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Issue 18, 2018
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Construction of amorphous interface in an interwoven NiS/NiS2 structure for enhanced overall water splitting

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Abstract

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.

Graphical abstract: Construction of amorphous interface in an interwoven NiS/NiS2 structure for enhanced overall water splitting

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Publication details

The article was received on 28 Feb 2018, accepted on 16 Apr 2018 and first published on 17 Apr 2018


Article type: Communication
DOI: 10.1039/C8TA01928B
Citation: J. Mater. Chem. A, 2018,6, 8233-8237
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    Construction of amorphous interface in an interwoven NiS/NiS2 structure for enhanced overall water splitting

    Q. Li, D. Wang, C. Han, X. Ma, Q. Lu, Z. Xing and X. Yang, J. Mater. Chem. A, 2018, 6, 8233
    DOI: 10.1039/C8TA01928B

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