Issue 41, 2022

Suppressing H2O2 formation in the oxygen reduction reaction using Co-doped copper oxide electrodes

Abstract

Transition metal oxides form the basis of promising oxygen reduction electrocatalysts due to their low cost, high activity, and abundance on the planet. A new class of Co-doped CuOx (Cu[Co]Ox/Au) catalyst was found to exhibit high activity and selectivity for the complete reduction of oxygen to water. Cu-rich doped-Cu0.8Co0.2Ox/Au electrodes exhibited nearly 97.5% selectivity for water compared to either CuOx/Au (80%) or CoOx/Au (70%). Cu0.8Co0.2Ox/Au exhibited higher activity, stability, and better selectivity over a wide potential range when compared to well-known ORR catalysts such as Pt. In situ Raman spectroscopy revealed that the introduction of Co into CuOx resulted in the formation of under-coordinated Co centers within CuOx frameworks. These under-coordinated Co centers act as active sites for the scission of O–O bonds resulting in preferential formation of 4e reduction products. The doped electrode also demonstrated a superior hydrogen peroxide reduction ability.

Graphical abstract: Suppressing H2O2 formation in the oxygen reduction reaction using Co-doped copper oxide electrodes

Supplementary files

Article information

Article type
Paper
Submitted
31 Mey 2022
Accepted
18 Sep 2022
First published
19 Sep 2022

J. Mater. Chem. A, 2022,10, 22042-22057

Suppressing H2O2 formation in the oxygen reduction reaction using Co-doped copper oxide electrodes

S. K. Biswal and C. Ranjan, J. Mater. Chem. A, 2022, 10, 22042 DOI: 10.1039/D2TA04349A

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