Preparation and electrical conductivity of KTaO3-based proton conductor

KTaO3 and KTa0.9M0.1O3-alpha (M = Ti, Hf, Zr) were prepared by solid state reaction at 1330 degrees C for 2 h and characterized by x-ray diffraction. The AC impedance technique was used to analyze the sintered solid electrolytes in 1%H2/Ar and dry air atmosphere. Among KTa0.9M0.1O3-alpha (M = Ti, Hf, Zr), KTa0.9Zr0.1O3-alpha displays the highest conductivity in 1%H2/Ar atmosphere. The carriers transport numbers of solid electrolytes were measured by concentration cell method. The results show KTa0.9Zr0.1O3-alpha is a pure proton conductor below 525 degrees C. Stability tests show that KTa0.9Zr0.1O3-alpha has good chemical stability against CO2 and H2O.

Automated summary

KTaO3 and KTa0.9M0.1O3-alpha (M = Ti, Hf, Zr) were prepared and characterized. Among them, KTa0.9Zr0.1O3-alpha exhibited the highest conductivity in 1%H2/Ar atmosphere and acted as a pure proton conductor below 525 degrees C. Additionally, KTa0.9Zr0.1O3-alpha showed good chemical stability against CO2 and H2O.