Less can be more: Insights on the role of electrode microstructure in redox flow batteries from 2D direct numerical simulations
Fuente:
arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2022
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| _version_ | 1866909226425647104 |
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| author | Dussi, Simone Rycroft, Chris H. |
| author_facet | Dussi, Simone Rycroft, Chris H. |
| contents | Understanding how to structure a porous electrode to facilitate fluid, mass, and charge transport is key to enhance the performance of electrochemical devices such as fuel cells, electrolyzers, and redox flow batteries (RFBs). Using a parallel computational framework, direct numerical simulations are carried out on idealized porous electrode microstructures for RFBs. Strategies to improve electrode design starting from a regular lattice are explored. We observe that by introducing vacancies in the ordered arrangement, it is possible to achieve higher voltage efficiency at a given current density, thanks to improved mixing of reactive species, despite reducing the total reactive surface. Careful engineering of the location of vacancies, resulting in a density gradient, outperforms disordered configurations. Our simulation framework is a new tool to explore transport phenomena in RFBs and our findings suggest new ways to design performant electrodes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2201_00423 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Less can be more: Insights on the role of electrode microstructure in redox flow batteries from 2D direct numerical simulations Dussi, Simone Rycroft, Chris H. Fluid Dynamics Numerical Analysis Understanding how to structure a porous electrode to facilitate fluid, mass, and charge transport is key to enhance the performance of electrochemical devices such as fuel cells, electrolyzers, and redox flow batteries (RFBs). Using a parallel computational framework, direct numerical simulations are carried out on idealized porous electrode microstructures for RFBs. Strategies to improve electrode design starting from a regular lattice are explored. We observe that by introducing vacancies in the ordered arrangement, it is possible to achieve higher voltage efficiency at a given current density, thanks to improved mixing of reactive species, despite reducing the total reactive surface. Careful engineering of the location of vacancies, resulting in a density gradient, outperforms disordered configurations. Our simulation framework is a new tool to explore transport phenomena in RFBs and our findings suggest new ways to design performant electrodes. |
| title | Less can be more: Insights on the role of electrode microstructure in redox flow batteries from 2D direct numerical simulations |
| topic | Fluid Dynamics Numerical Analysis |
| url | https://arxiv.org/abs/2201.00423 |