Activation of a Ni electrocatalyst through spontaneous transformation of nickel sulfide to nickel hydroxide in an oxygen evolution reaction

Title
Activation of a Ni electrocatalyst through spontaneous transformation of nickel sulfide to nickel hydroxide in an oxygen evolution reaction
Authors
안재평민병권황윤정조민경오형석이민오
Keywords
Electrocatalyst; Oxygen evolution reaction; Nickel sulfide; Nickel hydroxide
Issue Date
2018-10
Publisher
Applied catalysis B, Environmental
Citation
VOL 233-135
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 mV at current density of 10 mA cm− 2. Our observation could offer important insight into metal-chalcogenide electrocatalyst for water oxidation.
URI
http://pubs.kist.re.kr/handle/201004/67485
ISSN
0926-3373
Appears in Collections:
KIST Publication > Article
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