Abstract
A novel method was developed to synthesize bi-metallic nanoparticles (Au–Pt) on boron-doped diamond (BDD) substrate. This method consisted of (a) deposition of a small amount of gold (equivalent to a few monolayers) by sputtering on the BDD surface, (b) heat treatment of the obtained sample at 600 °C in air, resulting in the formation of stable nanoparticles on BDD (Au/BDD electrode), (c) electrodeposition of Pt on the Au/BDD surface occurring preferentially on the Au nanoparticles, and finally (d) heat treatment at 400 °C to enhance the interaction between Au and Pt. The ratio between Au and Pt nanoparticles can be modified by modifying the amount of electrodeposited Pt and was estimated using cyclic voltammetry. These Pt-Au/BDD composite electrodes were used to study oxygen reduction using both potential sweep (cyclic voltammetry) and hydrodynamic (turbine electrochemical cell) methods.
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Acknowledgements
Financial support from the Fonds National Suisse de la Recherche Scientifique is gratefully acknowledged. The authors are thankful to the Swiss Center for Electronics and Microtechnology (CSEM, Neuchâtel) for providing BDD electrodes and to the Thin Film Physics Laboratory (LPCM) and the Interdisciplinary Center of Electron Microscopy (CIME), both at the Ecole Polytechnique Fédérale de Lausanne (EPFL), for gold sputtering and SEM analysis, respectively.
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El Roustom, B., Siné, G., Fóti, G. et al. A novel method for the preparation of bi-metallic (Pt–Au) nanoparticles on boron doped diamond (BDD) substrate: application to the oxygen reduction reaction. J Appl Electrochem 37, 1227–1236 (2007). https://doi.org/10.1007/s10800-007-9359-4
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DOI: https://doi.org/10.1007/s10800-007-9359-4