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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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 (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 |
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| 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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