Journal
NANO ENERGY
Volume 53, Issue -, Pages 458-467Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.09.003
Keywords
Ni Single atom; MoS2; Hydrogen evolution reaction; Active sites
Categories
Funding
- 1000 Talents Plan of China
- Shenzhen government
- National Natural Science Foundation of China [51602143, 11474047]
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MoS2 has been considered as a potential alternative to Pt-based catalysts in the hydrogen evolution reaction (HER). However, the presence of the inactive in-plane domains limits their intrinsic electrocatalytic activity of the catalyst. Here, we demonstrate a new approach for activating these inactive sites and therefore dramatically enhancing the activity. We discover that decorating single Ni atom on MoS2 can increase the HER activity in both alkaline and acidic conditions. Experimental and theoretical results indicate that single Ni atom modifiers are inclined to single dispersion in the S-edge sites and H-basal sites of MoS2, resulting in a favorable change in the adsorption behavior of H atoms on their neighboring S atoms and subsequently the HER activity. Consequently, the single-Ni-atom decorated MoS2 (Ni-SA-MoS2) achieved cathodic current density of 10 mA cm(-2) at over-potentials of 98 mV and 110 mV in 1M KOH and 0.5M H2SO4, respectively. The dispersion of the Ni single atoms in the Ni-SA-MoS2 is unaffected upon 2000 cycles in both acidic and alkaline conditions. This single atom decorating approach presents a facile and promising pathway for designing active electrocatalysts for energy conversion and storage.
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