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The carbon-dispersed bimetallic PdNi was prepared by borohydride reduction method using PdCl2 and NiCl2 as precursors in a THF solution. The PdNi loading (mg cm-2) and PdNi weight percentage /carbon Vulcan (PdNi wt%) were optimized, by using the Simplex method. At optimum condition of PdNi loading and PdNi wt% the Electrode Membrane Assembly Performance was evaluated, using the PdNi electrocatalyst as cathode and Pt-Etek carbon cloth (0.5 mg cm-2) as anode. The maximum power density (122 mWcm-2) was attained with 45% of PdNi wt%, at 30 psi and 80 °C. On the other hand, the electrochemical impedance spectroscopy (EIS) was used to investigate the catalytic activity and the mechanism of the Oxygen Reduction Reaction (ORR) on PdNi, in 0.5M H2SO4. The Nyquist and Bode spectra of PdNi electrocatalyst present one or two time constants depending on the electrode potential, E applied. The time constants were associated to the O2 to H2O multi-electron charge transfer reaction (n=4e-) and reduction of H2O2 to produce H2O (n=2e-). The Tafel slope (- b=0.066 Vdec-1) and the charge transfer coefficient (α=0.89) were obtained from the impedance spectra, at optimum condition of PdNi loading and PdNi wt%.
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