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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
Author
송태섭
Keywords
N-DOPED GRAPHENE; HYDROGEN EVOLUTION; BIFUNCTIONAL ELECTROCATALYST; WATER OXIDATION; NANOPARTICLES; NITROGEN; REDUCTION; PHOSPHIDE; OXIDE; NANOCRYSTALS
Issue Date
2019-02
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v. 7, NO 8, Page. 3592-3602
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
https://pubs.rsc.org/en/content/articlelanding/2019/TA/C8TA10142F#!divAbstracthttps://repository.hanyang.ac.kr/handle/20.500.11754/108197
ISSN
2050-7488; 2050-7496
DOI
10.1039/c8ta10142f
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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