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 journalArticle

15 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

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Electrocatalysts
Nickel
Electrolytes
Oxygen
Crystals
Catalysts
Durability
Oxidation
Electrons
Substrates

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

NiOOH Exfoliation-Free Nickel Octahedra as Highly Active and Durable Electrocatalysts Toward the Oxygen Evolution Reaction in an Alkaline Electrolyte. / Kim, Byeongyoon; Oh, Aram; Kabiraz, Mrinal Kanti; Hong, Youngmin; Joo, Jinwhan; Baik, Hionsuck; Choi, Sang Il; Lee, Kwangyeol.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 12, 28.03.2018, p. 10115-10122.

Research output: Contribution to journalArticle

Kim, Byeongyoon ; Oh, Aram ; Kabiraz, Mrinal Kanti ; Hong, Youngmin ; Joo, Jinwhan ; Baik, Hionsuck ; Choi, Sang Il ; Lee, Kwangyeol. / NiOOH Exfoliation-Free Nickel Octahedra as Highly Active and Durable Electrocatalysts Toward the Oxygen Evolution Reaction in an Alkaline Electrolyte. In: ACS Applied Materials and Interfaces. 2018 ; Vol. 10, No. 12. pp. 10115-10122.
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