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Tuning the Intrinsic Activity and Electrochemical Surface Area of MoS2 via Tiny Zn Doping: Toward an Efficient Hydrogen Evolution Reaction (HER) Catalyst |
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| Authors: | Jun Xu Zelin Zhao Wei Wei Dr Ganggang Chang Prof Zhizhong Xie Dr Wei Guo Dr Dan Liu Prof Deyu Qu Prof Haolin Tang Prof Junsheng Li |
| Institution: | 1. School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070 China
Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu hydrogen Valley, Foshan, 528200 China Research Center for Materials Genome Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070 China These authors contributed equally to this work.;2. School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070 China These authors contributed equally to this work.;3. International School of Materials Science and Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070 China;4. School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070 China;5. Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu hydrogen Valley, Foshan, 528200 China;6. Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu hydrogen Valley, Foshan, 528200 China Hubei provincial key laboratory of fuel cell, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070 China |
| Abstract: | Molybdenum sulfide (MoS2) is considered as an alternative material for commercial platinum catalysts for electrocatalytic hydrogen evolution reaction (HER). Improving the apparent HER activity of MoS2 to a level comparable to that of Pt is an essential premise for the commercial use of MoS2. In this work, a Zn-doping strategy is proposed to enhance the HER performance of MoS2. It is shown that tiny Zn doping into MoS2 leads to the enhancement of the electrochemical surface area, increases in proportion of HER active 1T phase in the material and formation of catalytic sites of higher intrinsic activity. These benefits result in a high-performance HER electrocatalyst with a low overpotential of 190 mV(@10 mA cm−2) and a low Tafel slope of 58 mV dec−1. The origin for the excellent electrochemical performance of the doped MoS2 is rationalized with both experimental and theoretical investigations. |
| Keywords: | defects hydrogen evolution intrinsic activity MoS2 Zn-doping |