γ-NiOOH electrocatalyst derived from a nickel dithiooxamide chelate polymer for oxygen evolution reaction in alkaline solutions

Ridwan P. Putra, Ihsan Budi Rachman, Hideyuki Horino, Izabela I. Rzeznicka

Research output: Contribution to journalArticlepeer-review

Abstract

The oxygen evolution reaction (OER) is a key process in number of electrochemical energy conversion technologies that demands the design of efficient electrocatalysts. In this work, catalytically active gamma-nickel oxyhydroxide (γ-NiOOH) was obtained from a two-dimensional (2D) nickel(II) dithiooxamide Ni(dto) chelate polymer via in situ electrochemical transformation in an acetylene black matrix. The transformation was carried out on the surface of a glassy carbon electrode in 1 M KOH solution, in which the nickel(II) centers of the chelate polymer were transformed into nano-sized γ-NiOOH crystallites dispersed in the carbon matrix. The resultant nanostructured catalyst exhibits OER overpotential of 390 mV (at 12 mA/cm2) and a Tafel slope of 328 mV/dec in 1 M KOH solution. The OER overpotential of the catalyst is lower than that of IrO2/C electrode, with the same material loading. The oxygen evolution is initiated by adsorption of hydroxide ions at the Ni metal sites of the layered γ-NiOOH, with a subsequent release of oxygen molecules. This study unfolds the potential of in situ electrochemical transformation of 3d transition metal 2D chelate polymers to fabricate active electrocatalysts.

Original languageEnglish
Pages (from-to)308-315
Number of pages8
JournalCatalysis Today
Volume397-399
DOIs
Publication statusPublished - 2022 Aug 1

Keywords

  • Alkaline
  • Coordination polymers
  • Electrocatalyst
  • Gamma nickel oxyhydroxide
  • Metal-air batteries
  • Oxygen evolution
  • Two-dimensional chelate polymers

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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