Effect of Annealing and Etching Times on Anatase TiO2 Hollow Sphere

The development of high-efficiency photocatalysts plays an important role in the application solar energy conversion. Titanium dioxide (TiO2) with anatase crystalline phase is well-known as semiconductor thin layers for cells. This work has constructed a novel TiO2 hollow sphere (HST) 2-step synthesis. first step coating SiO2 template to build core-shell SiO2@TiO2 (CSST). second etching via sonication elute from CSST and construct HST. annealing 1 6 hours 7 resulted HST different crystallite sizes microstrains. ~90 nm been fabricated size 9.53 20.54 microstrain 0.34 3.42. It was found that optimum obtained 2 5 best photooxidation I- under UV irradiation. times can be recommended future cell fabrication applications.