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Co-extruded dual-layer hollow fiber with different electrolyte structure for a high temperature micro-tubular solid oxide fuel cell

Ahmad, S. H. and Jamil, S. M. and Othman, M. H. D. and Rahman, M. A. and Jaafar, J. and Ismail, A. F. (2017) Co-extruded dual-layer hollow fiber with different electrolyte structure for a high temperature micro-tubular solid oxide fuel cell. International Journal of Hydrogen Energy, 42 (14). pp. 9116-9124. ISSN 0360-3199

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Abstract

In this study, the phase inversion-based co-extrusion method was employed to fabricate a structural-improved electrolyte/anode dual-layer hollow fiber (HF) precursor, which was then co-sintered at 1450��C. The electrolyte structures were thoroughly investigated by varying the loading of electrolyte material (i.e. Yttria-stabilized zirconia, YSZ) with differing particle sizes (i.e. micron, sub-micron, and nano-sized) during suspension preparation. The results showed that the most promising electrolyte layer with thin, dense, gas-tight, and defect-free properties was obtained by mixing 70% submicron-YSZ and 30% nano-YSZ in electrolyte suspension (E-0.7sub0.3nano). This electrolyte formulation co-extruded with a thick nickel-oxide-YSZ (NiO-YSZ) anode layer yielded the highest bending strength of 85�MPa, providing major mechanical strength to the HF. Besides that, the nitrogen permeability value at 2.87ï¿½× 10−6�mol�m−2�s−1�Pa−1 suggested that the electrolyte was gas-tight, preventing fuel and oxidant transport. The fiber was then reduced to nickel (Ni)-cermet anode. It was developed to be a complete micro-tubular solid oxide fuel cell (MT-SOFC) by depositing the lanthanum strontium cobalt ferrite (LSCF)/YSZ cathode via brush painting on the dual-layer HF. The cell was fed with hydrogen gas and yielded an open-circuit voltage (OCV) as high as 1.06�V with maximum power density of 0.243�W�cm−2, at 875��C. Based on this test, it was found that the electrolyte structural-modified dual-layer hollow fiber-based MT-SOFC using mixed particle sizes may result in a promising OCV. However, the relatively low value for power density may be due to a less porous anode; thus, improvements in the anode's structure are required in future research.

Item Type:Article
Uncontrolled Keywords:Extrusion, Hydrogen fuel, Phase-inversion, Sintering, SOFC, YSZ electrolyte
Subjects:T Technology > TP Chemical technology
Divisions:Chemical Engineering
ID Code:77135
Deposited By: Fazli Masari
Deposited On:31 May 2018 17:36
Last Modified:31 May 2018 17:36

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