1. Kinetics of oxygen reduction on gold nanoparticle/multi-walled carbon nanotube hybrid electrodes in acid media
- Author
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Alexeyeva, Nadezda, Matisen, Leonard, Saar, Agu, Laaksonen, Päivi, Kontturi, Kyösti, and Tammeveski, Kaido
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COLLOIDAL gold , *CHEMICAL kinetics , *CARBON nanotubes , *ELECTROLYTIC reduction , *ELECTROCATALYSIS , *CARBON electrodes , *COMPOSITE materials , *TRANSMISSION electron microscopy - Abstract
Abstract: In this paper, the electrochemical reduction of oxygen has been studied on gold nanoparticle/multi-walled carbon nanotube (AuNP/MWCNT) modified glassy carbon (GC) electrodes in 0.5M H2SO4 using the rotating disk electrode (RDE) method. The AuNP/MWCNT catalysts were prepared by chemical deposition of AuNPs onto MWCNTs spontaneously grafted with 4-nitrophenyl groups. The composite electrode was characterised by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV). The oxygen reduction behaviour of these electrodes was compared with that of a bulk gold electrode. The AuNP/MWCNT catalyst showed a pronounced electrocatalytic activity towards O2 reduction in acid media. The half-wave potential of O2 reduction on the AuNP/MWCNT catalyst shifted ca 80mV to more positive potentials as compared to that of a polished Au electrode. The kinetic parameters of oxygen reduction were determined and the specific activity of the hybrid electrode was slightly higher than that of the bulk Au electrode. [Copyright &y& Elsevier]
- Published
- 2010
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