Enhanced Photocatalytic Performance of TiO2@CeO2 Hollow Structure through Synergetic Surface and Interface Engineering

In this study, a synergetic structural design is developed to improve the photocatalytic performance of the sub-micro core-shell hollow sphere (TiO2@H-CeO2). TiO2@H-CeO2 with maximum surface/interface effect is chosen as the substrate and then reacts with different concentrations of Ce(NO3)(3)& BULL;6H(2)O solutions. Optical properties analysis shows that after the reaction, the band gap of the composite structure and the electron-hole recombination efficiency both decrease while the photodegradation ability is effectively improved. Spectroscopic and microscopic observations reveal two changes in the structure after the reaction. The first is the deposition of CeO2 nanoparticles that can be observed inside and on the surface of the shell; the second is the doping of Ce3+ in the TiO2 nanoparticles of this shell. The deposition of CeO2 particles increases the interfacial area between the CeO2 and TiO2 and facilitates the corresponding charge transfer. The Ce3+ doping in the TiO2 shell changes the optical properties of TiO2. Therefore, the improved performance of the composite structure can be attributed to the synergy of different surfaces and interfacial effects caused by the reactions.