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

Biswal, SK and Ranjan, C (2022) Suppressing H2O2 formation in the oxygen reduction reaction using Co-doped copper oxide electrodes. In: Journal of Materials Chemistry A .

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Official URL: https://doi.org/10.1039/d2ta04349a


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 (CuCoOx/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.

Item Type: Journal Article
Publication: Journal of Materials Chemistry A
Publisher: Royal Society of Chemistry
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Catalyst selectivity; Copper oxides; Electrocatalysts; Electrodes; Electrolytic reduction; Gold compounds; Oxygen; Platinum compounds; Transition metals, Au Catalyst; Co-doped; Doped copper oxides; High activity; High selectivity; Low-costs; Oxide electrodes; Oxygen Reduction; Oxygen reduction reaction; Transition-metal oxides, Transition metal oxides
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 20 Nov 2022 07:06
Last Modified: 20 Nov 2022 07:06
URI: https://eprints.iisc.ac.in/id/eprint/77900

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