Encapsulating dual-phased Mo2C-WC nanocrystals into ultrathin carbon nanosheet assemblies for efficient electrocatalytic hydrogen evolution

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

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Author(s)

  • Xueting Zhang
  • Zhenye Zhu
  • Fei-Xiang Ma
  • Jiaheng Zhang
  • Yuanbo Tan
  • Zuchen Pan
  • Yiyang Bo

Detail(s)

Original languageEnglish
Article number127270
Journal / PublicationChemical Engineering Journal
Online published7 Oct 2020
Publication statusOnline published - 7 Oct 2020

Abstract

Mo2C and WC are widely considered as promising electrocatalysts for hydrogen evolution reaction (HER) owing to their Pt-like electronic features. Herein, dual-phased Mo2C-WC nanocrystals, densely and uniformly confined in ultrathin carbon nanosheet assemblies (abbreviated as Mo2C-WC/NCAs), which are possible candidates for high-performance HER electrocatalysts, are fabricated through the in-situ pyrolysis of polymers containing Mo and W. When evaluated as HER electrocatalysts, Mo2C-WC/NCAs requires a small overpotential of ~126 mV to drive a current density of 10 mA cm−2, and low Tafel slopes of 72 mV dec-1 and 59 mV dec-1 in acidic and alkaline media, respectively. In addition, the Mo2C-WC/NCAs exhibit robust catalytic stability up to 36 h. The introduction of dual-phased carbide heterostructures can modify the electronic structure and simultaneously facilitate the charge transfer of the catalysts, consistent with the density functional theory (DFT) calculations. This work highlights the in-situ construction of multi-phased hetero-metal carbide heterostructures for high-performance electrocatalysis.

Research Area(s)

  • Dual-phased heterostructures, Hierarchical structures, Hydrogen evolution reaction, Mo2C-WC, Ultrathin nanosheets

Citation Format(s)

Encapsulating dual-phased Mo2C-WC nanocrystals into ultrathin carbon nanosheet assemblies for efficient electrocatalytic hydrogen evolution. / Zhang, Xueting; Zhu, Zhenye; Liang, Xiongyi; Ma, Fei-Xiang; Zhang, Jiaheng; Tan, Yuanbo; Pan, Zuchen; Bo, Yiyang; Lawrence Wu, Chi-Man.

In: Chemical Engineering Journal, 07.10.2020.

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