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5 Single fibre electrode measurements - a versatile strategy for assessing the non-uniform kinetics Conclusions We have presented an innovative approach to quantify the kinetics at single carbon fibre electrodes using experimental results and a simple 1D computational model. Using this method, the rate constant for the ferricyanide and ferrocyanide redox reaction was calculated at 12 different carbon fibres extracted from the same sample of carbon felt. These measurements demonstrated that there were non-uniform kinetics within the carbon felt electrode. Using the experimentally determined rate constant distribution and void size distribution of the carbon felt electrode, it is then possible to accurately simulate cyclic voltammograms at the felt electrodes over a wide range of sweep rates. Importantly, while it is possible to fit the cyclic voltammograms obtained at a single sweep rate to the model using a void size distribution and a single rate constant, it is found that the fitted rate constant varies as a function of sweep rate, highlighting the necessity of accounting for the rate constant distribution in these electrodes. This new method provides researchers with a more detailed means to quantify the performance of carbon felt electrodes, including the distribution of rate constants in a felt sample. Quantifying the kinetics and rate constant uniformity of the carbon felt electrodes will make it significantly easier to identify and design effective carbon felt modification methods for RFB applications. Acknowledgements The authors thank Dane Gerneke, University of Auckland, for assistance with the micro CT imaging. 70PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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