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Figure 10: (a) SEM image of TiO2 nanobelts synthesized via a hydrothermal process [70], (b) SEM image of NiO/TiO2 heterojunctions [64], (c) SEM image of the Cu2O/TiO2 heterojunctions [71], and (d) TEM image of the synthesized CeO2/TiO2 nanobelt heterojunction [72].