Synthesis and characterization of highly loaded Pt/carbon xerogel catalysts prepared by the strong electrostatic adsorption method

Job, Nathalie;Maillard, Frédéric;Chatenet, Marian;Gommes, Cédric J.;Pirard, Jean-Paul;et.al.
(2010) 10th International Symposium on the Scientific Bases for the Preparation of Heterogeneous Catalysts — Location: Louvain-la-neuve, Belgique (11.July.2010)

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  • Job, NathalieUliège
    Author
  • Maillard, FrédéricCNRS-Grenoble
    Author
  • Chatenet, MarianCNRS-Grenoble
    Author
  • Gommes, Cédric J.Uliège
    Author
  • Hermans, SophieUCLouvain
    Author
  • Pirard, Jean-PaulUliège
    Author
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Abstract
In order to decrease the mass transport limitations reported in classical PEMFC electrodes, Pt/carbon xerogel catalysts have great potential to replace Pt/carbon black catalysts. These nanostructured materials with well defined pore texture allow for better gas/water diffusion and better contact between the platinum particles and the ionomer (Nafion®). Pt/carbon xerogel catalysts with high metal content (~ 25 wt.%) and high metal dispersion (nanoparticles ca. 2 nm in size) were prepared via the ‘Strong Electrostatic Adsorption’ method; the impregnation-drying-reduction step with H2PtCl6 was repeated until the desired metal loading was achieved. However, both physico-chemical and electrochemical characterization show that the use of H2PtCl6 leads to Pt catalysts poisoned with chlorine, especially if the reduction temperature is lower than 450 °C. This induces a dramatic decrease of the Pt utilization ratio in the final PEMFC catalytic layer.
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Job, N., Maillard, F., Chatenet, M., Gommes, C. J., Lambert, S., Hermans, S., Regalbuto, J. R., & Pirard, J.-P. (2010). Synthesis and characterization of highly loaded Pt/carbon xerogel catalysts prepared by the strong electrostatic adsorption method. Studies in Surface Science and Catalysis, 175(175), 169-176. https://doi.org/10.1016/S0167-2991(10)75021-7 (Original work published 2010)