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6. Using Individual Carbon Fiber Electrodes to Quantify Effects of Thermal Activation Abstract The capacitance and standard heterogeneous rate constant for the Fe(CN) 3− / Fe(CN) 4− 66 redox couple was measured on four different carbon fiber materials, before and after thermal activation. Thermal activation was carried out in air for 60 minutes at 450 oC, with up a 38 x increase in capacitance. This showed that the electrochemical active surface increases upon thermal treatment. The apparent rate constant was measured by cyclic voltammetry and electrochemical impedance spectroscopy. It was found that for the largest rate constants, accurate and precise measurements require the use of electrochemical impedance spectroscopy. The apparent rate constant increased after thermal activation for all fibers, by up to a factor of 20,000. For this redox couple the rate constant depends on the surface functionality as well as the electrochemically active surface area, as the increase in the apparent rate constant was much larger than the increase in capacitance. 71PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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