Photoreduction of CO2 on TiO 2/SrTiO 3 Heterojunction Network Film

Nanoscale Research Letters
Yongsheng BiJianjun Yang

Abstract

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 TiO2/ SrTiO3 heterojunction film by the hydrothermal method. In the process of the reaction, part of NTA reacted with SrCl2 to form SrTiO3 nanocubes, and the remainder dehydrated to transform to the rutile TiO2. The ratio of TiO2 and SrTiO3 varied with the hydrothermal reaction time. SEM and TEM images indicated that SrTiO3 nanocubes dispersed uniformly on TiO2 film, and the particle size and crystallinity of SrTiO3 nanocubes increased with the reaction time prolonging. The TiO2/SrTiO3 heterojunction obtained by 1 h showed the best activity for CO2 photoreduction, where the mole ratio of TiO2 and SrTiO3 was 4:1. And the photo-conversion efficiency of CO2 to CH4 improved remarkably after the foreign electron traps of Pt and Pd nanoparticles were loaded. The highest photocatalytic production rate of CH4 reached 20.83 ppm/h cm(2). In addition, the selectivity of photoreduction product of CO2 was also increased apparently when Pd acted as the cocatalyst on TiO2/SrTiO3 heterojunction film.

References

Jun 15, 2007·Chemical Reviews·Toshiyasu SakakuraHiroyuki Yasuda
Jul 12, 2007·Dalton Transactions : an International Journal of Inorganic Chemistry·Michele Aresta, Angela Dibenedetto
Feb 15, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Tieping CaoYichun Liu
Aug 2, 2011·Chemistry Central Journal·Rengasamy VelmuruganMeenakshisundaram Swaminathan

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Citations

Feb 15, 2019·Chemical Reviews·Xin LiXiaobo Chen

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Methods Mentioned

BETA
X-Ray

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