期刊
JOURNAL OF POWER SOURCES
卷 199, 期 -, 页码 201-206出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2011.10.038
关键词
High temperature proton conductors (HTPCs); Barium cerates; Nb-doping; Structural analysis; Electrochemical performance
资金
- Ministry of University and Research (MiUR) of Italy
To improve the chemical stability of high temperature proton conductors based on barium cerate, electrolyte powders doped with different amounts of niobium were synthesized by the citrate-nitrate auto-combustion method. Pure single phases of BaCe0.9-xNbxY0.1O3-x (BCYN, 0.03 <= x <= 0.12) were obtained by thermal treatment at 1000 degrees C. Sintering at 1450 degrees C for 10 h produced dense pellets. X-ray absorption spectroscopy allowed to define the dopant ion insertion site and the co-dopant valency. Treatments in pure CO2 atmosphere at 700 degrees C for 3 h and subsequent XRD analysis were carried out to probe the chemical stability of the produced electrolytes. The influence of the presence of Nb5+ on conductivity has been investigated by electrochemical impedance spectroscopy (EIS) measurements. Polarization curves were acquired in the 400-750 degrees C temperature range. (C) 2011 Elsevier B.V. All rights reserved.
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