Citation: Shixin Hua, Dan Qu, Li An, Guangcheng Xi, Ge Chen, Fan Li, Zhijun Zhou, Zaicheng Sun. Highly dispersed few-layer MoS₂nanosheets on S, N co-doped carbon for electrocatalytic H₂ production[J]. Chinese Journal of Catalysis, ;2017, 38(6): 1028-1037. doi: 10.1016/S1872-2067(17)62830-4 shu

Highly dispersed few-layer MoS₂nanosheets on S, N co-doped carbon for electrocatalytic H₂ production

Shixin Hua ^a, ,
Dan Qu ^a,b,c ,
Li An ^a ,
Guangcheng Xi ^d ,
Ge Chen ^a ,
Fan Li ^a ,
Zhijun Zhou ^e ,
Zaicheng Sun ^a

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 Date: 14 February 2017
Revised Date: 18 March 2017

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

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 S^2- 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.
- MoS₂ nanosheet,
- S, N co-doped carbon,
- Electrocatalytic hydrogen production,
- Composite,
- Hydrogen evolution reaction
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Highly dispersed few-layer MoS₂nanosheets on S, N co-doped carbon for electrocatalytic H₂ production