Journal
SMALL
Volume 16, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201905083
Keywords
density functional theory (DFT); electronic modulation; interfacial electron transfer; NiS2; NiSe2 heterocages; oxygen evolution reaction
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Funding
- National Natural Science Foundation of China [U1662104, 21576288]
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Tetrahedral NiS2/NiSe2 heterocages with rich-phase boundaries are synthesized through a simultaneous sulfuration/selenylation process using Ni-based acetate hydroxide prisms as precursor. Such a nanocage-like NiS2/NiSe2 heterostructure can expose more active sites, accelerate the mass transport of the ions/gas, and optimize the interfacial electronic structure, which shows a significantly lower overpotential of 290 mV at 20 mA cm(-2) than those of NiS/NiS2 and NiSe2 as counterparts. The experimental characterizations and theoretical density functional theory (DFT) calculations unveil that the interfacial electron transfer from NiSe2 to NiS2 at the heterointerface can modulate the electronic structure of NiS2/NiSe2, which further cooperates synergistically to change the Gibbs free energy of oxygen-containing intermediates as the rate-determining step (RDS) from 2.16 eV (NiSe2) and 2.10 eV (NiS2) to 1.86 eV (NiS2/NiSe2 heterostructures) during the oxygen evolution reaction (OER) process. And as a result, tetrahedral NiS2/NiSe2 heterocages with dual-phase synergy efficiently trigger the OER process, and accelerate the OER kinetics. This work provides insights into the roles of the interfacial electron transfer in electrocatalysis, and can be an admirable strategy to modulate the electronic structure for developing highly active electrocatalysts.
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