Photocatalytic reduction of CO2 on Pt2+–Pt0/TiO2 nanoparticles under UV/Vis light irradiation: A combination of Pt2+ doping and Pt nanoparticles deposition. (24th August 2015)

• Record Type: Journal Article
• Authors: Xiong, Zhuo; Wang, Haibing; Xu, Nuoyan; Li, Hailong; Fang, Baizeng; Zhao, Yongchun; Zhang, Junying; Zheng, Chuguang
• Is Part Of: International journal of hydrogen energy. Volume 40:Number 32(2015)
• Page Start: 10049
• Page End: 10062
• Publication Date: 2015-08-24
• Subjects: Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.06.075
• Languages: English
• ISSNs: 0360-3199

Abstract

<abstract xml:lang="en" abstract-type="author" id="abs0010"> <title id="sectitle0010">Abstract</title> <sec> <p id="abspara0010">TiO₂ nanoparticles modified by Pt²⁺ ions and Pt nanoparticles (Pt²⁺–Pt⁰/TiO₂) were synthesized through a simple sol–gel method. The physical-chemical characteristics of the catalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscope, UV–Vis absorbance spectroscopy, and photoluminescence spectroscopy. Pt²⁺ ions were doped into the lattice of TiO₂ and Pt nanoparticles were deposited on the surface of TiO₂. Photocatalytic reduction of CO₂ with water vapor under ultraviolet (UV) and visible light irradiation was conducted in a continuous-flow reactor. Loading of Pt²⁺ and Pt⁰ with appropriate ratio effectively enhanced the yields of H₂ and CH₄ but showed no significant effect on the production of CO. The highest yield of CH₄ reached 264.5 and 138.6 μmol g-cat⁻¹ after UV and visible light irradiation for 7 h, respectively. The enhanced activity of Pt²⁺–Pt⁰/TiO₂ catalyst may be due to the low recombination rate of photogenerated electron–hole pairs caused by Pt nanoparticles and the strong visible light absorption, as well as the high surface area induced by Pt²⁺ ions.</p> </sec> </abstract>