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Combining electrochemical and imaging analyses to understand the effect of electrode microstructure and electrolyte properties on redox flow batteries

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  • Simon, Benedict A.
  • Gayon-Lombardo, Andrea
  • Pino-Muñoz, Catalina A.
  • Wood, Charles E.
  • Tenny, Kevin M.
  • Greco, Katharine V.
  • Cooper, Samuel J.
  • Forner-Cuenca, Antoni
  • Brushett, Fikile R.
  • Kucernak, Anthony R.
  • Brandon, Nigel P.

Abstract

Reducing the cost of redox flow batteries (RFBs) is critical to achieving broad commercial deployment of large-scale energy storage systems. This can be addressed in a variety of ways, such as reducing component costs or improving electrode design. The aim of this work is to better understand the relationship between electrode microstructure and performance. Four different commercially available carbon electrodes were examined – two cloths and two papers (from AvCarb® and Freudenberg Performance Materials) – and a comprehensive study of the different pore-scale and mass-transport processes is presented to elucidate their effect on the overall cell performance. Electrochemical measurements were carried out in a non-aqueous organic flow-through RFB with these different electrodes, using two supporting solvents (propylene carbonate and acetonitrile) and at a variety of flow rates. Electrode samples were scanned using X-ray computed tomography, and a customised segmentation technique was employed to extract several microstructural parameters. A pore network model was used to calculate the pressure drops and permeabilities, which were found to be within 1.26 × 10−11 and 1.65 × 10−11 m2 for the papers and between 8.61 × 10−11 and 10.6 × 10−11 m2 for the cloths. A one-dimensional model was developed and fit to polarisation measurements to obtain mass-transfer coefficients, km, which were found to be between 1.01 × 10−6 and 5.97 × 10−4 m s−1 with a subsequent discussion on Reynolds and Sherwood number correlations. This work suggests that, for these fibrous materials, permeability correlates best with electrochemical cell performance. Consequently, the carbon cloths with the highest permeability and highest mass-transfer coefficients, displayed better performances.

Suggested Citation

  • Simon, Benedict A. & Gayon-Lombardo, Andrea & Pino-Muñoz, Catalina A. & Wood, Charles E. & Tenny, Kevin M. & Greco, Katharine V. & Cooper, Samuel J. & Forner-Cuenca, Antoni & Brushett, Fikile R. & Kuc, 2022. "Combining electrochemical and imaging analyses to understand the effect of electrode microstructure and electrolyte properties on redox flow batteries," Applied Energy, Elsevier, vol. 306(PB).
  • Handle: RePEc:eee:appene:v:306:y:2022:i:pb:s0306261921010382
    DOI: 10.1016/j.apenergy.2021.117678
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    References listed on IDEAS

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    1. Messaggi, M. & Canzi, P. & Mereu, R. & Baricci, A. & Inzoli, F. & Casalegno, A. & Zago, M., 2018. "Analysis of flow field design on vanadium redox flow battery performance: Development of 3D computational fluid dynamic model and experimental validation," Applied Energy, Elsevier, vol. 228(C), pages 1057-1070.
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