Abstract
The purpose of this study was to fabricate a porous and high mechanical strength cathode support for solid oxide direct carbon fuel cells. Therefore, the effect of Gd0.1Ce0.9O2-δ (GDC) addition on the phase stability, sintering behavior, thermal expansion, porosity, electrical conductivity, and mechanical strength of La0.65Sr0.3MnO3-δ/(Y2O3)0.08(ZrO2)0.92 (LSM/YSZ) composite was evaluated. The sintering temperature and the porosity of LSM/YSZ composite were observed to increase with an increase in the amount of GDC, on the contrary, the electrical conductivity and the mechanical strength was decreased. An LSM/YSZ/GDC tri-composite with optimized properties was selected to fabricate the tubular cathode-supported SOFCs (LSM/YSZ/GDC|YSZ|NiO/YSZ) through extrusion and co-firing. A special chamber was designed for the DCFC operation of the tubular cell. Electrochemical characterization was done by measuring the polarization curves and electrochemical impedance spectroscopy using dry hydrogen or the syngas produced by in situ steam gasification of carbon black.
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