NDLI: <i>In situ</i> electrochemical formation of core–shell nickel–iron disulfide and oxyhydroxide heterostructured catalysts for a stable oxygen evolution reaction and the associated mechanisms

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Xiuyun Golberg, Dmitri Zhou, Min Xue, Yanming Zeng, Xianghua Weng, Qunhong Bando, Yoshio Wang, Xi
Copyright Year	2017
Abstract	For electrochemical production of H2 fuels from water splitting, the development of efficient and economic catalysts for the oxygen evolution reaction (OER) is still a challenging issue. This is because an OER process usually involves multiple electron-transfer and reaction steps; these result in large overpotentials and significant energy loss. Thus, a smart design of highly efficient, stable and cheap OER electrocatalysts is important for the improvement of energy conversion efficiency and reduction of water splitting procedure cost. In this work, we find that a thin crystalline oxyhydroxide layer has been in situ electrochemically formed on the surfaces of conductive nickel–iron disulfide nanostructures; such a heterostructure takes advantage of highly catalytically active oxyhydroxide surfaces and excellent conductivity of the interior disulfide phase. This results in a very low overpotential of 230 mV at a current density of 10 mA cm−2, which is among the best OER catalysts in alkaline electrolyte ever reported. The crystalline oxyhydroxide layer can effectively prevent the disulfide core from further oxidation, maintains the core–shell structure of the catalyst and is considered to be critical for stable and efficient OER performances.
Starting Page	4335
Ending Page	4342
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	5
Issue Number	9
Journal	Journal of Materials Chemistry A
DOI	10.1039/c6ta09366c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Electrochemistry Water splitting Oxygen evolution Molybdenum disulfide Heterojunction Overpotential Current density Electrolyte
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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