Journal
CHEMCATCHEM
Volume 12, Issue 2, Pages 536-543Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201901293
Keywords
single atom catalysts; Hydrogen Evolution Reaction; DFT computation; two-dimensional material; electrocatalysis
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Funding
- National Natural Science Foundation of China [21171039, 21373048]
- Natural Science Foundation of Fujian Province [2016J01687]
- Independent Research Project of States Key Laboratory of Photocatalysis on Energy and Environment [SKFLPEE-KF201721]
- Natural Science Foundation of Fujian Province for Distinguished Young Investigator Grant [2013J06004]
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We perform first-principles calculations to investigate whether or not nitrogen is the best dopant in system of Co-X-4 embedded graphene (X=N, S, B, and P) electrocatalysts towards hydrogen evolution reaction(HER). Our theoretical results reveal that N, S, B, and P-doped graphene can enhance the catalytic activity toward HER compared with the pristine graphene, and S doped graphene exhibits more favorable performance than N doped graphene, consistent with the experimental results. For the Co-X-4 embedded graphene (X=N, S, B, and P), we predict that S may be a promising dopant in graphene supported single atom Co. The rather low hydrogen adsorption free energy (-0.07 eV) and activation energy barrier (0.78 eV) for the rate-determining step, the downshift of the d band center, the enhanced charge density of d(z)(2) orbital as well as the reduced work function are responsible for the unexpected activity of Co-S-4 embedded graphene for HER. Overall, Co-S-4 embedded graphene catalyst could be a good candidate for hydrogen evolution reaction.
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