Photocatalytic CO2 reduction to methanol over bismuth promoted BaTiO3 perovskite nanoparticle catalysts. (August 2022)

• Record Type: Journal Article
• Authors: Dasireddy, Venkata D.B.C.; Likozar, Blaž
• Is Part Of: Renewable energy. Volume 195(2022)
• Page Start: 885
• Page End: 895
• Publication Date: 2022-08
• Subjects: Photo-catalysis -- CO2 reduction -- Methanol -- Perovskite -- Nanoparticle -- Liquid solar fuel; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2022.06.064
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: The photocatalytic reduction reactions of CO2 to methanol over bismuth-promoted BaTiO3 chemical photo-catalyst were reported for the first measurement time. Catalysts were prepared via single step deposition precipitation/solution combustion technique. Phases/morphology were characterised by powder X-ray diffraction (XRD)/scanning electron microscopy (SEM). Light absorption spectrum/bandgap energy ( E g ) was calculated using ultraviolet–visible (UV–Vis) wavelength diffuse reflectance spectroscopy. The addition of Ba/Bi increased E g . Comparing materials, synthesised by combusting, the latter showed a surface high basicity/water adsorption. Tests indicated the formation of alcohols. Bi-containing also demonstrated CO. No CH3 OH was found for precipitated though. Activity resulted from the synergetic relationship effect between Bi/Ti, caused by the charge transfer mechanism between these component species, strong interaction phenomena and recombination. All were stable for a long temporal period. In the presence of the Ba or Bi metals over titania, the electrons (e – ) from TiO2 form an e – –hole pair separation, prolonging their decay lifetime. Ba/Bi-based TiO2 presented produced a CH3 OH yield of 5.95 μmol gcat −1 h −1, higher compared to structured catalytic systems, described in specific literature reports. As opposed to hydrogen, CH3 OH is a renewable storable liquid solar fuel, not only integrating carbon capture and utilisation (CCU), but also power-to-liquid. Graphical abstract: Image 1 Highlights: Bi and Ba based titania catalyst for the photocatalytic reduction of CO2 to methanol. The synthesised BiO/BaTiO3 catalyst showed the effective electron-hole pair separation at the composite interfaces. All the catalysts showed a stable activity for more than 5 h. A high methanol yield of 5.95 μ mol gcat −1 h −1 was found over BiO/BaTiO3 catalyst.