Abstract
The fabrication of proton-conducting solid oxide fuel cells (PC-SOFCs) has been challenging mainly due to the poor sinterability of common proton-conducting electrolyte materials. Extremely high sintering temperatures (up to 1600 °C) and long sintering times (>10 h) are typical for obtaining dense, gas-tight proton-conducting electrolytes. Apart from the high energy cost and long production cycle time, the high sintering temperature leads to several other issues, including chemical stability of the electrolyte and its compatibility with the electrodes. In the present work, we focused on optimizing the co-sintering temperature of tubular PC-SOFCs using a freeze-cast anode support. The densification of the BaZr0.3Ce0.5Y0.2O3 (BZCY) electrolyte was greatly facilitated by the sintering shrinkage of the NiO-BZCY anode support, which was as high as 35%. Preliminary electrochemical testing of the fabricated cells was also conducted.
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