期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 242, 期 -, 页码 60-66出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.09.064
关键词
Heterogeneous interface; Ni(OH)(2)/Ni3S2 nanoforest; Electrocatalyst; Water splitting
资金
- National Natural Science Foundation of China [91534202, 91534122]
- Social Development Program of Shanghai [17DZ1200900]
- Shanghai Scientific and Technological Innovation Project [18JC1410600]
- National Program for Support of Top-Notch Young Professionals
- Fundamental Research Funds for the Central Universities [222201718002]
The sluggish water dissociation kinetics of low-cost Ni3S2 electrocatalysts severely hinders the hydrogen evolution reaction (HER), resulting in unsatisfied overall water splitting in alkaline media. Herein, we demonstrate the self-assembly of a new nanoforest electrocatalyst by ultrathin Ni(OH)(2)/Ni3S2 heterogeneous nanosheets (similar to 1.8 nm) using a high-temperature and large-potential electrodeposition technique. The surface atomic configuration of Ni3S2 is well-modulated by hetero-interface engineering with the Ni(OH)(2) cocatalyst, effectively accelerating the Volmer step and OH- adsorption during the HER without sacrificing the oxygen evolution reaction (OER). The resultant electrocatalysts exhibit superior and stable electrocatalytic activity toward the HER and OER in 1 M KOH with small overpotentials of 50 mV and 210 mV at 10 mA cm(-2), respectively. Using the Ni(OH)(2)/Ni3S2 nanoforest as dual-functional electrocatalysts, an alkaline electrolyzer can render 100 mA cm(-2) at a very low cell voltage of 1.64 V while keep stable for 120 hat 1.55 V, which outperforms the best report for Ni-based electrocatalysts. This finding gives a new insight into the modulating surface atomic configuration for achieving highly active electrocatalysts for water splitting.
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