Tuning d-band center of tungsten carbide via Mo doping for efficient hydrogen evolution and Zn–H2O cell over a wide pH range

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

2 Scopus Citations
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Author(s)

  • Lin Wang
  • Zhongjian Li
  • Kexin Wang
  • Qizhou Dai
  • Chaojun Lei
  • Bin Yang
  • Qinghua Zhang
  • Lecheng Lei
  • Yang Hou

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number104850
Number of pages9
Journal / PublicationNano Energy
Volume74
Online published25 Apr 2020
Publication statusPublished - Aug 2020

Abstract

Designing highly active transition metal carbides based electrocatalysts to substitute for the state-of-the-art noble-metal materials for hydrogen evolution reaction (HER) over a wide pH range is still a crucial challenge. Herein, we reported a novel 2D hybrid electrocatalyst containing Mo-doped WC core with particle size of ~5 nm embedded into N-doped carbon shells (Mo-WC@NCS) through a carbonization treatment of Mo-doped W/Zn bimetallic-imidazolate frameworks. Benefiting from large surface area and optimized electronic structure, the achieved Mo-WC@NCS hybrid displayed a low overpotential of 179 mV at 10 mA cm−2 with a small Tafel slope of 81 mV dec−1 for HER in base, showing almost the best performance among all previously reported WC-based hybrid HER electrocatalysts. This Mo-WC@NCS hybrid also delivered robust HER catalytic activities in both acidic and neutral media. Experimental observations and theoretical calculations demonstrated that the d-band center of W in Mo-WC@NCS hybrid was obviously downshifted after Mo dopants, which was beneficial to modulate the electronic structure of the W centers and thereby facilitated the H desorption, thus boosting hydrogen generation. Acting as a cathode in alkaline-acid Zn–H2O fuel cell, the Mo-WC@NCS hybrid delivered a power density of up to 41.4 mW cm−2 and maintained a long-term stability for H2 generation.

Research Area(s)

  • Tuning d-band center, Tungsten carbide, Mo dopants, Hydrogen evolution, Wide pH range

Citation Format(s)

Tuning d-band center of tungsten carbide via Mo doping for efficient hydrogen evolution and Zn–H2O cell over a wide pH range. / Wang, Lin; Li, Zhongjian; Wang, Kexin; Dai, Qizhou; Lei, Chaojun; Yang, Bin; Zhang, Qinghua; Lei, Lecheng; Leung, Michael K.H.; Hou, Yang.

In: Nano Energy, Vol. 74, 104850, 08.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal