Lee, Minoh Oh, Hyung-Suk Cho, Min Kyung Ahn, Jae-Pyoung Hwang, Yun Jeong Min, Byoung Koun 2024-01-19T21:33:10Z 2024-01-19T21:33:10Z 2021-09-04 2018-10-05 0926-3373 https://pubs.kist.re.kr/handle/201004/120803 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. English ELSEVIER SCIENCE BV WATER OXIDATION CATALYST HYDROGEN EVOLUTION SUPERCAPACITOR ELECTRODES OXIDE EFFICIENT NI3S2 METAL FILM NANOPARTICLES PERFORMANCE Activation of a Ni electrocatalyst through spontaneous transformation of nickel sulfide to nickel hydroxide in an oxygen evolution reaction Article 10.1016/j.apcatb.2018.03.083 1 APPLIED CATALYSIS B-ENVIRONMENTAL, v.233, pp.130 - 135 APPLIED CATALYSIS B-ENVIRONMENTAL 233 130 135 scie scopus 000434888600014 2-s2.0-85053012021 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article WATER OXIDATION CATALYST HYDROGEN EVOLUTION SUPERCAPACITOR ELECTRODES OXIDE EFFICIENT NI3S2 METAL FILM NANOPARTICLES PERFORMANCE Electrocatalyst Oxygen evolution reaction Nickel sulfide Nickel hydroxide Metal-chalcogenide