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Comparison Between Anode-Supported and Electrolyte-Supported Ni-CGO-LSCF Micro-tubular Solid Oxide Fuel Cells

Lookup NU author(s): Dr Francesco Dal Grande, Professor Ian Metcalfe

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).


Abstract

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.


Publication metadata

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

Year: 2014

Volume: 14

Issue: 2

Pages: 200-211

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

URL: http://dx.doi.org/10.1002/fuce.201300024

DOI: 10.1002/fuce.201300024


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