Optimization of PT-Doped Kocite(Trademark) Electrodes in H3PO4Fuel Cells.

摘要

The use of UOP Pt-doped Kocite(Trademark) materials as low cost air and/or fuel electrocatalysts in phosphoric acid electrolyte fuel cells is being optimized. Kocite materials are composite structures consisting of pyropolymers chemically bonded to refractory substrates. Fuel cell electrodes are fabricated from these materials and tested as anodes or cathodes in model fuel cells with Teflon bonded Pt black electrodes as counter electrodes. Kocite materials are currently being produced in 200-400 gram quantities using two types of high surface area aluminas. Lifetime testing of Kocite electrodes as cathodes indicates no catalyst deterioration occurs for periods in excess of 500 hours for temperatures from 140 to 180C. Both the thickness and density of the catalyst layer have been varied as part of the program to optimize the electrode structure. Preliminary results indicate little change in performance with catalyst layer density, but suggest that an improved performance may be obtainable with a thinner catalyst layer.