Abstract
Improvement in catalytic activity of electrochemically treated carbon-based electrode (relative to that of the untreated carbon electrode) toward vanadium redox flow battery (VRFB) performance is widely reported in the literature [1-3]. In this work, performance characteristics of ex-situ treated carbon felt electrode is compared to the in-situ treated (charge-discharge cycles) carbon felt electrode. Also, the effect of porosity of electrode on the performance of VRFB is studied using different gasket thickness. The VRFBs constructed with the in-situ and ex-situ treated electrodes have comparable performance. Furthermore, the electrode compressed to 22 % delivers higher performance compared to that of the electrode compressed to 6 %. It is observed that porosity of electrode has a pivotal role in the cell performance. Thus, the thickness of the electrode must be considered along with the surface area (cm2) and it would be appropriate to report power density in terms of the volume of the electrode (cm3). Figure 1: Performance curves of VRFB using three different carbon felt electrodes of area 25 cm2 at a flow rate of 20 ml per minute.
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