Intermediate Temperature Electrochemical Properties of Al3+ and K+ Double Doped Strontium Silicate

摘要

In this study, K + and Al 3+ double doped strontium silicate was synthesized via a solid state reactionmethod using strontium carbonate, silicon dioxide, potassium carbonate and aluminum trioxide as rawmaterials. Intermediate temperature conductivities and fuel cell properties of Sr 0.6 K 0.4 Si 0.9 Al 0.1 O3-aelectrolyte were studied. X-ray diffractions of Sr 0.6 K 0.4 SiO3-aand Sr 0.6 K 0.4 Si 0.9 Al 0.1 O3-aresults showedthat the second phase of K 2 Si 2 O 5 can be effectively inhibited when two metal oxides are doped. Therelation between conductivity and temperature of the samples indicated that the curves agreed well withthe Arrhenius formula. Sr 0.6 K 0.4 Si 0.9 Al 0.1 O3-ashowed the highest maximum power density of 44.2mW·cm -2 at 800 °C.