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9 Conclusions and Recommendations Recommendations for Future Work The electrochemical performance of single carbon fiber electrodes and carbon felts has been accurately analysed using electrochemical impedance spectroscopy, cyclic voltammetry and polarization curve measurements for the Fe(CN) 3− / Fe(CN) 4− and VO2+ / VO2+ redox 66 couples. However, this primarily serves as a proof of concept, as the V2+ / V3+ redox reaction is considered to be the performance limiting reaction for the vanadium redox flow battery. In this work we selected the VO2+ / VO2+ redox couple to avoid large current contributions from side reactions during electrochemical measurements, simplifying the analysis. Future work should be focused on applying the analytical methods developed in this work to the V2+ / V3+ redox reaction, with attention given to improving the kinetics of the vanadium reaction, whilst inhibiting the hydrogen evolution reaction to improve coulombic efficiency. Once this is understood, full cell measurements should be recorded using the same procedures as in literature, to enable direct comparison of the performance. In current literature the importance of different functional groups is often discussed, however the identification of the most effective functional groups has likely been held back by the difficulties involved in calculating the inherent rate constant. Using the improved understanding of the inherent kinetics developed in this work, it should be possible to identify with greater confidence the contribution to battery performance from electrode wettability, surface roughness, inherent kinetics and conductivity. If this is achieved, more targeted electrode modifications can be designed, with the aim of improving the energy efficiency of the cell when operated at industrially relevant current densities. 126PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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