Journal
SMALL
Volume 16, Issue 28, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202002212
Keywords
alkaline environment; hydrogen evolution reaction; interface modulation; MoS2; metal oxides heterostructures; reaction kinetics
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Funding
- National Nature Science Foundation of China [21862011, 51864024, 21771156]
- National Nature Science Foundation of Yunnan province [2019FI003]
- Kunming University of Science and Technology [KKKP201707010, KKKP201752011]
- Shenzhen Knowledge Innovation Program (Basic Research) [JCYJ20190808181205752]
- Research Grant Council (RGC) in Hong Kong [PolyU 253026/16P]
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Developing efficient earth-abundant MoS2 based hydrogen evolution reaction (HER) electrocatalysts is important but challenging due to the sluggish kinetics in alkaline media. Herein, a strategy to fabricate a high-performance MoS2 based HER electrocatalyst by modulating interface electronic structure via metal oxides is developed. All the heterostructure catalysts present significant improvement of HER electrocatalytic activities, demonstrating a positive role of metal oxides decoration in promoting the rate-limited water dissociation step for the HER mechanism in alkaline media. The as-obtained MoS2/Ni2O3H catalyst exhibits a low overpotential of 84 mV at 10 mA cm(-2) and small charge-transfer resistance of 1.5 omega in 1 m KOH solution. The current density (217 mA cm(-2)) at the overpotential of 200 mV is about 2 and 24 times higher than that of commercial Pt/C and bare MoS2, respectively. Additionally, these MoS2/metal oxides heterostructure catalysts show outstanding long-term stability under a harsh chronopotentiometry test. Theoretical calculations reveal the varied sensitivity of 3d-band in different transition oxides, in which Ni-3d of Ni2O3H is evidently activated to achieve fast electron transfer for HER as the electron-depletion center. Both electronic properties and energetic reaction trends confirm the high electroactivity of MoS2/Ni2O3H in the adsorption and dissociation of H2O for highly efficient HER in alkaline media.
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