TiO2/WO3 Composite Photocatalysts Synergistically Enhanced by Oxygen Vacancies and Heterojunction
Titanium dioxide(TiO2)has been widely studied in the field of photocatalysis due to its excellent photocatalytic activity.However,the high recombination rate of photogenerated carriers and wide bandgap of TiO2 limit its application.In this work,TiO2/WO3 heterostructured nanocomposite photocatalysts with oxygen vacancy defects were synthesized by introducing tungsten(W)into TiO2.The introduction of oxygen vacancies reduced the band gap and broadened the light absorption range,while the heterojunction increased the photogenerated carriers and facilitated their separation.The experiment shows that TiO2/WO3 nanocomposite photocatalysts have enhanced photocatalytic activity,with up to 63.7 µmol of hydrogen produced from 100 mg of sample in 2 h.In addition,the TiO2/WO3 nanocomposite material shows excellent stability under simulated sunlight.This exploration provides new ideas for the design and preparation of TiO2-based composite photocatalysts.
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