Study on Preparation and Electrical Properties of Ba_(1.03)Ce_(0.8)Eu_(2/3)0.2O_(3-alpha) Solid Electrolyte

摘要

Ba_(1.03)Ce_(0.8)Eu_(2/3)0.2O_(3-alpha) Solid Electrolyte solid electrolyte with nonstoichiornetric 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 approx 1000 deg C, and compared them with those of BaCe_(0.8)Eu_(0.2)O_(3-alpha) and Ba_(0.98)Ce_(0.8)Eu_(0.2)O_(3-alpha). The results indicate that Ba_(1.03)Ce_(0.8)Eu_(0.2)0.2O_(3-alpha)is a single-phase perovskite-type orthorhombic system. It is a pure proton conductor in the temperature range of 600 approx 1000 deg C in hydrogen atmosphere, and its proton conduction is superior to that of BaCe_(0.8)Eu_(0.2)O_(3-alpha) and Ba_(0.98)Ce_(0.8)Eu_(0.2)O_(3-alpha). It is a mixed conductor of oxide ion and electron hole in oxygen atmosphere. At 1000 deg C , the performance of the fuel cell in which Ba_(1.03)Ce_(0.8)Eu_(2/3)0.2O_(3-alpha) as electrolyte is higher than that of BaCe_(0.8)Eu_(0.2)O_(3-alpha) or Ba_(0.98)Ce_(0.8)Eu_(0.2)O_(3-alpha).