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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.