Structural analysis, phase stability and electrochemical characterization of Nb doped BaCe0.9Y0.1O3-x electrolyte for IT-SOFCs

被引：17
|
作者：
Di Bartolomeo, Elisabetta [1 ,2 ]
D'Epifanio, Alessandra [1 ,2 ]
Pugnalini, Chiara [1 ,2 ]
Giannici, Francesco [3 ]
Longo, Alessandro
Martorana, Antonino [3 ,4 ]
Licoccia, Silvia [1 ,2 ]
机构：
[1] Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, Via Ric Sci 1, I-00133 Rome, Italy
[2] Univ Roma Tor Vergata, Ctr NAST, I-00133 Rome, Italy
[3] Univ Palermo, Dipartimento Chim Stanislao Cannizzaro, I-90128 Palermo, Italy
[4] CNR, Ist Studio Mat Nanostrutturati, I-90146 Palermo, Italy
来源：
JOURNAL OF POWER SOURCES | 2012年 / 199卷
关键词：
High temperature proton conductors (HTPCs); Barium cerates; Nb-doping; Structural analysis; Electrochemical performance; BACEO3-BASED PROTON CONDUCTORS; CHEMICAL-STABILITY; FUEL-CELLS; BARIUM CERATE; OXIDE; CONDUCTIVITY; NONSTOICHIOMETRY; FABRICATION; IMPEDANCE;
D O I：
10.1016/j.jpowsour.2011.10.038
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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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页码：201 / 206
页数：6
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