Journal
ADVANCED MATERIALS
Volume 29, Issue 30, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201701584
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Funding
- National Basic Research Program of China [2015CB932302]
- Natural Science Foundation of China [U1432133, U1532265, 11621063, 21331005, J1030412]
- CAS [QYZDY4SSW4SLH011]
- Chinese Academy of Science [XDB01020300]
- Fundamental Research Funds for the Central Universities [WK2060190080, WK2060190027]
- National Program for Support of Top-Notch Young Professionals
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Developing non-noble-metal electrocatalysts with high activity and low cost for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is of paramount importance for improving the generation of H-2 fuel by electrocatalytic water-splitting. This study puts forward a new N-anion-decorated Ni3S2 material synthesized by a simple one-step calcination route, acting as a superior bifunctional electrocatalyst for the OER/HER for the first time. The introduction of N anions significantly modifies the morphology and electronic structure of Ni3S2, bringing high surface active sites exposure, enhanced electrical conductivity, optimal HER Gibbs free-energy (Delta G(H*)), and water adsorption energy change (Delta G(H2O*)). Remarkably, the obtained N-Ni3S2/NF 3D electrode exhibits extremely low overpotentials of 330 and 110 mV to reach a current density of 100 and 10 mA cm(-2) for the OER and HER in 1.0 m KOH, respectively. Moreover, an overall water-splitting device comprising this electrode delivers a current density of 10 mA cm(-2) at a very low cell voltage of 1.48 V. Our finding introduces a new way to design advanced bifunctional catalysts for water splitting.
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