Impedance analysis of electrodes made of continuous carbon filaments in a 20 cm2 redox flow cell

The most commonly used electrodes in redox flow batteries are carbon fiber felts, which assemblies of randomly oriented short fibers. avenues to improve cell performance usually pre-treatment enhance their catalytic activity, modifications porosity, and reducing resistivity by increasing compression. Our investigations focus on made continuous filaments, where filaments were arranged specific geometric patterns order investigate the effect density spatial distribution across direction performance. To identify source voltage losses, electrochemical evaluations performed with impedance spectroscopy (EIS), compared felt electrodes. electrochemically reversible ferri/ferrocyanide system at 50% state-of-charge (SOC) was as probe for both anolyte catholyte avoid varying electrode activities anode/cathode due differences species. findings generate design considerations reduce losses batteries.