Citation: QIU Li-Gan, WANG Mao-Yuan, SUN Yu-Feng, WANG Ting-Mei. Chemical Stability and Electrical Properties of Ba_1.03Ce_0.9-xZr_xTm_0.1O_3-α Solid Electrolytes[J]. Chinese Journal of Inorganic Chemistry, ;2012, 28(12): 2643-2649. shu

Chemical Stability and Electrical Properties of Ba_1.03Ce_0.9-xZr_xTm_0.1O_3-α Solid Electrolytes

1.
School of Chemistry and Chemical Engineering, Yancheng Teachers University, Yancheng, Jiangsu 224051, China

Corresponding author: QIU Li-Gan,
Received Date: 2 January 2012
Available Online: 11 June 2012
Fund Project: 江苏省高校“青蓝工程”和江苏省高校自然科学基金(No.07KJB150126)资助项目. (No.07KJB150126)

Ba_1.03Ce_0.9-xZr_xTm_0.1O_3-α(x=0.2, 0.4) solid electrolytes with nonstoichiometric composition were prepared by high temperature solid-state reaction. Phase composition and fracture morphologies of the two materials were characterized by using XRD and SEM, respectively. Chemical stability against carbon dioxide and water steam at 900 ℃ was tested. Ionic conduction was studied by using gas concentration cell and ac impedance spectroscopy methods, and the performances of the hydrogen-air fuel cells using the two materials as solid electrolytes were evaluated in the temperature range of 500~900 ℃. The results indicate that the material with x of 0.2 is a single-phase perovskite-type orthorhombic system, and the material with x of 0.4 is a single-phase perovskite-type cubic system. They both have high density and good chemical stability. In wet hydrogen, Ba_1.03Ce_0.7Zr_0.2Tm_0.1O_3-α shows a pure ionic conduction, but Ba_1.03Ce_0.5Zr_0.4Tm_0.1O_3-α shows a mixed conduction of ion and electron from 500 to 900 ℃. The two materials both show a mixed conduction of proton, oxide ion and electronic hole in wet air, and a mixed conduction of proton, oxide ion and electron in hydrogen-air fuel cell. The fuel cells using the two materials as solid electrolytes can both work stably. The ionic conduction and performance of the hydrogen-air fuel cell of Ba_1.03Ce_0.7Zr_0.2Tm_0.1O_3-α are superior to those of Ba_1.03Ce_0.5Zr_0.4Tm_0.1O_3-α under the same experimental conditions.
- Ba_1.03Ce_0.9-xZr_xTm_0.1O_3-α;chemical stability;ionic conduction;fuel cell
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Chemical Stability and Electrical Properties of Ba1.03Ce0.9-xZrxTm0.1O3-α Solid Electrolytes

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通讯作者: 陈斌, bchen63@163.com

Chemical Stability and Electrical Properties of Ba_1.03Ce_0.9-xZr_xTm_0.1O_3-α Solid Electrolytes