Coral-Shaped MoS2 Decorated with Graphene Quantum Dots Performing as a Highly Active Electrocatalyst for Hydrogen Evolution Reaction

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• 作者：Bangjun GuoKe Yu ; Honglin LiRuijuan Qi ; Yuanyuan Zhang ; Haili Song ; Zheng Tang ; Ziqiang Zhu ; Mingwei Chen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：February 1, 2017
• 年：2017
• 卷：9
• 期：4
• 页码：3653-3660
• 全文大小：673K
• ISSN：1944-8252

文摘

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.