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Research Article

Construction of pH-universal hydrogen evolution freeway in MoO3-MoNi4@Cu core–shell nanowires via synergetic electronic and geometric effect

Xiaodong Chen1, Shoufu Cao1, Xiaojing Lin1, Xiaofei Wei1, Zhaojie Wang1( ), Hongyu Chen2, Chengcheng Hao1, Siyuan Liu1( ), Shuxian Wei2, Daofeng Sun1, Xiaoqing Lu1( )
School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China
College of Science, China University of Petroleum (East China), Qingdao 266580, China
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Graphical Abstract

One-dimensional (1D) core–shell MoO3-MoNi4@Cu NWs catalyst optimized by synergetic electronic and geometric effect exhibits excellent hydrogen evolution activity in pH-universal media. Electron-rich MoNi4 generated by Cu NWs supplying electrons enhances water dissociation, while MoO3 doping accelerates H* transfer via hydrogen-bond and hydrogen spillover.

Abstract

Both the adsorption/dissociation of water molecules and hydrogen intermediate (H*) are the major limitations to hydrogen evolution reaction (HER). Herein, the modulation of electronic structure and geometric configuration are combined to design one-dimensional electrocatalyst with outstanding HER activity in a wide pH range. The catalyst was composed of molybdenum trioxide doped molybdenum nickel alloy supported by copper nanowires (MoO3-MoNi4@Cu NWs). As revealed by the experimental characterizations and theoretical calculations, Cu NWs act as the electron donator to MoNi4, resulting in up shift of the d-band center in MoNi4, thus expediting H2O adsorption and dissociation. Moreover, the introduction of amorphous MoO3 sets up a unique geometric configuration on MoNi4 for the accelerated H* transfer via hydrogen-bond and hydrogen spillover. This work provides a synergetic route for constructing HER freeway and promotes further investigations on more versatile electrocatalysis involving H2O or H*.

Keywords

electronic structurehydrogen spilloverpH-universal hydrogen evolution reaction (HER)geometric configurationhydrogen-bond

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Nano Research
Volume 16 Issue 10,
October 2023
Pages 12253-12262
DOI: 10.1007/s12274-023-5826-4
Cite this article:
Chen X, Cao S, Lin X, et al. Construction of pH-universal hydrogen evolution freeway in MoO3-MoNi4@Cu core–shell nanowires via synergetic electronic and geometric effect. Nano Research, 2023, 16(10): 12253-12262. https://doi.org/10.1007/s12274-023-5826-4
Topics:
Hydrogen evolution reaction
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Received: 03 March 2023
Revised: 10 May 2023
Accepted: 10 May 2023
Published: 27 June 2023
© Tsinghua University Press 2023
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