Universität zu Köln

Hong, Yu-Rim, Mhin, Sungwook, Kim, Kang-Min, Han, Won-Sik, Choi, Heechae ORCID: 0000-0002-9390-6607, Ali, Ghulam ORCID: 0000-0002-2480-3444, Chung, Kyung Yoon ORCID: 0000-0002-1273-746X, Lee, Ho Jun, Moon, Seong-I., Dutta, Soumen ORCID: 0000-0003-1465-2723, Sun, Seho, Jung, Yeon-Gil, Song, Taeseup and Han, HyukSu (2019). Electrochemically activated cobalt nickel sulfide for an efficient oxygen evolution reaction: partial amorphization and phase control. J. Mater. Chem. A, 7 (8). S. 3592 - 3603. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2050-7496

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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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hong, Yu-Rim UNSPECIFIED UNSPECIFIED UNSPECIFIED Mhin, Sungwook UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Kang-Min UNSPECIFIED UNSPECIFIED UNSPECIFIED Han, Won-Sik UNSPECIFIED UNSPECIFIED UNSPECIFIED Choi, Heechae UNSPECIFIED orcid.org/0000-0002-9390-6607 UNSPECIFIED Ali, Ghulam UNSPECIFIED orcid.org/0000-0002-2480-3444 UNSPECIFIED Chung, Kyung Yoon UNSPECIFIED orcid.org/0000-0002-1273-746X UNSPECIFIED Lee, Ho Jun UNSPECIFIED UNSPECIFIED UNSPECIFIED Moon, Seong-I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dutta, Soumen UNSPECIFIED orcid.org/0000-0003-1465-2723 UNSPECIFIED Sun, Seho UNSPECIFIED UNSPECIFIED UNSPECIFIED Jung, Yeon-Gil UNSPECIFIED UNSPECIFIED UNSPECIFIED Song, Taeseup UNSPECIFIED UNSPECIFIED UNSPECIFIED Han, HyukSu UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-156207
DOI:	10.1039/c8ta10142f
Journal or Publication Title:	J. Mater. Chem. A
Volume:	7
Number:	8
Page Range:	S. 3592 - 3603
Date:	2019
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	2050-7496
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language N-DOPED GRAPHENE; HYDROGEN EVOLUTION; BIFUNCTIONAL ELECTROCATALYST; WATER OXIDATION; NANOPARTICLES; NITROGEN; REDUCTION; PHOSPHIDE; OXIDE; NANOCRYSTALS Multiple languages Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15620