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High Entropy Alloys (HEAs) are a versatile material with unique properties, tailored for various applications. They enable pH-sensitive electrocatalytic transformations like hydrogen evolution reaction (HER) and hydrogen oxidation reactions (HOR) in alkaline media. Mesoporous nanostructures with high surface area are preferred for these electrochemical reactions, but designing mesoporous HEA sis challenging. To overcome this challenge, a low-temperature triblock copolymer-assisted wet-chemical approach is developed to produce mesoporous HEA nanospheres composed of PtPdRuMoNi systems with sufficient entropic mixing. Owing to active sites with inherent entropic effect, mesoporous features, and increased accessibility, optimized HEA nanospheres promote strong HER/HOR performance in alkaline medium. At 30 mV nominal overpotential, it exhibits a mass activity of ≈167 (HER) and 151 A gPt−1 (HOR), far exceeding commercial Pt-C electrocatalysts (34 and 48 A gPt−1) and many recently reported various alloys. The Mott-Schottky analysis reveals HEA nanospheres inherit high charge carrier density, positive flat band potential, and smaller charge transfer barrier, resulting in better activity and faster kinetics. This micelle-assisted synthetic enable the exploration of the compositional and configurational spaces of HEAs at relatively low temperature, while simultaneously facilitating the introduction of mesoporous nanostructures for a wide range of catalytic applications.

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• Creative Commons BY Attribution 4.0 International
  

  This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited

Keyword: High entropy alloy, hydrogen evolution, hydrogen oxidation, Mesoporous

Date published: 2024-07-19

Publisher: Wiley

Journal:

• Advanced Science (ISSN: 21983844) vol. 35 issue. 11 2402518

Funding:

• Exploratory Research for Advanced Technology JPMJER2003
• Japan Society for the Promotion of Science P22063
• National Research Foundation of Korea
• Nagoya University

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1002/advs.202402518

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Updated at: 2025-01-25 08:30:48 +0900

Published on MDR: 2025-01-25 08:30:48 +0900