Tape-casting and freeze-drying gadolinia-doped ceria composite membranes for carbon dioxide permeation

Abstract

Porous ceria: 20 mol% gadolinia (20GDC) ceramic membranes were prepared by tape casting (TC) and freeze-drying (FD) techniques, obtaining ceramic matrices with randomly dispersed round pores and with an aligned pore structure, respectively. Samples were sintered at 1450 °C, followed by infiltration of molten eutectic sodium-lithium carbonates (NLC). The pore morphology of 20GDC-TC and 20GDC-FD composite membranes was evaluated by analysis of scanning electron microscopy images. The electrical resistivity was determined by electrochemical impedance spectroscopy in the 1 Hz - 10 MHz frequency range from 300 °C to 700 °C, covering the solid-to-molten NLC temperature range, showing that the aligned pore structure improved the conductivity of the ceramic matrix in addition to facilitating molten carbonate infiltration, improving the total (bulk + interfaces) electrical conductivity of the composite membrane. Permeation experiments showed high CO 2 permeation rates reached 5.35 × 10 −7 mol m −2 s −1 Pa −1 at 800 °C. The infiltration of molten sodium-lithium carbonate in gadolinium-doped ceria prepared by the freeze-drying technique is proposed as an optimized procedure for producing membranes for carbon dioxide separation. - Ceramic-carbonate dual-phase membranes were successfully prepared by tape casting and freeze-drying techniques. - Ceramic matrices were produced with aligned porosity for optimizing carbon dioxide permeation. - Electrochemical impedance spectroscopy measurements indicated improved carbonate and oxygen ion conductivity in the membranes with porous matrices obtained by freeze drying. - CO 2 permeance for the membrane produced by freeze-drying reached 5.35 × 10 −7 mol m −2 s −1 Pa −1 at 800 °C