摘要
用高温固相反应法合成了非化学计量组成的Ba1.05Ce0.8Ho0.2O3-α固体电解质,用粉末X-射线衍射方法鉴定了其晶体结构。用交流阻抗谱技术研究了材料在600℃-1000℃下、湿润氢气和湿润空气气氛中的导电性,测定了其氢-空气燃料电池性能,并与BaCe0.8Ho0.2O3-α的电性能进行了比较。结果表明,Ba1.05Ce0.8Ho0.2O3-α材料为钙钛矿型斜方晶单相结构。在600℃-1000℃温度范围内、湿润氢气和湿润空气气氛中,该材料的电导率高于BaCe0.8Ho0.2O3-α的电导率（1000℃下,在湿润的氢气气氛中它们的电导率分别为2.66×10^-2和1.94×10^-2S·cm^-1;在湿润的空气气氛中分别为4.31×10^-2和1.93×10^-2S·cm-1）;以该材料为固体电解质的氢-空气燃料电池性能优于以BaCe0.8Ho0.2O3-α为固体电解质的氢-空气燃料电池性能（1000℃下,它们的最大氢？空气燃料电池输出功率密度分别为139.8和85.8 mW·cm^-2）。
Ba1.05Ce0.8Ho0.2O3-α solid electrolyte with nonstoiehiometrie composition was synthesized by high temperature solid-state reaction. The crystal structure of the material was determined by XRD analysis. In the temperature range of 600℃ - 1000℃, the conductivity of Ba1.05 Ce0.8 Ho0.2 O3-α in wet hydrogen and wet air was measured by using ae impedance spectroscopy method, the performance of hydrogen-air fuel cell was studied, and compared them with those of BaCe0.8 Ho0.2O3-α. The results indieate that Ba1.05Ce0.8Ho0.2O3-α sinter is of single-phase structure of orthorhomhie perovskite. In the temperature range of 600℃-1000℃, Ba1.05Ce0：8Ho0.2O3-α has higher conduetivities in wet hydrogen and wet air and better performance of hydrogen-air fuel cell than BaCe0.8Ho0.2O3-α. At 1000℃ ,the conductivities of the two materials are 2.66 × 10^2 and 1.94 × 10^-2 S·cm^-1 in wet hydrogen,4.31 × 10^-2 and 1.93 ×10^-2 S · cm^-1 in wet air,and the maximum power output density of the two materials are 139.8 and 85.8 mW·cm^-2, respectively.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2009年第9期1260-1264,共5页
Chemical Research and Application
基金
江苏省高校自然科学基金资助项目(07KJB150126
08KJD150008)
