Coherent hexagonal platinum skin on nickel nanocrystals for enhanced hydrogen evolution activity

Kai Liu, Hao Yang, Yilan Jiang, Zhaojun Liu, Shumeng Zhang, Zhixue Zhang, Zhun Qiao, Yiming Lu, Tao Cheng (), Osamu Terasaki, Qing Zhang () and Chuanbo Gao ()
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Kai Liu: Xi’an Jiaotong University
Hao Yang: Soochow University
Yilan Jiang: ShanghaiTech University
Zhaojun Liu: Xi’an Jiaotong University
Shumeng Zhang: Xi’an Jiaotong University
Zhixue Zhang: Xi’an Jiaotong University
Zhun Qiao: Xi’an Jiaotong University
Yiming Lu: Soochow University
Tao Cheng: Soochow University
Osamu Terasaki: ShanghaiTech University
Qing Zhang: ShanghaiTech University
Chuanbo Gao: Xi’an Jiaotong University

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Metastable noble metal nanocrystals may exhibit distinctive catalytic properties to address the sluggish kinetics of many important processes, including the hydrogen evolution reaction under alkaline conditions for water-electrolysis hydrogen production. However, the exploration of metastable noble metal nanocrystals is still in its infancy and suffers from a lack of sufficient synthesis and electronic engineering strategies to fully stimulate their potential in catalysis. In this paper, we report a synthesis of metastable hexagonal Pt nanostructures by coherent growth on 3d transition metal nanocrystals such as Ni without involving galvanic replacement reaction, which expands the frontier of the phase-replication synthesis. Unlike noble metal substrates, the 3d transition metal substrate owns more crystal phases and lower cost and endows the hexagonal Pt skin with substantial compressive strains and programmable charge density, making the electronic properties particularly preferred for the alkaline hydrogen evolution reaction. The energy barriers are greatly reduced, pushing the activity to 133 mA cmgeo–2 and 17.4 mA μgPt–1 at –70 mV with 1.5 µg of Pt in 1 M KOH. Our strategy paves the way for metastable noble metal catalysts with tailored electronic properties for highly efficient and cost-effective energy conversion.

Date: 2023
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DOI: 10.1038/s41467-023-38018-2

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