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7 Thermal Activation of Carbon Felt for the Positive Vanadium Redox Couple The electrolyte concentration of 1 mM VO2+ and VO2+ was selected to balance faradaic, capacitive and resistive features. For a 1 mM concentration, the faradaic response was much larger than the electric double layer charging, but higher concentrations increase the uncertainties of calculating the peak separation, due to larger electrical resistance corrections. In this work electrical resistance was measured before cyclic voltammetry using hybrid EIS scans, recorded at frequencies between 200 kHz and 0.01 Hz with a 5 mV rms perturbation. The impedance recorded at 0o phase angle was then taken as the electrical resistance for the felt and the solution. 80% of the resistance was corrected for using positive feedback correction during cyclic voltammetry, with the remaining 20% correct for post run. The effect of thermal treatment on felt physical area and mass loss was investigated using BET and thermal gravimetric analysis (TGA) respectively. BET measurements were carried out using a Gemini VII 2390, Surface Area Analyzer. TGA measurements were carried out in an air atmosphere, starting at room temperature (23 °C) and ramping up to 1000 °C at 5 °C min-1. 94PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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