Redox Flow Batteries Vanadium to Earth Quinones

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Redox Flow Batteries Vanadium to Earth Quinones ( redox-flow-batteries-vanadium-earth-quinones )

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6.1.4.1 Characterization GF-HT 1μm a) 200 nm b) GF@TiO2:H 100 nm 200 nm 1μm d) GF@CeO2-x 1 μm GF@CeO2 c) Figure 6.38. – FE-SEM images of the a) core graphite GF-HT; b) morphology details of the coating layer of the GF@TiO2 electrode; c) coating layer of the GF@CeO2 electrode; d) coating layer of the GF@CeO2-x electrode. As it can be seen, Figure 6.38 exhibits the field emission scanning electron microscopy (FE-SEM) images of the TiO2 and CeO2 based GFs. Typically the GF shows a smooth morphology but a slightly porous surface. A nanorods crystal structure has been observed in GF@TiO2:H (Figure 6.38b). Figure 6.38c and d show that GF has been covered by a homogeneous ALD deposit of CeO2 maintaining the original GF surface morphology and increasing the roughness in case of the reduced one compared to the non-reduced. It also can be seen on the Figure 6.39 the completely coverage on the GF by CeO2 using the ALD technique. 133

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