Activation of a Ni electrocatalyst through spontaneous transformation of nickel sulfide to nickel hydroxide in an oxygen evolution reaction
- Authors
- Lee, Minoh; Oh, Hyung-Suk; Cho, Min Kyung; Ahn, Jae-Pyoung; Hwang, Yun Jeong; Min, Byoung Koun
- Issue Date
- 5-10월-2018
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Electrocatalyst; Oxygen evolution reaction; Nickel sulfide; Nickel hydroxide; Metal-chalcogenide
- Citation
- APPLIED CATALYSIS B-ENVIRONMENTAL, v.233, pp.130 - 135
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED CATALYSIS B-ENVIRONMENTAL
- Volume
- 233
- Start Page
- 130
- End Page
- 135
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/72512
- DOI
- 10.1016/j.apcatb.2018.03.083
- ISSN
- 0926-3373
- Abstract
- Ni-sulfide compounds synthesized on Ni foam by simple thermal sulfurization are employed as electrocatalysts for water oxidation, resulting in superior activity in alkaline electrolyte media. The role of sulfur in Ni-sulfide was found to be an activator that transformed sulfide into hydroxide, which was eventually transformed into (oxy)hydroxide. The Ni-(oxy)hydroxide phase was also found to be layered and/or amorphous. This activated catalyst showed significant enhancement in water oxidation performance with a low overpotential value of 256 WV at current density of 10 mA cm -2. Our observation could offer important insight into metal-chalcogenide electrocatalyst for water oxidation.
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