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The object of the present work is the thermodynamic study of the proton ceramic fuel cell; particular attention is given to evaluate and maximize the generated power density by a single cell of Protonic Ceramic Fuel Cell (PCFC). In this work, the real potential is given by the difference between the Nernst potential and the reel polarizations generated during the PCFC operation. The activation polarization of the chemical reactions in the anode and the cathode, the losses due to the species concentration in both electrodes (anode and cathode) and the ohmic losses produced by the Joule's effect in the electrolyte and both electrodes (anode and cathode) are considered as the reel polarizations. The obtained results show that the PCFC power density is proportional to the variations of the operating temperature and the oxygen concentration in the oxidizer; conversely, it is inversely proportional to the evolutions of the fuel humidification and the thicknesses of the electrolyte.

In the present study, a CFD (computational fluid dynamics) three-dimensional model is performed to investigate the effects of the inlet temperature on the power density, pressure and local transport phenomena of a single cell PEMFC (proton exchange membrane fuel cell) with straight channels. Deferent inlet temperatures of the reactants (333, 343 and 353 K) have been investigated using ANSYS-FLUENT. The interest of our work is focused on obtaining I-P and I-V curves as well as the pressure, hydrogen, oxygen and water mass fraction profiles to analyze the effect of the oxygen and hydrogen inlet temperature on the current, voltage and power densities of the studied PEMFC. From the results obtained its appears that the variation in the inlet temperature values of the PEMFC has a significant influence on the cell performances at medium and higher current density. Therefore, the results analysis of the three-dimensional and single-phase model indicates that the increase in the reactants’ inlet temperature of the studied PEMFC shows a negative impact on the generated power densities, which have an inversely proportional effect.