Chemical Industry and Engineering Progress ›› 2017, Vol. 36 ›› Issue (09): 3395-3399.DOI: 10.16085/j.issn.1000-6613.2016-2030

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Ce0.8Sm0.2O2-α ceramic prepared by sol-gel method at low temperature and its composite electrolyte in intermediate temperature fuel cells

GUAN Qingmei, WANG Hongtao   

  1. Anhui Provincial Key Laboratory for Degradation and Monitoring of Pollution of the Environment, School of Chemical and Material Engineering, Fuyang Teachers College, Fuyang 236037, Anhui, China
  • Received:2016-11-07 Revised:2017-05-16 Online:2017-09-05 Published:2017-09-05

溶胶-凝胶法低温制备Ce0.8Sm0.2O2-α及其复合电解质的中温燃料电池性能

管清梅, 王洪涛   

  1. 阜阳师范学院化学与材料工程学院, 安徽环境污染物降解与监测省级重点实验室, 安徽 阜阳 236037
  • 通讯作者: 王洪涛,教授,硕士生导师,主要从事电化学和材料化学研究。
  • 作者简介:管清梅(1978-),女,副教授,主要从事物理化学和材料化学研究。E-mail:flyssky@163.com
  • 基金资助:
    国家自然科学基金青年项目(51402052)及安徽省高等学校自然科学基金项目(2015KJ010)。

Abstract: Ce0.8Sm0.2O2-α was synthesized by sol-gel method at 900℃ using Sm2O3,HNO3,(NH4)2Ce(NO3)6,citric acid as raw materials and then compounded with (Li/K)2CO3. The preparation temperature(900℃)is much lower than conventional sintering temperature(1400℃). The sintering temperature of Ce0.8Sm0.2O2-α(SDC) was determined by DSC-TGA. The XRD results showed that there was no reactions between Ce0.8Sm0.2O2-α and (Li/K)2CO3. The SEM examinations revealed that the SDC particle size is uniform,and the surface is uniformly covered by (Li/K)2CO3 that act as the SDC particle binder. The conductivity of the composite electrolyte in dry nitrogen was measured using electrochemical analyzer. The highest conductivity was 3.3×10-2S/cm at 600℃,which is higher than that of single CeO2 material. The H2/O2 fuel cell by the composite electrolyte showed that the electrolyte impedance and polarization impedance under open-circuit condition were 3.13Ω·cm2 and 0.81Ω·cm2,respectively,and generated the maximum power density of 130mW/cm2 at 600℃.

Key words: cerium oxide (CeO2), composites, electrolytes, hydrogen, fuel cells, conductivity

摘要: 以三氧化二钐、浓硝酸、硝酸铈铵、柠檬酸为原料,采用溶胶-凝胶法低温(900℃)制备Ce0.8Sm0.2O2-α(SDC),低于通常高温烧结温度(1400℃),并与(Li/K)2CO3共熔体进行复合。采用DSC-TGA确定制备Ce0.8Sm0.2O2-α的烧结温度。XRD结果表明,(Li/K)2CO3与Ce0.8Sm0.2O2-α复合后没有发生化学反应。SEM图像表明,SDC粒径均匀一致,(Li/K)2CO3作为SDC颗粒黏结剂均匀覆盖SDC颗粒表面。采用电化学工作站研究了复合电解质在400~600℃下干燥氮气气氛中的电导率。结果表明,温度为600℃时,复合电解质在干燥氮气气氛中的电导率达到最大值3.3×10-2S/cm,高于单一二氧化铈材料在相同条件下的电导率。氧分压与电导率关系曲线表明,复合电解质具有良好的氧离子导电性。H2/O2燃料电池性能测试表明复合电解质Ce0.8Sm0.2O2-α-(Li/K)2CO3(SDC-SG-LK)在600℃开路条件下的电解质阻抗、极化阻抗分别为3.13Ω·cm2、0.81Ω·cm2,最大输出功率密度为130mW/cm2

关键词: 二氧化铈, 复合材料, 电解质, 氢, 燃料电池, 电导率

CLC Number: 

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