Protonic Conducting Ceramic Hollow Fiber Based on BaCe0.95Tb0.05O3-d perovskite Membrane for Hydrogen Permeation and MT-SOFC

Abstract

BaCe0.95Tb0.05O3-d (BCTb) thin membranes with perovskite structure were prepared on porous Ni-BCTb hollow fiber by a combined phase inversion with dip-coating technique. After co-sintering at 1500°C, the dense BCTb with a thickness of 15μm is gas-tight, and the N2 permeance of the reduced dual-layer hollow fiber is 3×10− 7 mol·m− 2·s− 1·Pa− 1 at 5 atm. Microtubular solid oxide fuel cell (MT-SOFC) with the configuration of Ag/BCTb/Ni-BCTb possesses high performance. The OCV is reduced with the operation temperature increase from 500 to 800°C,and the variation is significant at 700°C. Meanwhile, the maximum power density is up to 552 mW cm-2 at 700°C, higher than the value at other operation temperature increase. These imply that the serious electron leakage occurs above 700°C, and thus the Hydrogen permeation was carried out. The hydrogen permeation flux is as high as 0.61mLmin-1 cm-2at 850°C.