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Preparation and Electrical Property of Ba 1.03 Ce 0.8 Ho 0.2 O 3− α Solid Electrolyte
Author(s) -
WANG Maoyuan,
QIU Ligan,
SUN Yufeng
Publication year - 2009
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200990210
Subject(s) - chemistry , ionic bonding , analytical chemistry (journal) , electrolyte , oxide , ionic conductivity , orthorhombic crystal system , proton conductor , perovskite (structure) , hydrogen , atmospheric temperature range , phase (matter) , ion , inorganic chemistry , crystallography , crystal structure , electrode , physics , organic chemistry , chromatography , meteorology
Ba 1.03 Ce 0.8 Ho 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 material were characterized by using XRD and SEM, respectively. Ionic transport number and conductivity of the material were measured by gas concentration cell and ac impedance spectroscopy methods in the temperature range of 600–1000°C in dry air, wet air and wet hydrogen, respectively. Ionic conduction was researched and compared with those of BaCe 0.8 Ho 0.2 O 3− α and Ba 0.97 Ce 0.8 Ho 0.2 O 3− α . The results indicate that Ba 1.03 Ce 0.8 Ho 0.2 O 3− α is a single‐phase perovskite‐type orthorhombic system. In the temperature range of 600–1000°C, it is a mixed conductor of oxide ion and electron hole with the oxide ionic transport number of 0.10–0.36 in dry air atmosphere, a mixed conductor of proton, oxide ion and electronic hole with the protonic transport number of 0.11–0.01 and the oxide ionic transport number of 0.34–0.30 in wet air atmosphere, and a pure protonic conductor with the protonic transport number of 1 in wet hydrogen atmosphere. Ba 1.03 Ce 0.8 Ho 0.2 O 3− α has the highest conductivities (3.92×10 −2 S·cm −1 in dry air, 3.46×10 −2 S·cm −1 in wet air, 2.10×10 −2 S·cm −1 in wet hydrogen, at 1000°C) among the three materials, and the ionic conduction is superior to that of BaCe 0.8 Ho 0.2 O 3− α and Ba 0.97 Ce 0.8 Ho 0.2 O 3− α under the experimental conditions.