Jump to main content
Jump to site search

Issue 9, 2017
Previous Article Next Article

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

Author affiliations

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.

Graphical abstract: In situ electrochemical formation of core–shell nickel–iron disulfide and oxyhydroxide heterostructured catalysts for a stable oxygen evolution reaction and the associated mechanisms

Back to tab navigation

Supplementary files

Publication details

The article was received on 29 Oct 2016, accepted on 18 Jan 2017 and first published on 18 Jan 2017


Article type: Paper
DOI: 10.1039/C6TA09366C
Citation: J. Mater. Chem. A, 2017,5, 4335-4342
  •   Request permissions

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

    M. Zhou, Q. Weng, X. Zhang, X. Wang, Y. Xue, X. Zeng, Y. Bando and D. Golberg, J. Mater. Chem. A, 2017, 5, 4335
    DOI: 10.1039/C6TA09366C

Search articles by author

Spotlight

Advertisements