Tailoring the oxidation state of metallic TiO through Ti3+/Ti2+ regulation for photocatalytic conversion of CO2 to C2H6

Selective CO2 Photoreduction to Acetate at Asymmetric Ternary Bridging Sites

“…− (Figure3f) in the13 CO 2 labeling GC-MS experiment, confirming the origin of the carbon in the product. The result clearly indicates that the CH 3 COOH product indeed arises from photocatalytic CO 2 reduction.Charge-Transfer Behavior and Band Structure.…”

“…The morphology and crystal structure are basically unchanged (Figure S8). The mass spectra show the signal at m/z = 61 which corresponds to 13 show that r-In 2 O 3 /InP has an earlier current response (Figure S9a), further confirming the rapid separation of photogenerated electron−hole pairs. In addition, the enhanced LSV performance in CO 2 with light irradiation, compared to that in N 2 or without light irradiation, suggests the high activity for photocatalytic CO 2 reduction (Figure S9b).…”

“…Photocatalytic CO 2 reduction to value-added fuels and chemicals is considered a potential approach for solving issues related to the greenhouse effect and rapid fossil fuel depletion. − Generally, C 1 fuels such as carbon monoxide (CO), methane (CH 4 ), and formic acid (HCOOH) are the common products of CO 2 reduction. − For comparison, C 2 products like acetylene (C 2 H 2 ), ethylene (C 2 H 4 ), ethane (C 2 H 6 ), ethanol (CH 3 CH 2 OH), and acetic acid (CH 3 COOH) are more valuable because of their higher energy densities and widespread applications. − As an organic acid, CH 3 COOH has drawn particular attention, and its global demand will reach 24.5 million tons by 2025. , C 2 products are usually difficult to achieve from CO 2 reduction because the multielectron–proton transfer and C–C coupling involved are thermodynamically difficult and kinetically sluggish. , Specifically, CO 2 conversion to CH 3 COOH is an eight-electron-transfer process, , and the same charge distribution between adjacent C 1 intermediates leads to strong dipole–dipole repulsion that hinders the C–C coupling.…”

Self-assembly of a heterogeneous microreactor with carbon dots embedded in Ti-MOF derived ZnIn2S4/TiO2 microcapsules for efficient CO2 photoreduction

“…The peaks of formaldehyde (HCHO − , 1507 and 1788 cm −1 ), methoxy groups (CH 3 O − , 1688 and 1734 cm −1 ), formic acid species (HCOO − , 1641 and 1658 cm −1 ), and carboxylate species (COO − , 1350 cm −1 ) are detected, indicating that they are primary intermediates during CO 2 photoreduction. 64–66 Besides, there are no CH 4 peaks, probably due to its nonpolar as well as low affinity.…”

Correlating Oxidation State and Surface Ligand Motifs with the Selectivity of CO2 Photoreduction to C2 Products

“…The nitrogen co-doping titanium monoxide (ZN-TC) as the catalyst and found that the selectivity of C 2 products is likely to be intrinsically correlated with the relative Ti 3 + /Ti 2 + ratio. [12] In this process, we built hollow nitrogen-doped titanium monoxide nanospheres to neglect the influence of carbon bases and adopted a systematic approach to exploring the intrinsic connection between the surface oxidation state and its product selectivity. The titanium oxynitride functions catalytically to produce C 2 products, while the product selectivity is controlled by the relative content and ratios of surface Ti x + (x = 2, 3, 4) whose qualities and distribution are influenced by NÀ TiÀ O/V[O] coordination motifs simultaneously.…”