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5 Single fibre electrode measurements - a versatile strategy for assessing the non-uniform kinetics In order to use these measured rate constants to simulate cyclic voltammetry at carbon felt electrodes, the void size distribution was determined by taking 3,100 2D slices every 0.5 μm from micro-CT imaging of the carbon felt (Figure 5.3a). The predominant direction of fibers was normal to the slice direction and for each slice a void size distribution was calculated by finding the average distance between each fibre within each slice using image analysis (ImageJ). These average distances were converted to equivalent void diameters and then overall felt void size distribution was then calculated as an average of the distributions from each slice. The void size distribution was discretised by finding the fraction of voids within each 10 μm diameter increment (Figure 5.3b). This experimentally determined void size distribution is similar to those reported by others who also used micro-CT imaging on carbon felt electrodes, although the felt type and analysis method differed [178, 189]. Figure 5.3: a) CT image of carbon felt; b) void diameter distribution: felt area is defined as the fractional area of fibres within the felt within a given void diameter range; c) representation of how the void diameters were calculated from the micro-CT slices 62PDF Image | Electron Transfer Kinetics in Redox Flow Batteries
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