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

Title
Electrochemically activated cobalt nickel sulfide for an efficient oxygen evolution reaction: partial amorphization and phase control
Authors
정경윤굴람 알리홍유림민성욱김강민한원식최희채이호준Seong-I. MoonSoumen Dutta선세호정연길송태섭한혁수
Issue Date
2019-02
Publisher
Journal of materials chemistry. A, Materials for energy and sustainability
Citation
VOL 7, NO 8-3602
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.
URI
http://pubs.kist.re.kr/handle/201004/69217
ISSN
2050-7488
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