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Dual-layer hollow fiber MT-SOFC using lithium doped CGO electrolyte fabricated via phase-inversion technique

Jamil, S. M. and Othman, M. H. D. and Rahman, M. A. and Jaafar, J. and Mohamed, M. A. and Yusop, M. Z. M. and Ismail, A. F. and Tanemura, M. (2017) Dual-layer hollow fiber MT-SOFC using lithium doped CGO electrolyte fabricated via phase-inversion technique. Solid State Ionics, 304 . pp. 113-125. ISSN 0167-2738

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Abstract

Anode-supported micro-tubular solid oxide fuel cell (MT-SOFC) made from lithium (Li) doped cerium gadolinium oxide (CGO) electrolyte was prepared via phase inversion based co-extrusion/co-sintering technique. In this study, the co-sintering temperature of CGO electrolyte with anode layer was reduced by adding Li that acts as sintering additive. The prepared Li doped CGO (Li-CGO) were characterized by shrinkage analysis, atomic resolution analytical microscope (ARM) observation and X-ray photoelectron spectroscopy (XPS) spectra. Meanwhile, the developed half-cell of MT-SOFC which was co-sintered at 1350–1500°C with interval of 50°C were characterized by its mechanical strength, gas tightness and microstructural analysis. The electrochemical performances of the cells were tested in anode-supported MT-SOFCs with configuration of Ni-CGO anode, Li-CGO electrolyte and LSCF-CGO cathode using humidified hydrogen as fuel and oxygen air as oxidant. MT-SOFCs fabricated with Li-CGO electrolyte were found to exhibit maximum power density of 60Wm−2 at 500°C compared to 200Wm−2 for cells with unmodified CGO electrolyte. The poor performance of cell with Li-CGO electrolyte is probably due to the combined effects of (i) moderately dense electrolyte layer and (ii) appearance of electronic conductivity in Li-CGO electrolyte. Nevertheless, lowering the sintering temperature has shown good properties of the electrolyte materials, which allows the electrolyte materials and anode can be co-sintered together at lower temperature.

Item Type:Article
Uncontrolled Keywords:Additive, CGO, Lithium oxide, MT-SOFC, Sintering
Subjects:T Technology > TP Chemical technology
Divisions:Chemical Engineering
ID Code:75650
Deposited By: Widya Wahid
Deposited On:27 Apr 2018 09:39
Last Modified:27 Apr 2018 09:39

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