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Ionic Conduction and Application of Ba 1.03 Ce 0.8 Tm 0.2 O 3− α Ceramic
Author(s) -
Qiu Ligan,
Wang Maoyuan
Publication year - 2011
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.201190143
Subject(s) - chemistry , electrolyte , ionic conductivity , hydrogen , orthorhombic crystal system , dielectric spectroscopy , solid oxide fuel cell , ceramic , perovskite (structure) , proton conductor , ionic bonding , oxide , inorganic chemistry , analytical chemistry (journal) , electrode , ion , electrochemistry , crystal structure , crystallography , organic chemistry , chromatography
Abstract Ba 1.03 Ce 0.8 Tm 0.2 O 3− α ceramic with orthorhombic perovskite structure was prepared by conventional solid‐state reaction. The conductivity and ionic transport number of Ba 1.03 Ce 0.8 Tm 0.2 O 3− α were measured by ac impedance spectroscopy and gas concentration cell methods in the temperature range of 500–900°C in wet hydrogen and wet air. Using the ceramic as solid electrolyte and porous platinum as electrodes, the hydrogen‐air fuel cell was constructed, and the cell performance was examined at 500–900°C. The results indicate that the specimen is a pure ionic conductor with the ionic transport number of 1 at 500–900°C in wet hydrogen. In wet air, the specimen is a mixed conductor of proton, oxide ion and electron hole. The protonic transport numbers are 0.071–0.018, and the oxide ionic transport numbers are 0.273–0.365. The conductivities of Ba 1.03 Ce 0.8 Tm 0.2 O 3− α under wet hydrogen, wet air or fuel cell atmosphere are higher than those of Ba 1.03 Ce 0.8 RE 0.2 O 3− α (REY, Eu, Ho) reported previously by us. The fuel cell can work stably. At 900°C, the maximum power output density is 122.7 mW·cm −2 , which is higher than that of our previous cell using Ba 1.03 Ce 0.8 RE 0.2 O 3− α (REY, Eu, Ho) as electrolyte.