Photoreduction of CO(2) on TiO(2)/SrTiO(3) Heterojunction Network Film

Nanotube titanic acid (NTA) network film has a porous structure and large BET surface area, which lead them to possessing high utilization of the incident light and strong adsorption ability. We used NTA as the precursor to fabricate a TiO(2)/ SrTiO(3) heterojunction film by the hydrothermal method. In the process of the reaction, part of NTA reacted with SrCl(2) to form SrTiO(3) nanocubes, and the remainder dehydrated to transform to the rutile TiO(2). The ratio of TiO(2) and SrTiO(3) varied with the hydrothermal reaction time. SEM and TEM images indicated that SrTiO(3) nanocubes dispersed uniformly on TiO(2) film, and the particle size and crystallinity of SrTiO(3) nanocubes increased with the reaction time prolonging. The TiO(2)/SrTiO(3) heterojunction obtained by 1 h showed the best activity for CO(2) photoreduction, where the mole ratio of TiO(2) and SrTiO(3) was 4:1. And the photo-conversion efficiency of CO(2) to CH(4) improved remarkably after the foreign electron traps of Pt and Pd nanoparticles were loaded. The highest photocatalytic production rate of CH(4) reached 20.83 ppm/h cm(2). In addition, the selectivity of photoreduction product of CO(2) was also increased apparently when Pd acted as the cocatalyst on TiO(2)/SrTiO(3) heterojunction film.