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Durability of carbon-supported manganese oxide nanoparticles for the oxygen reduction reaction (ORR) in alkaline medium

Lookup NU author(s): Dr Ivan Roche

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Abstract

MnOx/C-based electrocatalysts, prepared by the chemical deposition of manganese oxide nanoparticles on carbon, were tested towards the Oxygen Reduction Reaction (ORR) in their as-synthesized state and after ageing, either in ambient air for a year (mild ageing) or in an O2-saturated molar KOH solution at 80 °C for three weeks (premature ageing). For each electrocatalyst, the morphology and composition were characterised using TEM, XRD and chemical analysis. ORR kinetic parameters were evaluated using the Rotating Disk Electrode (RDE) and Rotating Ring Disk Electrode (RRDE) setups. Whilst the oxygen reduction activity of the electrocatalysts barely changes after mild ageing, it decreases after premature ageing following dramatic modifications to both the chemical and crystalline structures of the carbon-supported MnOx nanoparticles. The peroxide yield also sharply increases after premature ageing. Doping MnOx/C with nickel or magnesium divalent cations is beneficial since it improves both the catalytic activity and selectivity towards the 4-electron ORR pathway, even after ageing.

Publication metadata

Author(s): Roche I, Chaînet E, Chatenet M, Vondrák J

Publication type: Article

Publication status: Published

Journal: Journal of Applied Electrochemistry

Year: 2008

Volume: 38

Issue: 9

Pages: 1195-1201

ISSN (print): 0021-891X

ISSN (electronic): 1572-8838

Publisher: Springer

URL: http://dx.doi.org/10.1007/s10800-008-9537-z

DOI: 10.1007/s10800-008-9537-z

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