Design of BaZr0.8Y0.2O3-δ protonic conductor to improve the electrochemical performance in intermediate temperature solid oxide fuel cells (IT-SOFCs)

被引:93
作者
D'Epifanio, A. [1 ]
Fabbri, E. [1 ]
Di Bartolomeo, E. [1 ]
Licoccia, S. [1 ]
Traversa, E. [1 ]
机构
[1] Univ Roma Tor Vergata, Dept Chem Sci & Technol, I-00133 Rome, Italy
关键词
doped barium zirconate BZY; high temperature proton conductors (HTPCs); IT-SOFC; power density; protonic conductor;
D O I
10.1002/fuce.200700045
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
BaZr0.8Y0.2O3-delta, (BZY), a protonic conductor candidate as an electrolyte for intermediate temperature (500-700 degrees C) solid oxide fuel cells (IT-SOFCs), was prepared using a sol-gel technique to control stoichiometry and microstructural properties. Several synthetic parameters were investigated: the metal cation precursors were dissolved in two solvents (water and ethylene glycol), and different molar ratios of citric acid with respect to the total metal content were used. A single phase was obtained at a temperature as low as 1,100 degrees C. The powders were sintered between 1,450 and 1,600 degrees C. The phase composition of the resulting specimens was investigated using X-ray diffraction (XRD) analysis. Microstructural characterisation was performed using field emission scanning microscopy (FE-SEM). Chemical stability of the BZY oxide was evaluated upon exposure to CO2 for 3 h at 900 degrees C, and BZY showed no degradation in the testing conditions. Fuel cell polarisation curves on symmetric Pt/BZY/Pt cells of different thicknesses were measured at 500-700 degrees C. Improvements in the electrochemical performance were obtained using alternative materials for electrodes, such as NiO-BZY cermet and LSCF (La0.8Sr0.2Co0.8Fe0.2O3) and reducing the thickness of the BZY electrolyte, reaching a maximum value of power density of 7.0 mW cm(-2) at 700 degrees C.
引用
收藏
页码:69 / 76
页数:8
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