Enhanced stability and efficiency of Pd electrocatalysts towards electrooxidation of ethanol using CNT–CNF supporting materials

IF 1.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Bulletin of Materials Science Pub Date : 2023-09-02 DOI:10.1007/s12034-023-03006-1

Siyamthanda H Mnyipika, Olayemi J Fakayode, Bulelwa Ntsendwana, Alex T Kuvarega, Edward N Nxumalo

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Abstract

Pd electrocatalysts supported on carbon nanotubes (CNTs) and carbon nanofibres (CNFs) and their combination thereof were evaluated for their effective ethanol oxidation reaction. The electrocatalysts (namely Pd/CNT, Pd/CNF and Pd/CNT-CNF) were synthesized and characterized using BET, TEM, XRD, TGA and Raman spectroscopy techniques. Electrochemical characterization using cyclic voltammetry in the presence of [Fe(CN)₆]^3/−4 redox probe showed that the electrocatalysts exhibited excellent current response on glassy carbon electrode in the order of Pd/CNT > Pd/CNF > Pd/CNT-CNF. In contrast, in alkaline ethanolic solution, the order of oxidative current response was Pd/CNF < Pd/CNT < Pd/CNT-CNF, implying better electrocatalytic activity for the ternary electrocatalysts. The superiority of Pd/CNT-CNF over other electrocatalysts was further revealed using chronoamperometry (current density: 51.52, 13.31 and 11.25 mA cm⁻² for Pd/CNT-CNT, Pd/CNF and Pd/CNT, respectively). Furthermore, the ternary electrocatalysts demonstrated excellent stability after 1500 cycles, making it attractive as a durable electrode for fuel cell technology development.

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利用CNT-CNF载体材料增强Pd电催化剂对乙醇电氧化的稳定性和效率

考察了碳纳米管(CNTs)和碳纳米纤维(CNFs)负载的钯电催化剂及其组合对乙醇氧化反应的影响。合成了Pd/CNT、Pd/CNF和Pd/CNT-CNF三种电催化剂，并利用BET、TEM、XRD、TGA和拉曼光谱技术对其进行了表征。用循环伏安法对[Fe(CN)6]3/−4氧化还原探针进行了电化学表征，结果表明，电催化剂在Pd/CNT >顺序的玻碳电极上表现出优异的电流响应;Pd / CNF比;Pd / CNT-CNF。而在碱性乙醇溶液中，氧化电流响应顺序为Pd/CNF <Pd /问& lt;Pd/CNT-CNF，表明三元电催化剂具有更好的电催化活性。通过计时电流法进一步揭示了Pd/CNT-CNF比其他电催化剂的优越性(Pd/CNT-CNT、Pd/CNF和Pd/CNT的电流密度分别为51.52、13.31和11.25 mA cm−2)。此外，三元电催化剂在1500次循环后表现出优异的稳定性，使其成为燃料电池技术发展的耐用电极。

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来源期刊

Bulletin of Materials Science 工程技术-材料科学：综合

CiteScore

3.40

自引率

5.60%

发文量

209

审稿时长

11.5 months

期刊介绍： The Bulletin of Materials Science is a bi-monthly journal being published by the Indian Academy of Sciences in collaboration with the Materials Research Society of India and the Indian National Science Academy. The journal publishes original research articles, review articles and rapid communications in all areas of materials science. The journal also publishes from time to time important Conference Symposia/ Proceedings which are of interest to materials scientists. It has an International Advisory Editorial Board and an Editorial Committee. The Bulletin accords high importance to the quality of articles published and to keep at a minimum the processing time of papers submitted for publication.