In Situ Thermal Synthesis of Inlaid Ultrathin MoS2/Graphene Nanosheets as Electrocatalysts for the Hydrogen Evolution Reaction
详细信息 查看全文
- 作者：Lianbo Ma ; Yi Hu ; Guoyin Zhu ; Renpeng Chen ; Tao Chen ; Hongling Lu ; Yanrong Wang ; Jia Liang ; Haixia Liu ; Changzeng Yan ; Zuoxiu Tie ; Zhong Jin ; Jie Liu
- 刊名：Chemistry of Materials
- 出版年：2016
- 出版时间：August 23, 2016
- 年：2016
- 卷：28
- 期：16
- 页码：5733-5742
- 全文大小：605K
- 年卷期：0
- ISSN：1520-5002
文摘
Herein, we report a unique thermal synthesis method to prepare a novel two-dimensional (2D) hybrid nanostructure consisting of ultrathin and tiny-sized molybdenum disulfide nanoplatelets homogeneously inlaid in graphene sheets (MoS<sub>2sub>/G) with excellent electrocatalytic performance for HER. In this process, molybdenum oleate served as the source of both molybdenum and carbon, while crystalline sodium sulfate (Na<sub>2sub>SO<sub>4sub>) served as both reaction template and sulfur source. The remarkable integration of MoS<sub>2sub> and graphene in a well-assembled 2D hybrid architecture provided large electrochemically active surface area and a huge number of active sites and also exhibited extraordinary collective properties for electron transport and H<sup>+sup> trapping. The MoS<sub>2sub>/G inlaid nanosheets deliver ultrahigh catalytic activity toward HER among the existing electrocatalysts with similar compositions, presenting a low onset overpotential approaching 30 mV, a current density of 10 mA/cm<sup>2sup> at ∼110 mV, and a Tafel slope as small as 67.4 mV/dec. Moreover, the strong bonding between MoS<sub>2sub> nanoplatelets and graphene enabled outstanding long-term electrochemical stability and structural integrity, exhibiting almost 100% activity retention after 1000 cycles and ∼97% after 100 000 s of continuous testing (under static overpotential of −0.15 V). The synthetic strategy is simple, inexpensive, and scalable for large-scale production and also can be extended to diverse inlaid 2D nanoarchitectures with great potential for many other applications.