Coral-shaped MoS2 decorated with graphene quantum dots performing as a highly active electrocatalyst for hydrogen evolution reaction

Bangjun Guo, Ke Yu, Honglin Li, Ruijuan Qi, Yuanyuan Zhang, Haili Song, Zheng Tang, Ziqiang Zhu, Mingwei Chen

    Research output: Contribution to journalArticlepeer-review

    46 Citations (Scopus)

    Abstract

    We report a new CVD method to prepare coral-shaped monolayer MoS2 with a large amount of exposed edge sites for catalyzing hydrogen evolution reaction. The electrocatalytic activities of the coral-shaped MoS2 can be further enhanced by electronic band engineering via decorated with graphene quantum dot (GQD) decoration. Generally, GQDs improve the electrical conductivity of the MoS2 electrocatalyst. First-principles calculations suggest that the coral MoS2@GQD is a zero-gap material. The high electric conductivity and pronounced catalytically active sites give the hybrid catalyst outstanding electrocatalytic performance with a small onset overpotential of 95 mV and a low Tafel slope of 40 mV/dec as well as excellent long-term electrocatalytic stability. The present work provides a potential way to design two-dimensional hydrogen evolution reaction (HER) electrocatalysts through controlling the shape and modulating the electric conductivity.

    Original languageEnglish
    Pages (from-to)3653-3660
    Number of pages8
    JournalACS Applied Materials and Interfaces
    Volume9
    Issue number4
    DOIs
    Publication statusPublished - 2017 Feb 1

    Keywords

    • Coral shape
    • Electrocatalysis
    • Graphene quantum dots
    • Hydrogen evolution reaction
    • Monolayer molybdenum disulfide

    ASJC Scopus subject areas

    • Materials Science(all)

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