Study on Preparation and Electrical Properties of Ba_(1.03)Ce_(0.8)Eu_(0.2)O_(3-α) Solid Electrolyte

• 作 者: 仇立干 马桂林 闻荻江
• 机 构: School of Material Engineering, Department of Chemistry, Yancheng Teachers College, Yancheng 224002,
• 出 处: Journal of Rare Earths
• 发表日期: 2004年05期
• 关键词: ceramic purity argon

Ba_(1.03)Ce_(0.8)Eu_(0.2)O_(3-α) solid electrolyte with nonstoichiometric composition was prepared by high temperature solid-state reaction. Phase composition, surface and fracture morphologies of the specimen were characterized by using XRD and SEM, respectively. Ionic conduction was researched by gas concentration cell, the performance of hydrogen-air fuel cell was measured in the temperature range of 600～1000 ℃, and compared them with those of BaCe_(0.8)Eu_(0.2)O_(3-α) and Ba_(0.98)Ce_(0.8)Eu_(0.2)O_(3-α). The results indicate that Ba_(1.03)Ce_(0.8)Eu_(0.2)O_(3-α) is a single-phase perovskite-type orthorhombic system. It is a pure proton conductor in the temperature range of 600～1000 ℃ in hydrogen atmosphere, and its proton conduction is superior to that of BaCe_(0.8)Eu_(0.2)O_(3-α) and Ba_(0.98)Ce_(0.8)Eu_(0.2)O_(3-α). It is a mixed conductor of oxide ion and electron hole in oxygen atmosphere. At 1000 ℃, the performance of the fuel cell in which Ba_(1.03)Ce_(0.8)Eu_(0.2)O_(3-α) as electrolyte is higher than that of BaCe_(0.8)Eu_(0.2)O_(3-α) or Ba_(0.98)Ce_(0.8)Eu_(0.2)O_(3-α).

Phase composition, surface and fracture morphologies of the specimen were characterized by using XRD and SEM (atomic force microscope) , respectively. Ionic conduction was researched by gas concentration cell, the performance of hydrogen-air fuel cell was measured in the temperature range of 600~1000 ° C, and compared with those of BaCe_ (0.8) Eu_ (0.2) O_ (3- α) and Ba_ (0.98) Ce_ (0.8) Eu_ (0.2) O_ (3-α) .The results indicate that Ba_ (1.03) Ce_ (0.8) Eu_ (0.2) O_ (3 -α) is a single-phase perovskite -type orthorhombic system. It is a pure proton conductor in the temperature range of 600 ~ 1000 ℃ in hydrogen atmosphere, and its proton conduction is superior to that of BaCe_ (0.8) Eu_ (0.2) O_ (3-α) and Ba_ 0.98) Ce_ (0.8) Eu_ (0.2) O_ (3-α). It is a mixed conductor of oxide ion and electron hole in oxygen atmosphere. At 1000 ℃, the performance of the fuel cell in which Ba_ (1.03) Ce_ 0.8) Eu (0.2) O_ (3-α) as electrolyte is higher than that of BaCe_ (0.8) Eu_ (0.2) O_ (3-α) or Ba_ (0.98) Ce_ (0.8) Eu_ (0.2) O_ (3-α) .