Electrochemical Characteristics of Pd Anode Catalyst Modified with TiO[sub 2] Nanoparticles in Polymer Electrolyte Fuel Cell

The effect of modification of the anodes in polymer electrolyte fuel cells was investigated using pure and a mixture. The modification of anode catalyst with increased the activity for electrochemical oxidation under pure , and the -modified anode catalyst showed high activity as well as the catalyst. The cell voltages obtained at a current density of for and -modified were as high as . The addition of increased the dispersion of metal particles, which resulted in an increase in the active surface area of the catalyst. In accordance with this result, CO pulse titration analysis showed that the metal dispersion of was higher than that of pure catalyst. The effect of addition on the performances of the cell with a Pd anode in a CO-contaminated fuel was also examined. These results show that the has a higher CO tolerance than catalyst for maintaining high activity for electrochemical oxidation of in pure .