Plasma-Induced Exfoliation Provides Onion-Like Graphene-Surrounded MoS2 Nanosheets for a Highly Efficient Hydrogen Evolution Reaction

Van Truong Nguyen, Phuoc Anh Le, Yung Chi Hsu, Kung Hwa Wei*

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

With the goal of obtaining sustainable earth-abundant electrocatalyst materials displaying high performance in the hydrogen evolution reaction (HER), here we propose a facile one-pot plasma-induced electrochemical process for the fabrication of new core-shell structures of ultrathin MoS2 nanosheets engulfed within onion-like graphene nanosheets (OGNs@MoS2). The resultant OGNs@MoS2 structures not only increased the number of active sites of the semiconducting MoS2 nanosheets but also enhanced their conductivity. Our OGNs@MoS2 composites exhibited high HER performance, characterized by a low overpotential of 118 mV at a current density of 10 mA cm-2, a Tafel slope of 73 mV dec-1, and long-time stability of 105 s without degradation; this performance is much better than that of the sheet-like graphene-wrapped MoS2 composite GNs@MoS2 (182 mV, 82 mV dec-1) and is among the best ever reported for composites involving MoS2 and graphene nanosheets prepared through a simple one-batch process and using a low temperature and a short time for the HER. This approach appears to be an effective and simple strategy for tuning the morphologies of composites of graphene and transition metal dichalcogenide materials for a broad range of energy applications.

Original languageEnglish
Pages (from-to)11533-11542
Number of pages10
JournalACS Applied Materials and Interfaces
Volume12
Issue number10
DOIs
StatePublished - 11 Mar 2020

Keywords

  • electrocatalyst
  • graphene/MoS composite
  • hydrogen evolution reaction
  • one-pot plasma-induced exfoliation
  • onion-like graphene

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