TiO 2 /WO 3 /Au/MWCNT composite materials for photocatalytic hydrogen production: Advantages and draw‐backs

TiO 2 /WO 3 /Au/MWCNT composite materials were obtained using different commercial titanias (Aldrich Anatase, Aldrich Rutile, and Evonik Aeroxide P25) and Aldrich WO 3 . The gold nanoparticles were deposited on the semiconductor oxides' surface by chemical reduction using sodium borohydride, and the MWCNT's were combined with the composite (in different concentrations 0.1–10 wt%) by applying an ultrasonication method. The obtained nanocomposites were successfully characterized by means of X‐ray diffraction, transmission electron microscopy, etc. The aim of the present work was to find the optimal composition (i.e. carbon nanotube content) of the composite for photocatalytic hydrogen production using oxalic acid as a sacrificial agent.