One-Step Thermal Processing of BaCe0.8Y0.2O3-δ Hydrogen Permeable
Multi-Channel Hollow Fiber Membrane
Abstract
Yttrium-doped barium cerate
(BaCe0.8Y0.2O3-δ, BCY)
is the most widely studied proton conducting material and is frequently
fabricated as dense membranes for hydrogen separation. However, the
difficulty to prepare dense BCY membranes is the extremely high
sintering temperature, normally higher than 1500 oC. Herein, the BCY
7-channel hollow fiber membrane was prepared by one-step thermal
processing (OSTP). It proved that adding
Co2O3 as sintering aid is beneficial to
the densification and 1wt% Co2O3 was
the optimum addition to form a homogeneous phase structure. The dense
sintering temperature was greatly reduced from over 1500 to 1350
oC. The hydrogen permeation flux of the BCY hollow
fiber membrane reached up to 0.34 ml
min-1cm-2 at 900
oC. The long-term stability test last for 300 h. The
properties of OSTP samples were demonstrated to be essentially higher
than samples made by conventional ceramic hollow fiber fabrication
methods.