Influence of electrodeposition regime and Sn:Pd ratios in Sn-Pd electrocatalysts on ethanol oxidation reaction

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-06-26 DOI:10.20450/mjcce.2023.2702

J. Lović, N. Nikolić, P. Živković, S. Dimitrijević, M. Stevanović

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引用次数: 0

Abstract

A series of bimetallic Sn-Pd catalysts were prepared by a template-free two step electrodeposition method. According to this method, Sn was electrodeposited firstly in potentiostatic or galvanostatic regime on Cu electrodes in the form of dendrites, then Pd was galvanostatically electrodeposited in the second step on the electrode with the electrodeposited Sn dendrites. The produced Sn-Pd electrocatalysts were compared with an electrocatalyst obtained by Pd electrodeposition on a bare Cu electrode. The morphological and elemental analysis of Sn-Pd and Pd electrocatalysts was performed by means of scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) techniques. The dendrites of various shapes and degree of branching were obtained by Sn deposition depending on electrodeposition regime, while Pd was electrodeposited in a form of compact Pd islands on both Sn dendrites and the Cu electrode. Cyclic voltammetry (CV) was applied for the electrochemical examination of Sn-Pd and Pd catalysts towards the ethanol oxidation reaction (EOR) in the alkaline solution. The electrocatalyst Sn0.6-Pd0.4 with an atomic ratio of 60 at.% Sn-40 at.% Pd showed higher oxidation efficiency and better tolerance towards intermediate species in EOR than the other examined electrocatalysts . It was shown that the lower fraction of Pd, relative to Sn, was crucial to achieving optimal synergy of Sn with Pd thus contributing to enhanced electrochemical behavior regarding EOR.

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Sn-Pd电催化剂中电沉积方式和Sn:Pd比对乙醇氧化反应的影响

采用无模板两步电沉积法制备了一系列双金属Sn-Pd催化剂。根据该方法，首先在恒电位或恒电流状态下以枝晶的形式在Cu电极上电沉积Sn，然后在第二步中用电沉积的Sn枝晶在电极上恒电流电沉积Pd。将制备的Sn-Pd电催化剂与通过在裸Cu电极上电沉积Pd获得的电催化剂进行比较。利用扫描电子显微镜（SEM）和能谱仪（EDS）技术对Sn-Pd和Pd电催化剂进行了形态和元素分析。根据电沉积制度，通过Sn沉积获得了各种形状和分支程度的枝晶，而Pd以致密的Pd岛的形式电沉积在Sn枝晶和Cu电极上。应用循环伏安法（CV）对Sn-Pd和Pd催化剂在碱性溶液中的乙醇氧化反应（EOR）进行了电化学检测。原子比为60at.%Sn-40at.%Pd的电催化剂Sn0.6-Pd0.4在EOR中表现出比其他所研究的电催化剂更高的氧化效率和对中间物种更好的耐受性。结果表明，相对于Sn，较低的Pd分数对于实现Sn与Pd的最佳协同作用至关重要，从而有助于增强EOR的电化学行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.