Electron Transfer Kinetics in Redox Flow Batteries

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Electron Transfer Kinetics in Redox Flow Batteries ( electron-transfer-kinetics-redox-flow-batteries )

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4 EIS at carbon fiber cylindrical microelectrodes Conclusions The Bessel function form for the impedance of the cylindrical diffusion problem was experimentally verified for the first time by nonlinear least-squares fitting to impedance data measured for the Fe(CN)3−/4− redox system at carbon fiber electrodes. Accurate results were 6 facilitated by fitting directly to an approximation of the theoretical expression for the impedance. By making the combined parameter 𝑘/√𝐷 one of the fit parameters, the need for error propagation was minimized and the rate constant could be accurately found. Provided the mean diffusivity is known, this method does not require measurements of the electrode length, radius or area. Acknowledgements Financial support is acknowledged from the Natural Sciences and Engineering Council of Canada (Discovery Grant RGPIN-2017-04045) and the University of Canterbury (PhD scholarship for L. Landon-Lane). 49

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