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X-ray diffraction pattern of GF-P, GF@TiO2 and GF@TiO2:H electrodes are given in Figure 6.10.a. The broad peak near 2θ = 250 and 430 in the spectrum of GF-P electrode is attributed to the crystallographic planes of (002) and (004) of the originally GF electrode. By comparing the XRD patterns of all GF electrodes, it can be found that the XRD patterns originally from GF show a strong decrease in diffraction intensity after TiO2 coating. Additional diffraction peaks were appearing in the pattern of GF@TiO2 electrode at 27.40; 35.80 and 54.30; which are consistent with the rutile TiO2 (110), (101), and (211) crystalline planes, respectively. All peaks are in line with the standard pattern (JCPDS no.: 21-1276). After hydrogen treatment, the obtained GF@TiO2:H displayed the same XRD patterns, indicating that no phase transition occurred in the reduction process. a) TiO2 rutile pattern GF-P GF@TiO2 GF@TiO2:H 20 30 40 50 60 70 80 b) 80 70 60 50 40 30 20 2 GF@TiO2:H GF@TiO2 500 600 700 800 Wavelenght / nm Absorptivity / % Arbitrary Units 400 Figure 6.10. - a) X-ray diffraction spectra of GF electrode and as-prepared GF@TiO2 and GF@TiO2:H electrodes; b) UV-visible absorption spectra. 93PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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