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7 Thermal Activation of Carbon Felt for the Positive Vanadium Redox Couple Experimental Three different carbon fiber samples were tested, all of which were PAN based carbon felts (GFE-1 graphite felt, Cera Materials, USA, G100 and C100, AvCarb, USA). Thermal treatment of the carbon felt samples was carried out by heating in air for 1 hour at 200 oC, 300 oC, 400 oC, 500 oC, 600 oC and 700 oC. With the mean diameter of the different felt samples calculated from scanning electron micrographs (SEM), as detailed in Chapters (4-6). The capacitance and kinetic performance of each felt was tested using cyclic voltammetry. The capacitance was recorded at 50, 100, 200, 500 and 1000 mVs-1 in solution of 0.5 M H2SO4. With the kinetic performance analysed from cyclic voltammetry recorded in a 1 mM VOSO4 (Alfa Aesar) and 0.5 mM V2O5 in 0.5 M H2SO4 electrolyte solution at 2, 5 and 10 mVs-1. All cyclic voltammograms were recorded in a custom designed and built cell, (Figure 7.1). Figure 7.1: Cell design for measuring cyclic voltammetry at thermally modified carbon felt samples. Preliminary tests in a similar cell used showed that G100 felt in particular was not easily wetted by the 1 mM VO2+ / VO2+ in 0.5 M H2SO4 electrolyte. Therefore, this cell was designed to reduce the influence of wetting differences on kinetic measurements. Improvement in repeatability and wetting in this cell was made possible through the ability to flow electrolyte through the felt sample using a syringe. When electrolyte was forced through the felt air bubbles were visibly removed, increasing the wetted area of the felt. 93PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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