Proton conductive YSZ-phosphate composite electrolyte for H2S SOFC

A new oxide-salt composite electrolyte, YSZ–K3PO4–Ca3(PO4)2, shows proton conductivity in the order of 10−2 S/cm at 700 °C. The proton transport number, determined using a hydrogen concentration cell, rises from more than 93% at 550 °C to 99% at 700 °C. The composite electrolyte is chemically stable in H2S containing atmosphere, and so is a good candidate electrolyte material for H2S solid oxide fuel cells applications.