NiOOH Exfoliation-Free Nickel Octahedra as Highly Active and Durable Electrocatalysts Toward the Oxygen Evolution Reaction in an Alkaline Electrolyte

Byeongyoon Kim, Aram Oh, Mrinal Kanti Kabiraz, Youngmin Hong, Jinwhan Joo, Hionsuck Baik, Sang Il Choi, Kwangyeol Lee

    Research output: Contribution to journalArticlepeer-review

    81 Citations (Scopus)

    Abstract

    A layered β-NiOOH crystal with undercoordinated facets is an active and economically viable nonnoble catalyst for the oxygen evolution reaction (OER) in alkaline electrolytes. However, it is extremely difficult to enclose the β-NiOOH crystal with undercoordinated facets because of its inevitable crystal transformation to γ-NiOOH, resulting in the exfoliation of the catalytic surfaces. Herein, we demonstrate {111}-faceted Ni octahedra as the parent substrates whose surfaces are easily transformed to catalytically active β-NiOOH during the alkaline OER. Electron microscopic measurements demonstrate that the horizontally stacked β-NiOOH on the surfaces of Ni octahedra has resistance to further oxidation to γ-NiOOH. By contrast, significant crystal transformation and thus the exfoliation of the γ-NiOOH sheets can be observed on the surfaces of Ni cubes and rhombic dodecahedra (RDs). Electrocatalytic measurements show that the β-NiOOH formed on Ni octahedra exhibits highly enhanced OER durability compared to the Ni cubes, Ni RDs, and the state-of-the-art Ir/C catalysts.

    Original languageEnglish
    Pages (from-to)10115-10122
    Number of pages8
    JournalACS Applied Materials and Interfaces
    Volume10
    Issue number12
    DOIs
    Publication statusPublished - 2018 Mar 28

    Bibliographical note

    Funding Information:
    This work was supported by National Research Foundation of Korea grants (NRF-2017-R1A2B3005682 and NRF-2016H1D5A1910726, NRF-2017-R1A6A3A01008861), IBS-R023-D1, and KBSI Project E37300. The authors thank Korea Basic Science Institute (KBSI) for the usage of their HRTEM instrument.

    Publisher Copyright:
    © 2018 American Chemical Society.

    ASJC Scopus subject areas

    • General Materials Science

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