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the TiO2 the HER is depleted to more negative potentials comparatively to the negative VRFBs reaction (V3+/V2+). 0.0 GF-P -0.1 -0.2 -0.3 -0.4 -0.5 0 20 40 60 80100 SOC / % GF@TiO2 0.0 -0.1 -0.2 -0.3 -0.4 0 20 40 60 80100-0.5 SOC / % V3+ + e- V2+ HER V3+ + e- V2+ HER Figure 6.1. – Effect of the presence of TiO2 over the reactions taking place in the negative compartment of the battery. 6.1.1.1 Characterization Initially, the structural shape of the titanium dioxide deposited on the carbon fibres can be morphology characterized seeing Figure 6.2. Firstly, in Figure 6.2a. the felt fibres are just thermal treated by O2 plasma. From Figure 6.2b can be observed that there are only titanium dioxide nanoparticles (NPs) to Figure 6.2d. obtaining a TiO2 multi-nanorods covering the whole surface of the graphite felt (GF). Passing by an intermediate, which titanium dioxide single-nanorods decorates the surface (Figure 6.2c) in a different structural orientation than the multi- nanorods. 84 E vs. NHE / V E vs. NHE / VPDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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