Affiliation of Author(s):材料科学与技术学院
Journal:Appl Catal A Gen
Abstract:During the research on the durability of oxygen reduction reaction (ORR) catalyst, we find the long-term stability test in perchloric acid electrolyte leads to an "activation effect" on the catalyst when using a Pt plate as the counter electrode. After 30,000 potential cycles, the carbon-based catalyst exhibits a positive shift of about 200 mV for the half-wave potential. By performing systemic characterization and analysis, we ascribe the "activation effect" to the deposition of Pt nano-particles onto the catalyst surface, which comes from the Pt dissolution during the potential cycling process. These results indicate the widely employed Pt wire/plate not suitable for the ORR test in acidic media, especially for stability test, which may bring about inaccurate or misleading judgments. In addition, this work also provides a novel method to decorate Pt particles on non-noble metal material to enhance the ORR activity by long-time potential cycling deposition. © 2019 Elsevier B.V.
ISSN No.:0926-860X
Translation or Not:no
Date of Publication:2019-01-01
Co-author:Song, Li,myo,Tao Wang,Li, Linghui,wuchao,jc,hjp
Correspondence Author:hjp,Song Lianlian