Influence of the Structure of Hydrothermal-Synthesized TiO 2 Nanowires Formed by Annealing on the Photocatalytic Reduction of CO 2 in H 2 O Vapor.

The present study investigates the photocatalytic properties of hydrothermally synthesized TiO 2 nanowires (NWs) for CO 2 reduction in H 2 O vapor. It has been demonstrated that TiO 2 NWs, thermally treated at 500-700 °C, demonstrate an almost tenfold higher yield of products compared to the known commercial powder TiO 2 P25. It has been found that the best material is a combination of anatase, TiO 2 -B and rutile. The product yield increases with increasing heat treatment temperature of TiO 2 NWs. This is associated with an increase in the degree of crystallinity of the material. It is shown that the best product yield of the CO 2 reduction in H 2 O vapor is achieved when the TiO 2 NW photocatalyst is heated to 100 °C.