Lookup NU author(s): Dr Francesco Dal Grande,
Professor Ian Metcalfe
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
Two types of micro-tubular hollow fiber SOFCs (MT-HF-SOFCs) were prepared using phase inversion and sintering; electrolyte-supported, based on highly asymmetric Ce0.9Gd0.1O1.95(CGO) HFs and anode-supported based on co-extruded NiO-CGO(CGO)/CGO HFs. Electroless plating was used to deposit Ni onto the inner surfaces of the electrolyte-supported MT-HF-SOFCs to form Ni-CGO anodes. LSCF-CGO cathodes were deposited on the outer surface of both these MT-HF-SOFCs before their electrochemical performances were compared at similar operating conditions. The performance of the anode-supported MT-HF-SOFCs which delivered ca. 480mWcm(-2) at 600 degrees C was superior to the electrolyte-supported MT-HF-SOFCs which delivered ca. six times lower power. The contribution of ohmic and electrode polarization losses of both FCs was investigated using electrochemical impedance spectroscopy. The electrolyte-supported MT-HF-SOFCs had significantly higher ohmic and electrode polarization ASR values; this has been attributed to the thicker electrolyte and the difficulties associated with forming quality anodes inside the small (<1mm) lumen of the electrolyte tubes. Further development on co-extruded anode-supported MT-HF-SOFCs led to the fabrication of a thinner electrolyte layer and improved electrode microstructures which delivered a world leading 2,400mWcm(-2). The newly made cell was investigated at different H-2 flow rates and the effect of fuel utilization on current densities was analyzed.
Author(s): Droushiotis N, Dal Grande F, Othman MHD, Kanawka K, Doraswami U, Metcalfe IS, Li K, Kelsall G
Publication type: Article
Publication status: Published
Journal: Fuel Cells
Print publication date: 01/04/2014
Online publication date: 07/03/2014
Acceptance date: 26/06/2013
Date deposited: 17/11/2014
ISSN (print): 1615-6846
ISSN (electronic): 1615-6854
Publisher: Wiley - VCH Verlag GmbH & Co. KGaA
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