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Titanium dioxide (TiO2) samples prepared by different thermal treatments were incorporated in the cathode catalyst layer of a polymer electrolyte membrane or proton exchange membrane (PEM) fuel cell. Increasing the TiO2 treatment temperature (500–800 o C for 3 h) resulted in an increased rutile phase content and crystal size, but decreased textural properties of the obtained TiO2. Incorporation of TiO2 prepared at the appropriate temperature in the carbon-supported PtPd catalyst (PtPd/C) layer positively affected the catalyst dispersion, electrochemical surface area and electrical conductivity of catalyst layer, but did not affect the electron pathway of the oxygen reduction reaction (ORR) of PtPd/C catalysts. Overall, the PtPd/C catalyst with TiO2 calcined at 800 o C (T800-PtPd/C) exhibited the highest ORR activity (486 mA/cm 2 at 0.6 V) both in an acid solution and in a PEM fuel cell under a H2/O2 environment at atmospheric pressure compared to those for the Pt/C, PtPd/C and the other TiO2PtPd/C catalysts.

Incorporation of TiO2 into the PtPd/C Catalyst Layer for Improvement ORR Activity and Water Management