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solution. The concentration of the precursor (titanium terc-butoxide) into the reactor for the synthesis is increased, adding 1, 2 and 5 mL. It is observed a structural variation for the electrodes, labelled as GF-TiO2 (NPs), GF-TiO2 (SNRs) and GF-TiO2 (MNRs) for 1, 2 and 5 mL used as precursor respectively. Thereafter, rutile TiO2 nanorods have been directly grown over a plasma treated (GF-HT) commercial graphite felt (GF, 4 cm2 and 5 mm thickness from Mersen S.A., Spain) using a hydrothermal process. The titanium precursor, 5 ml of titanium butoxide, is added into a 60 ml of 1:1 (v:v) (HCl:H2O) solution. The obtained mixed precursor solutions and GFs were placed in a Teflon-sealed autoclave (100 ml, Parr Instrument Co.) and heated up at 100oC. After the synthesis, a white solid precipitate was observed over the surface of GF. The as-prepared samples are cleaned by immersion in water and dried in a vacuum oven at 60oC overnight (Figure 3.2 i)). Figure 3.2. - Scheme of electrode synthesis processes over graphite felt (GF) i) Hydrothermal synthesis in 0.23M titanium terc-butoxide in HCl (1:1) in water at 100oC for 14h. ii) Thermal treatment of GF@TiO2 electrode initially in oxygen atmosphere and afterwards in Ar (5%H2) at 500oC for 4 hours each step. ii’) Thermal treatment of GF@TiO2 45PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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