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
JournalCatalysis Today
DOIs
Publication statusAccepted/In press - 2021

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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