SnP_2O_7中温固体电解质的制备和导电性能

Fabrication and electrical performance of solid state proton conductor SnP_2O_7 at intermediate temperatures

用固相反应法制备了不同P/Sn物质的量比的SnP2O7,并研究了该电解质在120～260℃范围内的导电性能。XRD分析表明SnP2O7为立方结构。热重分析了电解质在中温范围内的稳定性。用交流阻抗谱测量了电解质电导率,电导率随着HPO3在电解质中的残余量的提高而提高。测试结果表明电解质中起导电作用的主要是HPO3,而SnP2O7主要起支撑作用。最大电导率是在200℃,P/Sn物质的量比为3.0时,干空气条件下为5.1×10-2S/cm,湿空气条件下为6.6×10-2S/cm。

Abstract： SnPeO7 proton conductors of x（P）/x（Sn）=2.0, 2.2, 2.4, 2.6, 2.8, 3.0 was synthesized and characterized as a potential electrolyte for intermediate temperature that operated range of 120-260℃. X-ray diffraction investigation （XRD） showed that SnP2O7 was cubic structure and thermal gravimetric analysis （TG）showed thatSnP2O7 was stable when operated at intermediate temperature. The conductivity, measured using impedance spectroscopy, improved with increasing the molar remains of HPO3 in SnP2OT, this indicates that HPO3 is responsible for the high conductivity and SnP2O7 serves as a supporting matrix. For 3.0P/Sn, the highest proton conductivity were determined to be 5.1× 10^-2 S/cm under dry atmosphere and 6.6× 10^-2S/eraunder wet atmosphere at 200℃, respectively. Because HPOa easily causes deliquescence and exhibits strong acidity, it is critical to develop electrode materials for the intermediate temperature. The mechanism of proton conduction is examined in detail.