プロトン伝導性Sr-Ba-Pb系リン酸塩ガラスを電解質に用いた燃料電池の無加湿運転の可能性

抄録

Dependence of water partial pressure (P_H2O) on the protonic conductivities of phosphate glasses made by a condensation-polymerization process below liquidus temperature has been investigated. Protonic conductivities of Sr-Ba-Pb + W-phosphate glass at 373 K were 4×10^-5 and 6×10^-4 S/cm, at P_H2O = 0.035 and 0.485 atm, respectively. The P_H2O dependence of conductivity for this glass is lower than that for Nafion. When operating under a non-humidified condition, the conductivity remains unchanged with time, and the fuel cell using the glass electrolyte was able to generate power continuously. The phosphate glass is one of the new candidate materials for electrolyte used in fuel cells.