Noble metal modified reduced graphene oxide/TiO2 ternary nanostructures for efficient visible-light-driven photoreduction of carbon dioxide into methane

Effect of Fe Loading Condition and Reductants on CO2 Reduction Performance with Fe/TiO2 Photocatalyst

“…The CO production performance of Fe/TiO 2 prepared by this study is approximately 100 times as large as that reported in reference [42]. Since Fe doping provides the free electron preventing recombination of electron and hole produced as well as improving the light absorption effect, the big improvement of CO 2 reduction performance is obtained in the present study, which reaches almost the same level compared to the other studies [7,8,[11][12][13][14][15], in terms of CO 2 reduction performance. One way to further promote the CO 2 reduction performance is double overlapping arrangement of Fe/TiO 2 coated on netlike glass disc.…”

“…Recently, studies on CO 2 photochemical reduction by TiO 2 have been carried out from the viewpoint of performance promotion by extending absorption range towards visible region [11][12][13][14][15]. Noble metal doping such as Pt, Pd, Au, and Ag [11], nanocomposite CdS/TiO 2 combining two different band gap photocatalysts [12], N 2 -modified TiO 2 [13], light harvesting complex of green plants assisted Rh-doped TiO 2 [14], and dye-sensitized TiO 2 [15] have been attempted to overcome the shortcomings of pure TiO 2 .…”

“…Noble metal doping such as Pt, Pd, Au, and Ag [11], nanocomposite CdS/TiO 2 combining two different band gap photocatalysts [12], N 2 -modified TiO 2 [13], light harvesting complex of green plants assisted Rh-doped TiO 2 [14], and dye-sensitized TiO 2 [15] have been attempted to overcome the shortcomings of pure TiO 2 . They did improve the CO 2 reduction performance; however, the concentrations in the products achieved in all the attempts so far were still low, ranging from 10 ppmV to 1000 ppmV [4][5][6]9] or from 1 μmol/g-cat to 100 μmol/g-cat [7,8,[11][12][13][14][15]. Therefore, a big breakthrough in increasing the concentration level of products is necessary to advance the CO 2 reduction technology in order to make the technology practically useful.…”

2D/2D Graphitic Carbon Nitride (g-C3N4) Heterojunction Nanocomposites for Photocatalysis: Why Does Face-to-Face Interface Matter?

“…Thus, this distinctly underlines the fundamental and technological importance of surface charge modification between two dissimilar 2D nanomaterials for robust interfacial interactions in unraveling the charge dynamics for enhanced photocatalysis. Benefiting from the predominant role of graphene as the electron reservoir (Zhang et al, , 2015bTan et al, 2015b;Mateo et al, 2016;Varadwaj and Nyamori, 2016), the photoinduced electrons were transferred from pCN to rGO across the interface to overwhelmingly suppress the charge recombination rate ( Figure 5E). All in all, the smart 2D/2D interface engineering design of graphene/g-C3N4 developed thus far is considered as an auspicious means, which could be eminently extended to heteroatom-doping graphenehybridized g-C3N4 for targeting superior photochemistry applications for real-life applications.…”

Effective Electrons Transfer Pathway of the Ternary TiO₂/RGO/Ag Nanocomposite with Enhanced Photocatalytic Activity under Visible Light

“…The ternary nanocomposite exhibited enhanced photocatalytic activities toward the photoreduction of CO2 into CH4 gas under their radiation of typical day light bulbs. [32] However, in most TiO2/RGO/Ag ternary systems under visible light, most of reported innovations mainly concentrated in synthesis means, microscopic morphology or application performance. Few reports formally proposed the electron-transfer mechanism that jumping into the conduction band (CB) of TiO2 from Ag.…”