Abstract
The oxygen reduction reaction (ORR) in acid media can be catalyzed on gold electrodes when the surface is activated by mechanical or electrochemical pretreatments. The activation is caused by increased surface roughness and defects, or asperities. After activation, a slow recrystallization of the surface as a function of relaxation time leads to deactivation of the surface for the ORR. After removal of active centers, the surface is not affected over time, which reveals that the surface recrystallization is associated with the deactivation. Experiments using various amounts of Au nanoparticles (AuNPs) immobilized on glassy carbon (GC) show a positive shift of peak potential of oxygen reduction and peroxide oxidation with increasing particle coverage.
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Acknowledgments
We acknowledge the support by Gregor Jatzlauk, who has recorded a number of AFM images, and the kind help of Nanjie Hu (Institute of Geology, University of Greifswald) for recording the SEM images.
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The authors dedicate this paper to Stephen Fletcher on the occasion of his 65th birthday. FS would like to acknowledge Stephen’s readiness to discuss at any time electrochemical problems, historical views, as well as the subtleties of the English language.
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Jeyabharathi, C., Hasse, U., Ahrens, P. et al. Oxygen electroreduction on polycrystalline gold electrodes and on gold nanoparticle-modified glassy carbon electrodes. J Solid State Electrochem 18, 3299–3306 (2014). https://doi.org/10.1007/s10008-014-2657-y
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DOI: https://doi.org/10.1007/s10008-014-2657-y