Abstract
Three Pt-based catalysts prepared in different radiolytic conditions and supported on graphite powder were packed into a carbon paste electrode configuration. They were compared to each other, to the commercial (Pt) deposited on activated carbon powder (Johnson Matthey) and to pure Vulcan XC-72 for their respective abilities toward the hydrogen evolution reaction (HER). The Tafel parameters were determined for all these electrodes. From the I–V curves and their quantitative treatment, the following order of activity emerged unambiguously and reads: (PtCO)2 (fcc structure) > (PtCO)1 (Chini cluster) > (Pt)neat > (Pt)JM (Johnson Matthey) ≫ (Vulcan XC-72). As expected, all the Pt-loaded electrodes were more efficient than Vulcan XC-72. The classification appears to be linked with the mean nanoparticle size, and for comparable sizes, with the surface morphology of the materials. The results and the stability of the electrodes suggest that the small particle sizes and the good dispersity on the carbon support were maintained during the HER.
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Acknowledgements
This work was supported by the CNRS (UMR 8000) and the University Paris Sud XI. The authors are gratefully indebted to P. Beaunier, Laboratoire de Rèactivité de Surfaces, Paris VI, for her contribution in characterization experiments through electron microscopy. F. Porcher is thanked for his help in several irradiation and impregnation experiments.
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Remita, H., Siril, P.F., Mbomekalle, IM. et al. Activity evaluation of carbon paste electrodes loaded with pt nanoparticles prepared in different radiolytic conditions. J Solid State Electrochem 10, 506–511 (2006). https://doi.org/10.1007/s10008-005-0005-y
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DOI: https://doi.org/10.1007/s10008-005-0005-y