Journal
JOURNAL OF CATALYSIS
Volume 383, Issue -, Pages 164-171Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2020.01.024
Keywords
Mesoporous; HEAs; ORR; Electrocatalysis; Fuel cells
Categories
Funding
- National Natural Science Foundation of China [51702031, 51871077, 61704096]
- Shenzhen Fundamental Research Program [J0120180306171644942, JCYJ20180507184623297, KQJ5CX20180328165656256]
- Innovation project from Harbin Institute of Technology
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Pt-based alloys have been widely used as high-performance electrocatalysts for the oxygen reduction reaction (ORR). These catalysts contained high Pt contents, typically 60-70 at.% or higher, since further decreasing Pt contents would significantly lower the desired electro-catalytic activity. High-entropy alloys (HEAs) with built-in stability through their low free-energy phases provided a promising route to prepare Pt-based alloy catalysts with less than 50 at.% Pt while maintaining high ORR activity and stability in various environments. In this work, we reported a top-down de-alloying synthetic method to controllably incorporate five immiscible metals in one nanoscale solid phase. By predetermining four elements (Al, Cu, Ni and Pt) and alternating the fifth element including Pd, V, Co, Mn, etc., a series of nanoporous HEAs (np-HEAs) with Pt content of similar to 20-30 at.% were obtained. Among these quinary alloys, the Al-Cu-Ni-Pt-Mn np-HEA exhibited the best ORR catalytic activity and electrochemical cycling durability, well exceeding the commercial Pt/C catalysts. We expected these nanostructured HEA would offer a new class of alloy catalysts in many electrochemical reactions. (C) 2020 Elsevier Inc. All rights reserved.
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