Synthesis of Cr-doped SrTiO3 photocatalyst and its application in visible-light-driven transformation of CO2 into CH4. (December 2015)

• Record Type: Journal Article
• Authors: Bi, Yiqing; Ehsan, Muhammad Fahad; Huang, Yan; Jin, Jiarui; He, Tao
• Is Part Of: Journal of CO₂ utilization. Volume 12(2015)
• Page Start: 43
• Page End: 48
• Publication Date: 2015-12
• Subjects: SrTiO3 -- Cr doping -- Photoreduction -- CO2 -- Photostability; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2015.10.004
• Languages: English
• ISSNs: 2212-9820

Abstract

Graphical abstract: Cr-doped SrTiO3 synthesized by ultrasonic chemical route can photoreduce CO2 into CH4 under visible-light irradiation with a yield of 8.8 μmol g −1 . Highlights: Cr-doped SrTiO3 is successfully synthesized by a facile ultrasonic chemical route. Cr-doped SrTiO3 exhibits a large specific surface area and visible-light response. CO2 is photoreduced into CH4 over Cr-doped SrTiO3 under visible-light irradiation. Cr-doped SrTiO3 shows good stability against photoirradiation. Abstract: Visible-light-driven Cr-doped SrTiO3 was synthesized through ultrasonic chemical method. Its specific surface area is 54.3 m 2 g –1 due to the relatively small particle size. X-ray diffraction pattern and X-ray photoelectron spectra confirmed the crystal structure and Sr substitution. UV–vis absorption spectra indicated that the Cr doping can lead to visible-light absorption. In addition, the oxygen vacancy in Cr-doped SrTiO3 also showed visible-light absorption. The obtained Cr-doped SrTiO3 was used to photocatalytically reduce CO2 into CH4 with a yield of 8.8 μmol g –1 after 10-h reaction. Moreover, the Cr-doped SrTiO3 exhibited good photostability.