Cathode/electrolyte systems for solid oxide fuel cells fabricated using flame assisted vapour deposition technique

摘要

Flame assisted vapour deposition (FAVD) has been developed as a simple and cost-effective method in manufacturing solid oxide fuel cell (SOFC) components in an open atmosphere within a single operation. An appropriate interlayer between the cathode/electrolyte system has been demonstrated to improve the conductivities in planar SOFCs. Cathode/electrolyte systems with different interlayers, such as La_(0.82)Sr_(0.18)MnO_3/(Y_2 O_3)_(0.15)(CeO_2)_(0.85)/YS Z, La_(0.8)Sr_(0.2)CoO_3/(Y_2O< sub>3)_(0.15)(CeO_2)_(0.85)/YSZ, and La_(0.8)Sr_(0.2)CoO_3/Ce_(0.8) Gd_(0.2)O_(1.9)/YSZ have been investigated and compared with La_(0.82)Sr_(0.18)MnO_3/YSZ, La_(0.8)Sr_(0.2)CoO_3/Ce_(0.8) Gd_(0.2)O_(1.9), and La_(0.8)Sr_(0.2)CoO_3/YSZ, where YSZ is 8 mol.% Y_2O_3 in ZrO_2. The structure and properties of the cathodes have been studied using SEM, XRD, DC four-point (Van der Pauw), and AC impedance spectroscopy. The results from these new systems indicate a superior performance in overall conductivity than the conventional La_(0.82)Sr_(0.18)MnO_3/YSZ system.