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Zr- and Tb-doped barium cerate-based cermet membrane for hydrogen separation application

Research paper by Quazi A. Islam, Mir W. Raja, Rajendra N. Basu

Indexed on: 25 Jan '17Published on: 24 Jan '17Published in: Journal of the American Ceramic Society



Abstract

Ba0.8Ce0.35Zr0.5Tb0.15O3-δ (BCZT) perovskite has been synthesized by glycine-assisted solution combustion method. The Ni-Ba0.8Ce0.35Zr0.5Tb0.15O3-δ-based cermet membrane is obtained by cosintering NiO and BCZT powder mixture at 1550°C in reducing atmosphere. The X-ray diffraction pattern of sintered pellet shows the characteristic peaks of both Ni and BCZT phases. FESEM image and elemental mapping confirm the presence of randomly distributed metallic nickel in the BCZT matrix. An electrical conductivity of ~14 S/cm at 700°C is achieved in Ni-BCZT membrane, which reduced further with increase in temperature (>700°C). The cermet membrane (1.5 mm thick) shows a highest hydrogen permeation flux of ~0.07 mL/min/cm2 at 900°C. Chemical stability of Ni-BCZT membrane has also been examined under humid and carbon dioxide containing atmosphere. The membrane shows good structural stability without any significant change in hydrogen permeation flux.