氧离子导体La1.9Ba0.1Mo2O9-α的合成及其电性能研究

Synthesis and Electrical Properties of Oxide-ion Conductor La_(1.9)Ba_(0.1)Mo_2O_(9-α)

通过固相法合成了La_1.9Ba_0.1Mo_2O_(9-α)氧离子导体,对样品进行了XRD、SEM表征,采用交流阻抗谱、氧浓差电池、氧泵等电化学方法研究了该陶瓷样品在600～1000℃下的离子导电特性。结果表明,该陶瓷样品在氧化性气氛中是纯的氧离子导体,1000℃时的氧离子电导率达到0.09S·cm-1,高于母体La_2Mo_2O_9的氧离子电导率。本文还研究了样品的燃料电池性能,在1000℃时氢气/氧气燃料电池的最大输出电流密度为280mA·cm^-2,最大输出功率密度为112mW·cm^-2。

Oxide ionic conductor La1.9Ba0.1Mo2O（9-α） was prepared by solid-state reaction method. The obtained ceramics were characterized by SEM and XRD. The ionic conduction of specimen was investigated by AC impedance spectra, oxygen concentration cell and electrochemical oxygen permeation （oxygen pumping） methods at the range of 600~1 000 ℃. In oxidizing atmospheres, the specimen was a pure oxide ionic conductor with a maximal oxide-ionic conductivity of 0.09 S·cm^-1 at 1 000 ℃, which is higher than that of parent La2Mo2O9. Also, the H2/O2 fuel cell performances of La1.9Ba0.1Mo2O（9-α） were studied, the maximal output of current density and power density were 280 mA·cm^-2 and 112 mW·cm^-2 at 1 000 ℃, respectively.