Novel Proton Conducting Ceramics for Solid State Fuel Cells

Abstract
Novel proton conducting ceramics based on oxyacid salts, e.g. Li2SO4, K3PO4 and RbNO3 have been prepared. High proton conduction normally appears in the cubic symmetry structures of these ceramics. The structural and electrical properties depend upon the ceramic composition and sintering process. These oxyacid salt ceramics have a proton conductivity of the order of 10−2 S/cm at 600°C, the highest value of 10 −1 S/cm at 600 °C was obtained for Li2SO4-Al2O3 ceramics. The oxyacid salt ceramics have been used in intermediate temperature (500 °C – 650 °C) solid state fuel cells, but they can also be used for high temperature fuel cells. The performance of the oxyacid salt ceramics fuel cell was mainly limited by the electrode materials, not by the electrolyte.

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