A Proton-Conducting In[sup 3+]-Doped SnP[sub 2]O[sub 7] Electrolyte for Intermediate-Temperature Fuel Cells

We report proton conduction in -doped in the temperature range from , and the performance of a -air fuel cell using this material as the electrolyte. The proton conductivity of -doped was more than between 125 and , and a conductivity value of was achieved at . The resulting fuel cell exhibited a reasonable power density of at (electrolyte ), together with perfect tolerance toward 10% CO and good thermal stability in unhumidified conditions.