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Analysis of current collection in micro-tubular solid oxide fuel cells: An empirical and mathematical modelling approach for minimised ohmic polarisation
Hodjati-Pugh, O Andrews, J Dhir, A Steinberger-Wilckens, R
Hodjati-Pugh, O
Andrews, J
Dhir, A
Steinberger-Wilckens, R
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2021-03-19
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Abstract
Data from electrochemical impedance spectroscopy (EIS) of a 152 mm long, 6.8 mm outer diameter (OD) segmented-in-series micro-tubular solid oxide fuel cell (μT-SOFC) coupled with equivalent circuit modelling (ECM) support a circuit model and a continuum resistance path model to investigate the ohmic polarisation and current distribution for various current collector configurations on a micro-tube. Minimising the characteristically long axial current conduction pathways of μT-SOFCs is critical to maximise cell performance, particularly of cells more than a few centimetres long. Optimal positioning of a single current collector minimises the performance losses from the electrode. Multiple current collector terminals increase cell performance over a single terminal, but positioning must still be optimised. Sizing of the current collector terminal is critical to limit the loss of active area of the cathode. A trade-off between terminal sizing/spacing and loss of active area can lead to sub-optimal current collection. The models are generalised for all possible current collector configurations. We identify simple criteria to determine the maximum current collection efficiency of single and multiple anode current collectors for a range of cell geometries. The design tool allows early consideration to cell sizing as a function of anode current collection during cell and stack development.
Citation
Hodjati-Pugh O., Andrews, J., Dhir A, Steinberger-Wilckens R. (2021) Analysis of current collection in micro-tubular solid oxide fuel cells: An empirical and mathematical modelling approach for minimised ohmic polarisation. Journal of Power Sources, 494, 229780.
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Journal article
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en
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This is an accepted manuscript of an article published by Elsevier in Journal of Power Sources, available online: https://doi.org/10.1016/j.jpowsour.2021.229780
The accepted version of the publication may differ from the final published version.
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0378-7753
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1873-2755
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This work was supported by the Centre for Doctoral Training (CDT) in Fuel Cells and their Fuels, which is part-funded by the EPSRC under contract EP/L015749/1.