Mixed Transition-Metal Oxides on Reduced Graphene Oxide as a Selective Catalyst for Alkaline Oxygen Reduction

Sigrid Wolf*, Michaela Roschger, Boštjan Genorio, Daniel Garstenauer, Viktor Hacker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The development of highly efficient, stable, and selective non-precious-metal catalysts for the oxygen reduction reaction (ORR) in alkaline fuel cell applications is essential. A novel nanocomposite of zinc- and cerium-modified cobalt-manganese oxide on reduced graphene oxide mixed with Vulcan carbon (ZnCe-CMO/rGO-VC) was prepared. Physicochemical characterization reveals uniform distribution of nanoparticles strongly anchored on the carbon support resulting in a high specific surface area with abundant active sites. Electrochemical analyses demonstrate a high selectivity in the presence of ethanol compared to commercial Pt/C and excellent ORR activity and stability with a limiting current density of −3.07 mA cm–2, onset and half-wave potentials of 0.91 and 0.83 V vs reversible hydrogen reference electrode (RHE), respectively, a high electron transfer number, and an outstanding stability of 91%. Such a catalyst could be an efficient and cost-effective alternative to modern noble-metal ORR catalysts in alkaline media.
Original languageEnglish
Pages (from-to)11536-11543
Number of pages8
JournalACS Omega
Volume8
Issue number12
Early online date15 Mar 2023
DOIs
Publication statusPublished - 28 Mar 2023

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Fields of Expertise

  • Mobility & Production
  • Advanced Materials Science

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