Photocatalytic Reduction of CO₂to Methane on Pt/TiO₂Nanosheet Porous Film

Abstract

Anatase TiO2nanosheet porous films were prepared by calcination of the orthorhombic titanic acid films at 400°C. They showed an excellent photocatalytic activity for CO2photoreduction to methane, which should be related to their special porous structure and large Brunauer-Emmett-Teller (BET) surface area. In order to further improve the photocatalytic activity, Pt nanoparticles were loaded uniformly with the average size of 3-4 nm on TiO2porous films by the photoreduction method. It was found that the loading of Pt expanded the light absorption ability of the porous film and improved the transformation efficiency of CO2to methane. The conversion yield of CO2to methane on Pt/TiO2film reached 20.51 ppm/h·cm2. The Pt/TiO2nanosheet porous film was characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), and ultraviolet-visible light diffuse reflectance spectra (UV-vis DRS). Moreover, the transient photocurrent-time curves showed that the Pt/TiO2nanosheet porous film exhibited higher photocurrent, indicating that the higher separation efficiency of the photogenerated charge carriers was achieved.

Comparative study of alcohols as sacrificial agents in H2 production by heterogeneous photocatalysis using Pt/TiO2 catalysts

“…The formation of methane plays a negative role in the production of hydrogen as the mechanism by which it could form, reduction of methanol or reduction of CO 2 , consume H + and photogenerated electrons [52,53]. The patterns of methane concentration (not shown) show a rising tendency over the 3.5 hours duration of the test, with maximum methane concentrations of around 0.65-1.94 µmol⋅h -1 .…”

Fabrication of Gold/Titania Photocatalyst for CO2 Reduction Based on Pyrolytic Conversion of the Metal–Organic Framework NH2-MIL-125(Ti) Loaded with Gold Nanoparticles

“…Many reports have shown that CO 2 can be reduced by water vapor or solvent in the presence of photocatalysts. − For the vast majority of systems studied so far, irradiation of the photocatalyst with UV light was necessary. However, TiO 2 -based materials often exhibit very low efficiencies for CO 2 reduction. , One of the key reasons is the inefficient CO 2 adsorption on TiO 2 surfaces. , Modification of TiO 2 through surface decoration with noble metal nanostructures is increasingly being considered to maximize its photocatalytic efficiency. − Noble metal co-catalyst species favor electron–hole separation and induce interfacial electron transfer or allow visible light absorption by their plasmon. Recently, the potential of gold nanoparticles (GNPs) in photocatalysis has received considerable attention.…”