TY - JOUR
T1 - Structural analysis, phase stability and electrochemical characterization of Nb doped BaCe0.9Y0.1O3−x electrolyte for IT-SOFCs
AU - Martorana, Antonino
AU - Giannici, Francesco
AU - Pugnalini, Chiara
AU - D'Epifanio, Alessandra
AU - Di Bartolomeo, Elisabetta
AU - D'Epifanio, Alessandra
AU - Di Bartolomeo, Elisabetta
AU - Licoccia, Silvia
AU - Longo, Alessandro
PY - 2012
Y1 - 2012
N2 - 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 °C. Sintering at 1450 °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 °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 °C temperature range.
AB - 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 °C. Sintering at 1450 °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 °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 °C temperature range.
KW - Barium cerates
KW - Electrochemical performance
KW - High temperature proton conductors (HTPCs)
KW - Nb-doping
KW - Structural analysis
KW - Barium cerates
KW - Electrochemical performance
KW - High temperature proton conductors (HTPCs)
KW - Nb-doping
KW - Structural analysis
UR - http://hdl.handle.net/10447/86303
UR - http://www.sciencedirect.com/science/article/pii/S0378775311020301
M3 - Article
VL - 199
SP - 201
EP - 206
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -