Brown, LD;
Neville, TP;
Jervis, R;
Mason, TJ;
Shearing, PR;
Brett, DJL;
(2016)
The effect of felt compression on the performance and pressure drop of all-vanadium redox flow batteries.
Journal of Energy Storage
, 8
pp. 91-98.
10.1016/j.est.2016.10.003.
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Brett_R1_The%20effect%20of%20felt%20compression%20on%20the%20performance%20and%20pressure%20drop%20of%20all-vanadium%20redox%20flow%20batteries%20RJ_LDB.pdf - Accepted Version Download (1MB) | Preview |
Abstract
The compression of carbon felt electrodes for redox flow batteries leads to changes in the electrochemical performance and has a large effect on the pressure drop of electrolyte flow through the system. In this investigation, the authors have characterised the electrochemical performance of all-vanadium redox flow batteries by studying the effect of compression on the contact resistance, polarisation behaviour and efficiency. Contact resistance was seen to reduce from ca. 2.0 Ω cm2 to 1.2 Ω cm2 and an energy efficiency of 85% was obtained from a felt compressed to 75%. Moreover, X-ray computed tomography (CT) has been employed to study the microstructure of felt electrodes at compressions up to 70%, showing a linear decrease in porosity and a constant fibre surface area-to-volume ratio. The pressure drop was modelled using computational fluid dynamics and employing the 3D structure of the felts obtained from CT, revealing that a 60% increase in compression related to a 44.5% increase in pressure drop.
| Type: | Article |
|---|---|
| Title: | The effect of felt compression on the performance and pressure drop of all-vanadium redox flow batteries |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.est.2016.10.003 |
| Publisher version: | http://dx.doi.org/10.1016/j.est.2016.10.003 |
| Language: | English |
| Additional information: | © 2017. This manuscript version is published under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International licence (CC BY-NC-ND 4.0). This licence allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licences are available at http://creativecommons.org/licenses/by/4.0. Access may be initially restricted by the publisher. |
| Keywords: | Energy storage; X-ray computed tomography; Flow; Contact resistance; Compression |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1545053 |
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