Electrochemically activated cobalt nickel sulfide for an efficient oxygen evolution reaction: partial amorphization and phase control
- Electrochemically activated cobalt nickel sulfide for an efficient oxygen evolution reaction: partial amorphization and phase control
- 정경윤; 굴람 알리; 홍유림; 민성욱; 김강민; 한원식; 최희채; 이호준; Seong-I. Moon; Soumen Dutta; 선세호; 정연길; 송태섭; 한혁수
- Issue Date
- Journal of materials chemistry. A, Materials for energy and sustainability
- VOL 7, NO 8-3602
- 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.
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