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Evaluation of a non-aqueous vanadium redox flow battery using a deep eutectic solvent and graphene-modified carbon electrodes via electrophoretic deposition
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Chakrabarti, Barun, Rubio-Garcia, Javier, Kalamaras, Evangelos, Yufit, Vladimir, Tariq, Farid, Low, C. T. J., Kucernak, Anthony and Brandon, Nigel (2020) Evaluation of a non-aqueous vanadium redox flow battery using a deep eutectic solvent and graphene-modified carbon electrodes via electrophoretic deposition. Batteries, 6 (3). 38. doi:10.3390/batteries6030038
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WRAP-evaluation-non-aqueous-vanadiu-redox-flow-battery-using-deep-eutectic-solvent-graphene-modified-carbon-electrodes-via-electrophoretic-deposition-Low-2020).pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (3795Kb) | Preview |
Official URL: http://dx.doi.org/10.3390/batteries6030038
Abstract
Common issues aqueous-based vanadium redox flow batteries (VRFBs) face include low cell voltage due to water electrolysis side reactions and highly corrosive and environmentally unfriendly electrolytes (3 to 5 M sulfuric acid). Therefore, this investigation looks into the comparison of a highly conductive ionic liquid with a well-studied deep eutectic solvent (DES) as electrolytes for non-aqueous VRFBs. The latter solvent gives 50% higher efficiency and capacity utilization than the former. These figures of merit increase by 10% when nitrogen-doped graphene (N-G)-modified carbon papers, via a one-step binder-free electrophoretic deposition process, are used as electrodes. X-ray computed tomography confirms the enhancement of electrochemical surface area of the carbon electrodes due to N-G while electrochemical impedance spectra show the effect of its higher conductivity on improving RFB performance. Finally, potential strategies for the scaling-up of DES-based VRFBs using a simple economical model are also briefly discussed. From this study, it is deduced that more investigations on applying DESs as non-aqueous electrolytes to replace the commonly used acetonitrile may be a positive step forward because DESs are not only cheaper but also safer to handle, far less toxic, non-flammable, and less volatile than acetonitrile.
| Item Type: | Journal Article | |||||||||||||||||||||
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| Subjects: | T Technology > TJ Mechanical engineering and machinery T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | |||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Energy storage, Flow batteries | |||||||||||||||||||||
| Journal or Publication Title: | Batteries | |||||||||||||||||||||
| Publisher: | M D P I AG | |||||||||||||||||||||
| ISSN: | 2313-0105 | |||||||||||||||||||||
| Official Date: | 13 July 2020 | |||||||||||||||||||||
| Dates: |
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| Date of first compliant deposit: | 7 October 2020 | |||||||||||||||||||||
| Volume: | 6 | |||||||||||||||||||||
| Number: | 3 | |||||||||||||||||||||
| Article Number: | 38 | |||||||||||||||||||||
| DOI: | 10.3390/batteries6030038 | |||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||
| Publication Status: | Published | |||||||||||||||||||||
| Access rights to Published version: | Open Access | |||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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