期刊
ACS CATALYSIS
卷 7, 期 9, 页码 6179-6187出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.7b02225
关键词
bimetal sulfide; NiS2/MoS2 HNW; hydrogen evolution reaction; wide pH range; lattice interfaces
资金
- NSFC [51320105001, 51372190, 21433007, 21573170]
- National Basic Research Program of China [2013CB632402]
- Natural Science Foundation of Hubei Province of China [2015CFA001]
- Fundamental Research Funds for the Central Universities [WUT: 2015-III-034, 2017 IVA 092]
- Innovative Research Funds of SKLWUT [2017-ZD-4]
Electrochemical water splitting to produce hydrogen bears a great commitment for future renewable energy conversion and storage. By employing an in situ chemical vapor deposition (CVD) process, we prepared a bimetal (Ni and Mo) sulfide-based hybrid nanowire (NiS2/MoS2 HNW), which was composed of NiS2 nanoparticles and MoS2 nanoplates, and revealed that it is an efficient electrocatalyst for the hydrogen evolution reaction (HER) over a wide pH range due to the collective effects of rational morphological design and synergistic heterointerfaces. On a simple glassy carbon (GC) electrode, NiS2/MoS2 HNW displays over potentials at -10 mA cm(-2) catalytic current density (eta(10)) of 204, 235, and 284 mV with small Tafel slopes of 65, 58, and 83 mV dec(-1) in alkaline, acidic, and neutral electrolyte, respectively, exhibiting pH-universal-efficient electrocatalytic HER performance, which is comparable to the recently reported state-of-the-art sulfide-based HER electrocatalysts. Theoretical calculations further confirm that the advantage of all-pH HER activity of NiS2/MoS2 originates from the enhanced dissociation of H2O induced by the formation of lattice interfaces of NiS2-MoS2 heterojunctions. This work can pave a valuable route for designing and fabricating inexpensive and high-performance electrocatalysts toward HER over a wide pH range.
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