6532-48-5Relevant articles and documents
Ultra-fast construction of CuBi2O4 films supported Bi2O3 with dominant (0 2 0) facets for efficient CO2 photoreduction in water vapor
Shi, Weina,Wang, Ji-Chao,Guo, Xiaowei,Tian, Hong-Ling,Zhang, Wanqing,Gao, Huiling,Han, Huijuan,Li, Renlong,Hou, Yuxia
supporting information, (2021/09/20)
CuBi2O4/Bi2O3 thin film was synthesized on the commercial glass by a spray pyrolysis-calcination method. The monoclinic phase Bi2O3 with dominant (0 2 0) facets was grown on the surface of tetragonal phase CuBi2O4 by the temperature control of spraying process. Photocatalytic activities of the synthesized materials for CO2 reduction were measured in the presence of water vapor under visible light irradiation (λ > 400 nm). The CO, CH4 and O2 yields of the optimal composite film reached 247.62, 119.27 and 418.00 μmol/m2 after 12 h of irradiation. The composite film resisted physical damage and showed good photocatalytic activity in the cycling tests. Moreover, it was found that the types of main products changed with the light intensity and their yields varied with the light wavelength. The exposed (0 2 0) facets efficiently improved the adsorbed ability for H2O molecules. Meanwhile, the hydrophobicity of the film surface ensured that the adsorbed sites of CO2 were unoccupied by abundant H2O molecules. The S-scheme charge transfer mechanism was further confirmed by the interlaced band alignment of the CuBi2O4/Bi2O3 heterostructure and the controlled experiment with different light conditions. The results gained in this report may open up an avenue to design advanced S-scheme heterostructures with suitable transitional-metal oxides for photoreduction CO2 to solar fuels.
Syntheses of ZnTi-LDH sensitized by tetra (4-carboxyphenyl) porphyrin for accerlating photocatalytic reduction of carbon dioxide
Guo, JiaQing,Li, JiaMin,Mu, Manman,Shen, Haochen,Wu, Guang,Yin, Xiaohong
, (2022/02/17)
A strategy of covalently combining layered double hydroxides (LDHs) with photosensitizer was designed to construct organic-inorganic heterojunction for prompting photocatalytic reduction of CO2. A series of tetra (4-carboxyphenyl) porphyrin sensitized ZnTi-LDH (TCPP/ZT) were prepared by an in site hydrothermal method to uniformly load the TCPP molecules on the ZnTi-LDH scaffold, on which the incorporation of TCPP not only broadens the light absorption range, but also facilitates separation and migration of the photogenerated charge carriers, thereby leads to enhancement of the photocatalytic activity. Among the TCPP/ZT, 2 ?wt% TCPP on ZT exhibited a superior photocatalytic performance in CO2 and the cumulative output of CH4 and CO in 5 ?h reached 8.65 ?μmol/g and 1.72 ?μmol/g, respectively, which are 2.50 and 1.56 times higher than those on ZnTi-LDH. The XPS spectra, photoelectrochemical tests and density functional theory (DFT) calculations proved the covalently binding TCPP with ZnTi-LDH through the carboxyl group in TCPP and hydroxyl group on ZnTi-LDH to form ester. Meanwhile the photo-induced electrons are transferred from TCPP to ZnTi-LDH. This work attempted and realized to apply tetra(4-carboxyphenyl)porphyrin sensitized ZnTi-LDH as photocatalyst in photocatalytic CO2 reduction.
Selective Catalytic Frustrated Lewis Pair Hydrogenation of CO2 in the Presence of Silylhalides
Grimme, Stefan,Jupp, Andrew R.,Qu, Zheng-Wang,Stephan, Douglas W.,Wang, Tongtong,Xu, Maotong
supporting information, p. 25771 - 25775 (2021/11/09)
The frustrated Lewis pair (FLP) derived from 2,6-lutidine and B(C6F5)3 is shown to mediate the catalytic hydrogenation of CO2 using H2 as the reductant and a silylhalide as an oxophile. The nature of the products can be controlled with the judicious selection of the silylhalide and the solvent. In this fashion, this metal-free catalysis affords avenues to the selective formation of the disilylacetal (R3SiOCH2OSiR3), methoxysilane (R3SiOCH3), methyliodide (CH3I) and methane (CH4) under mild conditions. DFT studies illuminate the complexities of the mechanism and account for the observed selectivity.
