Carbon-Based Composite as an Efficient and Stable Metal-Free Electrocatalyst

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

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Author(s)

  • Xiujun Fan
  • Zhiwei Peng
  • Juanjuan Wang
  • Haiqing Zhou
  • Xia Guo

Detail(s)

Original languageEnglish
Pages (from-to)3621-3629
Journal / PublicationAdvanced Functional Materials
Volume26
Issue number21
Online published8 Apr 2016
Publication statusPublished - 7 Jun 2016
Externally publishedYes

Abstract

Silicon carbide (SiC) encapsulated with graphitized nanodiamond (GD) sheaths (SiC-GD) as a core–shell nanocrystal (NC) is synthesized with atomic H post-treatment of vertically aligned carbon nanotubes, which are unzipped and converted into graphene nanoribbons (GNRs) and preserve their vertically aligned integrity. The SiC-GD core–shell NCs anchor on the GNRs framework and form SiC-GD@GNRs composite. The nucleation and growth mechanisms for single crystal nanodiamond without diamond seed are discussed. The SiC-GD@GNRs composite as a metal-free electrocatalyst exhibits a high activity in the hydrogen evolution reaction, with a small onset overpotential of 8 mV, Tafel slope of 54 mV dec−1, and exchange current density @ 200 mV of 77.4 mV, as well as long term stability in acid medium. The superior electrocatalytic performances of SiC-GD@GNRs are ascribed to a high dispersion of SiC-GD NCs on the GNRs support and a high stability of the GD and GNRs in acid solution.

Research Area(s)

  • atomic H treatment, core–shell, hydrogen evolution reaction (HER), SiC-GD, vertically aligned graphene nanoribbons (VA-GNRs)

Citation Format(s)

Carbon-Based Composite as an Efficient and Stable Metal-Free Electrocatalyst. / Fan, Xiujun; Peng, Zhiwei; Wang, Juanjuan; Ye, Ruquan; Zhou, Haiqing; Guo, Xia.

In: Advanced Functional Materials, Vol. 26, No. 21, 07.06.2016, p. 3621-3629.

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