Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 8, Issue 5, Pages 1594-1601Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ee00751h
Keywords
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Funding
- National Natural Science Foundation of China [21321002, 21303191]
- strategic Priority Research Program of the Chinese Academy of Sciences [XDA09030100]
- China Postdoctoral Science Foundation [2014M551131]
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Electrocatalytic splitting of water is one of the most efficient technologies for hydrogen production, and two-dimensional (2D) MoS2 has been considered as a potential alternative to Pt-based catalysts in the hydrogen evolution reaction (HER). However, the catalytic activity of 2D MoS2 is always contributed from its edge sites, leaving a large number of in-plane domains useless. Herein, we for the first time demonstrated that the catalytic activity of in-plane S atoms of MoS2 can be triggered via single-atom metal doping in HER. In experiments, single Pt atom-doped, few-layer MoS2 nanosheets (Pt-MoS2) showed a significantly enhanced HER activity compared with pure MoS2, originating from the tuned adsorption behavior of H atoms on the in-plane S sites neighboring the doped Pt atoms, according to the density functional theory (DFT) calculations. Furthermore, the HER activity of MoS2 doped with a number of transition metals was screened by virtue of DFT calculations, resulting in a volcano curve along the adsorption free energy of H atoms (Delta G(H)degrees), which was further confirmed in experiment by using non-precious metals such as Co and Ni atoms doping 2D MoS2 as the catalysts.
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