Influence of counter electrode material during accelerated durability test of non-precious metal electrocatalysts in acidic medium

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• 作者：Jia Li^a ; Huiyuan Liu^b ; Yang Lü ; ^a ; Xinwen Guo^a ; Yujiang Song^a ; ^{yjsong@dlut.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Non-precious metal electrocatalyst ; Platinum counter electrode ; Graphite counter electrode ; Accelerated durability test ; Acid medium
• 刊名：Chinese Journal of Catalysis
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：37
• 期：7
• 页码：1109-1118
• 全文大小：1648 K

文摘

Significant progress has been made in the development of non-precious metal electrocatalysts (NPMEs) during the past decade. Correspondingly, there is an urgent demand for an appropriate measurement method to be established for the reliable evaluation of NPMEs. In this study, platinum and graphite counter electrodes were used to investigate the impact of counter electrode material on the accelerated durability testing (ADT) of NPMEs in acidic medium. Platinum used as the counter electrode in a traditional three-electrode electrochemical cell was found to dissolve in acidic medium and re-deposit on NPME coated on the working electrode during ADT. Such re-deposition causes the oxygen reduction reaction (ORR) performance of NPMEs to remarkably improve, and thus will seriously mislead our judgment of NPMEs if we are unaware of it. The phenomenon can be avoided using a graphite counter electrode.