Highly Active Cobalt-Based Electrocatalysts with Facile Incorporation of Dopants for Oxygen Evolution Reaction

Gun hee Moon, Mingquan Yu, Candace Chan, Harun Tüysüz

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In situ formation of electroactive cobalt species for the oxygen evolution reaction is simply achieved by applying an anodic bias to a commercially available cobalt precursor and Nafion binder mixture coated on a glassy carbon electrode. This preparation does not require energy-intensive materials preparation steps or noble metals, yet a low overpotential of 322 mV at 10.2 mA cm −2 and a high current density of more than 300 mA cm −2 at 1.7 V NHE were obtained in 1 m KOH. An operando electrochemical Raman spectroscopy study confirmed the formation of cobalt oxyhydroxide species and the iron stimulated the equilibrium state between Co 3+ and Co 4+ . The iron present in the alkali electrolyte or ink solution effectively activated the cobalt species, and most of the first row transition metals could also enhance the catalytic performance. The concept presented here is one of the simplest strategies for preparing highly active electrocatalysts and is very flexible for the replacement of cobalt by other transition metals.

Original languageEnglish
JournalAngewandte Chemie - International Edition
DOIs
Publication statusPublished - Jan 1 2019

    Fingerprint

Keywords

  • cobalt
  • electrocatalysis
  • Nafion
  • oxygen evolution reaction
  • transition metals

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this