Abstract
The density functional theory with account for gradient correction (DFT/PBE) and periodical boundary conditions was used to model the main stages of processes occurring in hydrogen low-temperature fuel cells. Modeling was carried out at the example of calculation of catalytic anodic and cathodic processes occurring on the surface of the Pt19 catalyst supported on a SnO2 and water adsorption processes on the surface of a membrane represented by a crystal of metisylene sulfonic acid dihydrate [(CH3)3C6H2SO −3 · H5O +2 ]. It was shown that the most energy-efficient process in the membrane is formation of crystals, in which two stoichiometric water molecules correspond to a single SO3H group. Superstoichiometric water is adsorbed on the crystal surface with the adsorption energy of 0.3–0.6 eV; its transition inside the crystal is energy-consuming (2 eV). Barriers of surface proton conductivity are 0.2–0.3 eV.
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Original Russian Text © T.S. Zyubina, A.S. Zyubin, Yu.A. Dobrovol’skii, V.M. Volokhov, R.V. Pisarev, A.V. Pisareva, L.V. Shmygleva, 2013, published in Elektrokhimiya, 2013, Vol. 49, No. 8, pp. 878–884.
Published on the basis of the lecture in XI Meeting “Fundamental Problems of Solid State Ionics”, Chernogolovka, 2012.
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Zyubina, T.S., Zyubin, A.S., Dobrovol’skii, Y.A. et al. Modeling of processes in fuel cells based on sulfonic acid membranes and platinum clusters. Russ J Electrochem 49, 788–793 (2013). https://doi.org/10.1134/S1023193513080223
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DOI: https://doi.org/10.1134/S1023193513080223