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Ionic Conduction and Fuel Cell Performance of Ba0.97Ce0.8Ho0.2O3-α Ceramic
Li-gan Qiu
Li-gan Qiu(Department of Chemistry, Yancheng Normal College, Yancheng 224002, China)
Abstract:
The perovskite-type-oxide solid solution Ba0.97Ce0.8Ho0.2O3-α was prepared by high temperature solidstate reaction and its single-phase character was confirmed by X-ray diffraction. The ionic conduction of the sample was investigated using electrical methods at elevated temperatures, and the performance of the hydrogen-air fuel cell using the sample as solid electrolyte was measured, which were compared with those of BaCe0.8Ho0.2O3 - α. In wet hydrogen, BaCe0.8 Ho0.2 O3 - α almost exhibits pure protonic conduction at 600-1000 ℃, and its protonic transport number is 1 at 600-900 ℃ and 0.99 at 1000 ℃. Similarly,Ba0.97Ce0.8Ho0.2O3-α exhibits pure protonic conduction with the protonic transport number of 1 at 600-700 ℃, but its protonic conduction is slightly lower than that of BaCe0.8Ho0.2O3-α, and the protonic transport number are 0.99-0.96 at 800-1000 ℃. In wet air, the two samples both show low protonic and oxide ionic conduction. For Ba0.97Ce0.8Ho0.2O3-α, the protonic and oxide ionic transport numbers are 0.01-0.11 and 0.30-0.31 respectively, and for BaCe0.8Ho0.2O3-α, 0.01-0.09 and 0.27-0.33 respectively. Ionic conductivities of Ba0.97Ce0.8Ho0.2O3-α are higher than those of BaCe0.8Ho0.2O3-α under wet hydrogen and wet air. The performance of the fuel cell using Ba0.97Ce0.8Ho0.2O3-α as solid electrolyte is better than that of BaCe0.8Ho0.2O3-α. At 1000 ℃, its maximum short-circuit current density and power output density are 465 mA/cm2 and 112 mW/cm2, respectively.
Key words:  Ba0.97Ce0.8Ho0.2O3-α, Protonic conduction, Conductivity, Gas concentration cell, Fuel cell
FundProject:
Ba0.97Ce0.8Ho0.2O3-α陶瓷的离子导电性及其燃料电池性能
仇立干*
盐城师范学院化学系,盐城224002
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BaCe0.8Ho0.2O3-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.
关键词:  Ba0.97Ce0.8Ho0.2O3-α  质子导电性  电导率  气体浓差电池  燃料电池
DOI:10.1360/cjcp2006.19(4).347.5
分类号: