【摘 要】
：
用高温固相反应法制备了Ba0.97Ce0.8Ho0.2O3-α钙钛矿型氧化物固溶体,粉末X射线衍射表明,该固溶体为单相.研究了样品在高温下的离子导电性以及氢-空气燃料电池性能,并与BaCe0
【基金项目】
：
国家自然科学基金;江苏省教育厅自然科学基金
论文部分内容阅读
用高温固相反应法制备了Ba0.97Ce0.8Ho0.2O3-α钙钛矿型氧化物固溶体,粉末X射线衍射表明,该固溶体为单相.研究了样品在高温下的离子导电性以及氢-空气燃料电池性能,并与BaCe0.8Ho0.2O3-α进行比较.结果表明,在潮湿氢气中、600～1000℃,BaCe0.8Ho0.2O3-α几乎表现为纯的质子导电性;在600～900℃时质子迁移数为1;在1000℃时质子的迁移数为0.99,与BaCe0.8Ho0.2O3-α相同;在600～700℃时Ba0.97Ce0.8Ho0.2O3-α也显示了纯的质子导电性,其质子迁移数为1;但在800～1000℃时Ba0.97Ce0 8Ho0.2O3-α的质子迁移数为0.99～0.96,质子导电性略低于BaCe0.8Ho0.2O3-α.在潮湿的空气中、600～1000℃下,这两个样品均显示了较低的质子和氧离子导电性,Ba0.97Ce0.8Ho0.2O3-α的质子和氧离子的迁移数分别为0.01～0.11、0.30～0.31,BaCe0.8Ho0.2O3-α的质子和氧离子迁移数则分别为0.01～0.09、0.27～0.33.在潮湿氢气和空气中,Ba0.97Ce0.8Ho0.2O3-α的电导率均高于BaCe0.8Ho0.2O3-α.以Ba0.97Ce0.8Ho0.2O3-α为固体电解质的氢-空气燃料电池的性能高于BaCe0.8Ho0.2O3-α,在1000℃时,前者燃料电池的最大电流密度和功率密度分别为465 mA/cm2和112 mW/cm2.
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