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Carbon felt electrodes for redox flow battery: Impact of compression on transport properties

Banerjee, Rupak; Bevilacqua, Nico; Mohseninia, Arezou; Wiedemann, Benjamin; Wilhelm, Florian; Scholta, Joachim; Zeis, Roswitha

In a flow battery setup, carbon felt materials are compressed to obtain higher performance from the battery. In this work, a commercially available carbon felt material, commonly used as electrodes in Vanadium Redox Flow Battery setups was evaluated for the transport properties (diffusivity, permeability, pressure drop required for maintaining flow, among others) while under seven set levels of compression, using an image analysis coupled with pore network modeling approach. X-ray computed tomography has been used to obtain the microstructure of a commercially available electrode under compressed conditions. An open-source pore network modeling tool, OpenPNM has been used to investigate the transport properties of the porous felt material at each of the set compression levels. The results from the modeling are compared against experimentally obtained electrolyte transport patterns visualized using synchrotron X-ray radiography. The electrical resistance of the carbon felt electrode was measured experimentally using a four-probe method. The compression resulted in a 58% reduction in permeability, and a 25% reduction in single-phase diffusion. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000099205
Veröffentlicht am 22.10.2019
DOI: 10.1016/j.est.2019.100997
Zitationen: 22
Zitationen: 24
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Institut für Physikalische Chemie (IPC)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2019
Sprache Englisch
Identifikator ISSN: 2352-152X
KITopen-ID: 1000099205
HGF-Programm 37.02.03 (POF III, LK 01) System Solutions with Hydrogen
Erschienen in Journal of energy storage
Verlag Elsevier
Band 26
Seiten Article: 100997
Schlagwörter Redox flow batteries; Carbon felt electrodes; Pore network modeling; Transport properties; Compression; Electrical conductivity; Synchrotron X-ray radiography
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