期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 1, 页码 644-653出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b01659
关键词
Co-doped VSe2; electrocatalyst; hydrogen evolution reaction; DFT calculation; one-pot
资金
- Science and Technology Development Fund from Macau SAR [FDCT-132/2014/A3, FDCT-110/2014/SB]
- Research & Development Office at the University of Macau [MYRG2017-00027-FST, MYRG2018-00003-IAPME]
- National Natural Science Foundation of China [21671096, 21603094]
- Natural Science Foundation of Shenzhen [20170412153139454, JCYJ20170817110251498]
- Guangdong Special Support for the Science and Technology Leading Young Scientist [2016TQ03C919]
We report a simple one-step hydrothermal method to fabricate cobalt (Co)-doped vanadium diselenide (VSe2) nanosheets on a carbon cloth for the hydrogen evolution reaction (HER) in acid solution. We find that the Co-doped VSe2 shows significantly enhanced catalytic activity compared with the pristine VSe2, including a low over potential of 230 mV at 10 mA/cm(2), a small Tafel slope of 63.4 mV/dec, and high stability. Our density functional theory calculations show that Co dopants dramatically reduce the Gibbs free energy for hydrogen adsorption (AGH), leading to improved catalytic activity for hydrogen evolution. Moreover, the Co doping promotes electron transfer and HER kinetics. Our results provide a valuable route to improve the catalytic performance of metal diselenide in HER.
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