Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 18, Pages 8233-8237Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta01928b
Keywords
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Funding
- National Natural Science Foundation of China [21435005, 21627808, 21603215]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDY-SSW-SLH019]
- Development Project of Science and Technology of Jilin Province [20180520146JH]
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Here, we describe the synthesis of a novel interwoven NiS/NiS2 structure with an amorphous interface accomplished by carrying out a one-step thermal decomposition of nickel sulfate and thiourea. A partial phase transition from NiS2 to NiS induced the amorphous interface in NiS/NiS2 and was expected to separate the H* and H- intermediates onto different interface sites, and to reduce the interfacial energy and charge-transfer resistance as well. When NiS/NiS2 was applied as an electrocatalyst for overall water splitting (OWS), it achieved a geometrical current density of 100 mA cm(-2) at a low overpotential of 248 mV for the hydrogen evolution reaction (HER) and 416 mV for the oxygen evolution reaction (OER), obviously superior to those of the single-phase catalysts. In addition, it was also employed as an efficient bifunctional catalyst for OWS, yielding a current density of 10 mA cm(-2) at a voltage of 1.62 V.
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