Electrocatalytic Reduction of Oxygen at Au Nanoparticles–Manganese Oxide Nanoparticle Binary Catalysts
説明
The electrocatalytic reduction of molecular oxygen (O 2 ) has been performed in O 2 -saturated 0.5 M KOH solution at binary catalysts of Au nanoparticles and manganese oxide (MnOx) nanoparticles electrodeposited onto glassy carbon (GC) electrodes. Cyclic voltammetric (CV) and rotating ring-disk electrode (RRDE) techniques have been utilized in this study. CV measurements showed that the electrochemically deposited MnOx nanoparticles have a good catalytic activity toward the disproportionation of hydrogen peroxide (HO 2 - in alkaline media) to water and O 2 . A significant positive shift of the peak potential of the oxygen reduction reaction (ORR) was observed upon loading Au nanoparticles onto the GC substrate. The combined use of MnOx and Au nanoparticles resulted in the occurrence of the ORR at a potential close to that obtained at Pt electrodes, supporting an apparent four-electron reduction pathway as revealed from the RRDE voltammetric results. The current study proposed a novel binary catalyst system (composed of metal/metal oxide nanoparticles) as a very promising candidate to replace the costly Pt-based electrocatalysts in alkaline air electrodes.
収録刊行物
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- Journal of The Electrochemical Society
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Journal of The Electrochemical Society 153 (7), A1365-, 2006
The Electrochemical Society