DOIUrl":"https://doi.org/10.1002/elsa.202100160","url":null,"abstract":"The reduction of <math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>CO</mi>\u0000 <mn>2</mn>\u0000 </msub>\u0000 <annotation>${rm CO}_{2}$</annotation>\u0000 </semantics></math> in an electrochemical reactor using electrical energy is a promising approach to implement a more sustainable carbon economy and to replace fossil fuels with renewable carbon sources. Conventionally used solid plate electrodes are limited by poor mass transport of the reactants. Gas diffusion electrodes (GDEs) can overcome this limitation and have gained industrial relevance during the last decades. A comprehensive understanding of transport and conversion phenomena within such porous electrodes is not yet well developed. Here, we report a one-dimensional steady state model of the GDE to investigate the influence of relevant operational parameters and GDE properties on <math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>CO</mi>\u0000 <mn>2</mn>\u0000 </msub>\u0000 <annotation>${rm CO}_{2}$</annotation>\u0000 </semantics></math> reduction. The results indicate the importance of controlling the local reaction environment, that is, the reactant concentration and the pH value, by tuning the electrolyte and gas composition, and flow rate as well as the catalyst layer properties.","PeriodicalId":93746,"journal":{"name":"Electrochemical science advances","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/elsa.202100160","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50123744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Simulation‐based guidance for improving CO2 reduction on silver gas diffusion electrodes 基于模拟的指导提高二氧化碳在银气体扩散电极上的减少

Electrochemical science advances Pub Date : 2022-01-07 DOI: 10.1002/elsa.202100160

Matthias Heßelmann, B. Bräsel, R. Keller, Matthias Wessling

引用次数: 8

Ambipolar diarylnitroxides: Molecular design and electrochemical testing 双极性二芳基氮氧化物:分子设计和电化学测试

Electrochemical science advances Pub Date : 2022-01-02 DOI: 10.1002/elsa.202100182

Tatiana Magdesieva

引用次数: 0

Cathodic corrosion of Au in aqueous methanolic alkali metal hydroxide electrolytes: Notable role of water Au在甲醇-碱金属氢氧化物水溶液中的阴极腐蚀：水的显著作用

Electrochemical science advances Pub Date : 2021-12-28 DOI: 10.1002/elsa.202100175

Mohamed M. Elnagar, Timo Jacob, Ludwig A. Kibler

{"title":"Cathodic corrosion of Au in aqueous methanolic alkali metal hydroxide electrolytes: Notable role of water","authors":"Mohamed M. Elnagar, Timo Jacob, Ludwig A. Kibler","doi":"10.1002/elsa.202100175","DOIUrl":"10.1002/elsa.202100175","url":null,"abstract":"Cathodic corrosion is an electrochemical process that induces restructuring, roughening, and etching of metal surfaces at a highly negative surface charge density, yet, details of the reaction mechanism are not fully resolved. An in-depth fundamental understanding of the processes and parameters underlying cathodic corrosion is crucial for tailoring the surface structure of the metal electrodes and for synthesizing shape- and size-controlled nanoparticles. Here, we investigate the relevance of water and hydrogen evolution in the cathodic corrosion process. To achieve this aim, Au electrodes were polarized at -1.6 V versus RHE in KOH and NaOH electrolytes prepared using different water + methanol mixtures. Structural changes of the Au surfaces were studied by cyclic voltammetry and monitored by scanning electron microscopy (SEM). Most importantly, cathodic corrosion does not take place in the absence of water. There is no detectable bubble formation due to the hydrogen evolution reaction on Au in purely methanolic alkali. Furthermore, the electrochemically active surface area, facet distribution, and surface morphology of Au electrodes are significantly altered upon cathodic polarization as a function of the water concentration. Cathodic corrosion features become more and more pronounced with a further increase in water content. In addition, substantial differences in the surface structure of Au are observed as a function of the nature and concentration of alkali metal cations. Overall, this study provides a more detailed understanding of the role of water and the hydrogen evolution reaction in dominating cathodic corrosion, which might advance the understanding of this phenomenon.","PeriodicalId":93746,"journal":{"name":"Electrochemical science advances","volume":"2 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/elsa.202100175","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48598420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Advances in electrochemical detection methods for measuring contaminants of emerging concerns 用于测量新出现的污染物的电化学检测方法的进展

Electrochemical science advances Pub Date : 2021-12-27 DOI: 10.1002/elsa.202100184

Mohamed H. Hassan, Reem Khan, Silvana Andreescu

{"title":"Advances in electrochemical detection methods for measuring contaminants of emerging concerns","authors":"Mohamed H. Hassan, Reem Khan, Silvana Andreescu","doi":"10.1002/elsa.202100184","DOIUrl":"10.1002/elsa.202100184","url":null,"abstract":"The presence of contaminants of emerging concerns (CECs) such as pharmaceuticals and personal care products, endocrine disrupting compounds (EDCs), per/poly-fluorinated substances (PFAS), pesticides, and nanomaterials poses significant challenges to the environment and human health. This review discusses the current status of electrochemical sensing methods and their potential as low-cost analytical platforms for the detection and characterization of emerging contaminants. Recent developments in advanced materials and fabrication techniques such as electrophoretic deposition, layer-by-layer deposition, roll-to-roll and 3D printing techniques, and the scalable manufacturing of low-cost portable electrochemical devices are discussed. Examples of detection mechanisms, electrode modification procedures, device configuration, and their performance along with recent developments in fundamental electrochemistry, particularly nanoimpact methods, are provided to demonstrate the capabilities of these methods for the environmental monitoring of CECs. Finally, a critical discussion of future research needs, detection challenges, and opportunities is provided to demonstrate how electrochemistry can be used to advance field monitoring of these chemicals. These methods can be used as complementary or alternative methods to the currently used laboratory-based analytical instrumentation to facilitate large-scale studies and manage risks associated with the presence of CECs in the environment and other matrices.","PeriodicalId":93746,"journal":{"name":"Electrochemical science advances","volume":"2 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/elsa.202100184","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41287622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Functional activity of peptide ion channels in tethered bilayer lipid membranes: Review 肽离子通道在栓系双层脂质膜中的功能活性：综述

Electrochemical science advances Pub Date : 2021-12-27 DOI: 10.1002/elsa.202100180

Rolando Guidelli, Lucia Becucci

{"title":"Functional activity of peptide ion channels in tethered bilayer lipid membranes: Review","authors":"Rolando Guidelli, Lucia Becucci","doi":"10.1002/elsa.202100180","DOIUrl":"10.1002/elsa.202100180","url":null,"abstract":"Ion transport across biomembranes plays a major role in living cells. This fundamental function is normally carried out by molecules with both a hydrophobic and a hydrophilic side (amphiphilic molecules), which aggregate within the membrane forming a hydrophilic pore (the ion channel) permitting the selective translocation of permeant ions. Countless papers report the conformation of these ion channels in lipid vesicles using several techniques, such as circular dichroism and solid-state NMR spectroscopies. However, the functional activity of ion channels can only be investigated by varying the transmembrane potential. This is also the situation in which ion channels operate in commercialized drugs with intracellular targeting activities, of great interest in pharmaceutical research. A suitable biomimetic membrane must consist of a conducting or semiconducting support, whose “heart” is a lipid bilayer in contact with the aqueous solution of interest on one side. The other side must comprise a hydrophilic region thick enough to completely decouple the lipid bilayer from the support, giving rise to a “tethered bilayer lipid membrane” (tBLM). This review aims to describe the numerous efforts made over time to approach this goal, the most recent achievements, and the perspectives of future development. Special emphasis will be placed on the electrochemical aspects of tBLMs, and a qualitative overview of the main optical and scanning probe techniques employed will be provided.","PeriodicalId":93746,"journal":{"name":"Electrochemical science advances","volume":"2 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/elsa.202100180","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47260613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Carbon doped selenium electrocatalyst toward CO2 reduction to chemical fuels 碳掺杂硒电催化剂用于化学燃料中CO 2的还原

Electrochemical science advances Pub Date : 2021-12-23 DOI: 10.1002/elsa.202100098

Debabrata Chanda, Suddhasatwa Basu

引用次数: 2