A Sb‐doped SnP₂O₇ Solid Proton Conductor for Intermediate Temperature Fuel Cells

Abstract

Abstract Sb‐doped SnP 2 O 7 were prepared and characterised with XRD, FTIR, SEM and EIS. The preparation parameters were optimised taking into consideration the influence of H 3 PO 4 content in the reactants and P m O n impurities. Conductivities of SnP 2 O 7 with different Sb doping levels were studied from 100 to 300 °C in un‐humidified air. The conductivity of 20 mol‐% Sb‐doped SnP 2 O 7 was greater than 0.1 S cm –1 at 300 °C. The effect of heat treatment was identified as an important factor in the preparation of the proton conductors. The time dependence of the conductivity demonstrated Sb‐doped SnP 2 O 7 as a promising intermediate temperature solid proton conductor.