Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (6): 1028-1037.DOI: 10.1016/S1872-2067(17)62830-4

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Highly dispersed few-layer MoS2 nanosheets on S, N co-doped carbon for electrocatalytic H2 production

Shixin Huaa, Dan Qua,b,c, Li Ana, Guangcheng Xid, Ge Chena, Fan Lia, Zhijun Zhoue, Zaicheng Suna   

  1. a. Beijing Key Laboratory of Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology, Chaoyang Distrcti, Beijing 100124, China;
    b. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics, and Physics, Chinese Academy of Sciences, Changchun 130033, Jilin, China;
    c. University of Chinese Academy of Sciences, Beijing 100049, China;
    d. Nanomaterials and Nanoproducts Research Center, Chinese Academy of Inspection and Quarantine, Beijing 100000, China;
    e. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621000, Sichuan, China
  • Received:2017-02-14 Revised:2017-03-18 Online:2017-06-18 Published:2017-06-08
  • Supported by:

    This work is supported by the National Natural Science Foundation of China (21671011) and Beijing High-Level Talent program

Abstract:

Ultrathin small MoS2 nanosheets exhibit a higher electrocatalytic activity for the hydrogen evolution reaction. However, strong interactions between MoS2 layers may result in aggregation; together with the low conductivity of MoS2, this may lower its electrocatalytic activity. In this paper we present a method that we developed to directly produce solid S, N co-doped carbon (SNC) with a graphite structure and multiple surface groups through a hydrothermal route. When Na2MoO4 was added to the reaction, polymolybdate could be anchored into the carbon materials via a chemical interaction that helps polymolybdate disperse uniformly into the SNC. After a high temperature treatment, polymolybdate transformed into MoS2 at 800 ℃ for 6 h in a N2 atmosphere at a heating rate of 5 ℃/min, owing to S2- being released from the SNC during the treatment (denoted as MoS2/SNC-800-6h). The SNC effectively prevents MoS2 from aggregating into large particles, and we successfully prepared highly dispersed MoS2 in the SNC matrix. Electrochemical characterizations indicate that MoS2/SNC-900-12h exhibits a low onset potential of 115 mV and a low overpotential of 237 mV at a current density of 10 mA/cm2. Furthermore, MoS2/SNC-900-12h also had an excellent stability with only ~2.6% decay at a current density of 10 mA/cm2 after 5000 test cycles.

Key words: MoS2 nanosheet, S, N co-doped carbon, Electrocatalytic hydrogen production, Composite, Hydrogen evolution reaction