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Controlling Surface Chemical Inhomogeneity of Ni2 P/MoNiP2 /MoP Heterostructure Electrocatalysts for Efficient Hydrogen Evolution Reaction.

Authors
  • Bu, Xiuming1
  • Yin, Di2
  • Chen, Dong2
  • Quan, Quan2
  • Yang, Zhe3
  • Yip, SenPo4
  • Wong, Chun-Yuen3
  • Wang, Xianying1
  • Ho, Johnny C2, 4, 5
  • 1 CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences (SICCAS), Shanghai, 200050, P. R. China. , (China)
  • 2 Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR, 999077, P. R. China. , (China)
  • 3 Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR, 999077, P. R. China. , (China)
  • 4 Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka, 816-8580, Japan. , (Japan)
  • 5 State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Kowloon, Hong Kong SAR, 999077, P. R. China. , (China)
Type
Published Article
Journal
Small
Publisher
Wiley (John Wiley & Sons)
Publication Date
Dec 01, 2023
Volume
19
Issue
50
Identifiers
DOI: 10.1002/smll.202304546
PMID: 37626462
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Crystalline/amorphous phase engineering is demonstrated as a powerful strategy for electrochemical performance optimization. However, it is still a considerable challenge to prepare transition metal-based crystalline/amorphous heterostructures because of the low redox potential of transition metal ions. Herein, a facile H2 -assisted method is developed to prepare ternary Ni2 P/MoNiP2 /MoP crystalline/amorphous heterostructure nanowires on the conductive substrate. The characterization results show that the content of the MoNiP2 phase and the crystallinity of the MoP phase can be tuned by simply controlling the H2 concentration. The obtained electrocatalyst exhibits a superior alkaline hydrogen evolution reaction performance, delivering overpotentials of 20 and 76 mV to reach current densities of 10 and 100 mA cm-2 with a Tafel slope of 30.6 mV dec-1 , respectively. The catalysts also reveal excellent stability under a constant 100 h operation, higher than most previously reported electrocatalysts. These striking performances are ascribed to the optimized hydrogen binding energy and favorable hydrogen adsorption/desorption kinetics. This work not only exhibits the potential application of ternary Ni2 P/MoNiP2 /MoP crystalline/amorphous heterostructure nanowires catalysts for practical electrochemical water splitting, but also paves the way to prepare non-noble transition metal-based electrocatalysts with optimized crystalline/amorphous heterostructures. © 2023 Wiley-VCH GmbH.

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