Performance of an Intermediate-Temperature Fuel Cell Using a Proton-Conducting Sn[sub 0.9]In[sub 0.1]P[sub 2]O[sub 7] Electrolyte

Abstract

Performance of a fuel cell using as the electrolyte was evaluated in the temperature range of under unhumidified conditions. The IR drop and electrode overpotential of the cell were measured separately by the current interruption method. The dc conductivity values of the electrolyte between 150 and , estimated from the IR drop, were comparable to the ac conductivity values of the electrolyte. The cell performance was improved by forming an intermediate layer consisting of and catalyst powders at the interface between the electrolyte and cathode, which significantly reduced the cathode polarization. As a result, the peak power density reached at using the -thick electrolyte. The present fuel cell also showed high stability at low relative humidities and 10% CO concentration.