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

Minoh Lee, Hyung Suk Oh, Min Kyung Cho, Jae Pyoung Ahn, Yun Jeong Hwang, Byoung Koun Min

Research output: Contribution to journalArticle

31 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)130-135
Number of pages6
JournalApplied Catalysis B: Environmental
DOIs
Publication statusPublished - 2018 Oct 5

Keywords

  • Electrocatalyst
  • Metal-chalcogenide
  • Nickel hydroxide
  • Nickel sulfide
  • Oxygen evolution reaction

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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