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Nanostructures Ni2P / MoP @ N - doping porous carbon for efficient hydrogen evolution over a broad pH range

Authors
  • Xu, Yuelong
  • Yan, Meifang
  • Liu, Zhan
  • Wang, Jingyue
  • Zhai, Zuozhao
  • Ren, Bin
  • Dong, Xiaoxi
  • Miao, Junfeng
  • Liu, Zhenfa
Publication Date
Dec 10, 2020
Source
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
Keywords
License
Unknown
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Abstract

Given its clean energy and absence of exhaust gases, hydrogen is an ideal candidate for energy demand. Electrochemical hydrogen evolution reaction (HER) have attracted increasing attention, and non-precious metal compounds have been considered as next-generation catalysts to replace the traditional Pt-based catalysts in this reaction. This study adopts a novel sol-gel method of chitosan and formaldehyde to prepare an N-doped carbon matrix with Nickel phosphide (Ni2P) and Molybdenum phosphide (MoP) loading. Phytic acid is used as the P source to dissolve chitosan. The interface between Ni2P and MoP in the as-prepared catalysts facilitates HER with an excellent stability in a wide pH universal solution. The onset potentials of the catalyst are 300, 200, and 5 mV in 0.5 mol L-1 sulfuric acid, 1.0 mol L-1 phosphate buffer solution, and 1.0 mol L-1 potassium hydroxide, respectively, and the corresponding Tafel slopes are 63, 99, and 64 mV dec(-1). Density functional theory is adopted to support the experiment. Results suggest that the synergistic effect from the interface can obviously reduce the hydrogen adsorption free energy to benefit the adsorption/desorption. (C) 2020 Elsevier Ltd. All rights reserved.

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