Journal
ADVANCED MATERIALS
Volume 30, Issue 26, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201707301
Keywords
electrocatalysis; hydrogen evolution; materials chemistry; structure engineering; tensile strain
Categories
Funding
- National Natural Science Foundation of China (NSFC) [51373154, 51573166, 51472182, U1503292, 71371143, 51671003]
- MOE SAFEA
- 111 Project [B13025]
- National Basic Research Program of China [2017YFA0206701]
- Open Project Foundation of State Key Laboratory of Chemical Resource Engineering
- Peking University and Young Thousand Talented Program
- national first-class discipline program of Light Industry Technology and Engineering [LITE2018-19]
- Fundamental Research Funds for the Central Universities
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Tuning surface strain is a new strategy for boosting catalytic activity to achieve sustainable energy supplies; however, correlating the surface strain with catalytic performance is scarce because such mechanistic studies strongly require the capability of tailoring surface strain on catalysts as precisely as possible. Herein, a conceptual strategy of precisely tuning tensile surface strain on Co9S8/MoS2 core/shell nanocrystals for boosting the hydrogen evolution reaction (HER) activity by controlling the MoS2 shell numbers is demonstrated. It is found that the tensile surface strain of Co9S8/MoS2 core/shell nanocrystals can be precisely tuned from 3.5% to 0% by changing the MoS2 shell layer from 5L to 1L, in which the strained Co9S8/1L MoS2 (3.5%) exhibits the best HER performance with an overpotential of only 97 mV (10 mA cm(-2)) and a Tafel slope of 71 mV dec(-1). The density functional theory calculation reveals that the Co9S8/1L MoS2 core/shell nanostructure yields the lowest hydrogen adsorption energy (Delta E-H) of -1.03 eV and transition state energy barrier (Delta E-2H*) of 0.29 eV (MoS2, Delta E-H = -0.86 eV and (Delta E-2H* = 0.49 eV), which are the key in boosting HER activity by stabilizing the HER intermediate, seizing H ions, and releasing H-2 gas.
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