Young Woon Kim

Extraordinary high potassium ion conducting polycrystalline solids based on gadolinium oxide–potassium nitrite solid solution

Abstract A new type of potassium ion conducting polycrystalline solid electrolyte was prepared by forming the Gd 2 O 3 –KNO 2 solid solution. Since KNO 2 is dissolved in the Gd 2 O 3 crystal lattice scale, a considerable enhancement in K + ion conductivity was successfully realized. The K + ion conductivity is more than three orders of magnitude higher than that of the well-known K + ion conducting K 2 SO 4 polycrystal solid and the value also exceeds that of K + –β ″ -alumina single crystal, demonstrating the highest ion conductivity among the K + ion conducting solid series.