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Issue 8, 2019
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Electrochemically activated cobalt nickel sulfide for an efficient oxygen evolution reaction: partial amorphization and phase control

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Abstract

It has recently been demonstrated that the OER activity of transition metal sulfides (TMSs) could be enhanced by the introduction of a thin amorphous layer on a pristine surface. We report here a novel strategy to enhance the OER by developing cobalt nickel sulfide (CoxNi1−xS2, CNS) with a high density of crystalline and amorphous phase boundaries. Electrochemical activation (ECA) can partially amorphize hollow CNS nanoparticles derived from surface-selective sulfidation. The ECA-treated CNS (ECA-CNS) electrocatalyst, which is comprised of CNS nanodots separated by thin amorphous layers, shows high densities of crystalline and amorphous phase boundaries. This catalyst shows superior OER catalytic performance with a current density of 10 mA cm−2 at a small overpotential of 290 mV, a low Tafel slope of 46 mV dec−1, a high mass activity of 217 A g−1, a high turnover frequency of 0.21 s−1 at an overpotential of 340 mV, and excellent stability in alkaline media.

Graphical abstract: Electrochemically activated cobalt nickel sulfide for an efficient oxygen evolution reaction: partial amorphization and phase control

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Publication details

The article was received on 22 Oct 2018, accepted on 18 Nov 2018 and first published on 20 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA10142F
Citation: J. Mater. Chem. A, 2019,7, 3592-3602

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    Electrochemically activated cobalt nickel sulfide for an efficient oxygen evolution reaction: partial amorphization and phase control

    Y. Hong, S. Mhin, K. Kim, W. Han, H. Choi, G. Ali, K. Y. Chung, H. J. Lee, Seong-I. Moon, S. Dutta, S. Sun, Y. Jung, T. Song and H. Han, J. Mater. Chem. A, 2019, 7, 3592
    DOI: 10.1039/C8TA10142F

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