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 journalArticlepeer-review

    121 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
    Volume233
    DOIs
    Publication statusPublished - 2018 Oct 5

    Bibliographical note

    Funding Information:
    This research was supported by the program of the Korea Institute of Science and Technology (KIST) and by the KU-KIST program funded by the Ministry of Science, ICT and Future Planning , and partially supported by the Korea Center for Artificial Photosynthesis through the National Research Foundation of Korea (No. 2014M1A2A2070004 ).

    Publisher Copyright:
    © 2018 Elsevier B.V.

    Copyright:
    Copyright 2019 Elsevier B.V., All rights reserved.

    Keywords

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

    ASJC Scopus subject areas

    • Catalysis
    • General Environmental Science
    • Process Chemistry and Technology

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