Issue 18, 2018

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

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

Supplementary files

Article information

Article type
Communication
Submitted
28 Feb 2018
Accepted
16 Apr 2018
First published
17 Apr 2018

J. Mater. Chem. A, 2018,6, 8233-8237

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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