Synthesis and Electrical Properties of New Solid State Electrolyte Materials Ce6-xSmxMoO15-δ(0≤x≤1.2)

Abstract

Abstract: A new solid electrolyte series of oxides Ce_6-xSm_xMoO_15-δ(0≤x≤1.2) were synthesized by sol-gel method.The precursors and the resultant oxide powders were characterized by differential thermal analysis/thermogravimetry(DTA/TG),X-ray Diffraction(XRD) and X-ray Photoelectron Spectroscopy(XPS).The formation temperature of the compounds was found to be as low as 400 ℃.Ce_6-xSm_xMoO_15-δ crystallized to fluorite-related cubic structure.The electrical conductivity of samples was investigated by using AC impedance spectroscopy.Impedance spectra analyses show that the grain-boundary resistance of the solid electrolyte prepared by sol-gel method wad reduced or even eliminated.It shows that the presence of Sm is related with the oxygen-ion conductivity.The highest oxygen-ion conductivity is found in Ce_6-xSm_xMoO_15-δ(x=0.8) reaching 6.67×10^-3 S/cm at 800 ℃. The Ce_6-xSm_xMoO_15-δionic conductor shows a potential application in the intermediate-temperature solid oxide fuel cells(SOFCs).

Key words: Solid state electrolyte, Conductivity, Sol-gel method, SOFCs

CLC Number:

O614.33
O646

TrendMD:

ZHOU De-Feng, BO Qi-Bing, WANG Qiu-Yan, WANG Jing-Ping, LV Min-Feng, LIU Jian-Fen, CAO Xue-Qiang, XING Xian-Ran, MENG Jian . Synthesis and Electrical Properties of New Solid State Electrolyte Materials Ce_6-xSm_xMoO_15-δ(0≤x≤1.2)[J]. Chem. J. Chinese Universities, 2005, 26(10): 1791.

References

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