6532-48-5Relevant academic research and scientific papers
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.
Highly Durable and Fully Dispersed Cobalt Diatomic Site Catalysts for CO2 Photoreduction to CH4
Wang, Jinming,Kim, Eunhyo,Kumar, Dharani Praveen,Rangappa, Akkammagari Putta,Kim, Yujin,Zhang, Yuexing,Kim, Tae Kyu
supporting information, (2021/12/30)
Dual-atom-site catalysts (DACs) have emerged as a new frontier in heterogeneous catalysis because the synergistic effect between adjacent metal atoms can promote their catalytic activity while maintaining the advantages of single-atom-site catalysts, such as almost 100 % atomic efficiency and excellent hydrocarbon selectivity. In this study, cobalt-based atom site catalysts with a Co2–N coordination structure were synthesized and used for photodriven CO2 reduction. The resulting CoDAC containing 3.5 % Co atoms demonstrated a superior atom ratio for CO2 reduction catalytic performance, with 65.0 % CH4 selectivity, which far exceeds that of cobalt-based single-atom-site catalysts (CoSACs). The intrinsic reason for the superior activity of CoDACs is the excellent adsorption strength of CO2 and CO* intermediates at dimeric Co active sites.
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.
Core-shell Cu@Cu2O nanoparticles embedded in 3D honeycomb-like N-doped graphitic carbon for photocatalytic CO2reduction
He, Lang,Liu, Sheng,Zhang, Wenyuan,Zhao, Kristin,Zhao, Yan
supporting information, p. 4758 - 4769 (2022/03/15)
A facile polymer thermal treatment method has been employed to fabricate 3D honeycomb-like nitrogen-doped graphitic carbons (N-GCs) with embedded core-shell Cu@Cu2O nanoparticles (NPs). The 3D honeycomb-like N-GC architectures can not only serve as an excellent carrier for core-shell Cu@Cu2O NPs, but also provide sufficient active sites and fast electron transmission channels. Under visible light irradiation, the Cu@Cu2O/N-GC-600 catalyst has the highest yields of CH4 and CO at 38.89 μmol g-1 and 27.78 μmol g-1, respectively. The excellent photocatalytic activity is attributed to the synergistic effects between the unique N-GC framework and core-shell Cu@Cu2O NPs, which accelerates the transfer of charge carriers and promotes the accumulation of photogenerated electrons on core-shell Cu@Cu2O. The results of this study may be beneficial for the design and synthesis of high-efficiency core-shell photocatalysts. This journal is
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.
Synthesis, characterization, and photocatalytic activity of stannum-doped MgIn2S4 microspheres
Yang, Wenhong,Dong, Yujing,Wang, Zhipeng,Li, Yuqin,Dai, Chunhui,Ma, Dongwei,Jia, Yu,Yang, Zhen,Zeng, Chao
, (2021/01/05)
A series of Sn2+ doped MgIn2S4 photocatalysts were prepared via a facial hydrothermal method. The Sn dopants substitute the sites of Mg atom in MgIn2S4 unit cell, but not alter the crystal structure, demonstrated by the results of XRD and XPS. Compared to pristine MgIn2S4, Sn-doped MgIn2S4 samples exhibit significantly enhanced photocatalytic CO2 reduction activity. With increasing the Sn dopant content, the CO2 conversion rate first ascends, achieving the maximum rate at Sn-MgIn2S4-2 sample, and then decreases. After illumination for 4 h, the highest yield of CO and CH4 for Sn-MgIn2S4-2 sample reaches about 3.35 and 3.33 times higher than that of pristine MgIn2S4. The theoretical results based on density functional theory calculations reveal that Sn doping in MgIn2S4 tunes the band structure from the direct-transition of MgIn2S4 to indirect-transition, diminishes band gap and extends the light absorption range, reduces the effective masses of holes and promotes the migration of photoinduced carriers. The experimental results also demonstrate the positive role of Sn dopant in accelerating the separation and transportation of charges, and improving CO2 adsorption ability. This work systematically investigates and discusses the Sn2+ doping effect in MgIn2S4 on crystal structure, lattice variations, electronic band structures, CO2 adsorption ability, and photocatalytic CO2 reduction activity, which can provide a new hint for the fabrication of efficient photocatalyst by metal ion doping.
Constructed Z-Scheme g-C3N4/Ag3VO4/rGO Photocatalysts with Multi-interfacial Electron-Transfer Paths for High Photoreduction of CO2
Gao, Ming,Sun, Linlin,Ma, Changchang,Li, Xin,Jiang, Haopeng,Shen, Dong,Wang, Huiqin,Huo, Pengwei
supporting information, p. 1755 - 1766 (2021/02/06)
Z-scheme g-C3N4/Ag3VO4/reduced graphene oxide (rGO) photocatalysts with multi-interfacial electron-transfer paths enhancing CO2 photoreduction under UV-vis light irradiation were successfully prepared by a hydrothermal process. Transmission electron microscope images displayed that the prepared photocatalysts have a unique 2D-0D-2D ternary sandwich structure. Photoelectrochemical characterizations including TPR, electrochemical impedance spectroscopy, photoluminescence, and linear sweep voltammetry explained that the multi-interfacial structure effectively improved the separation and transmission capabilities of photogenerated carriers. Electron spin resonance spectroscopy and band position analysis proved that the electron-transfer mode of g-C3N4/Ag3VO4 meets the Z-scheme mechanism. The introduction of rGO provided more electron-transfer paths for the photocatalysts and enhanced the stability of Ag-based semiconductors. In addition, the π-πconjugation effect between g-C3N4 and rGO further improved the generation and separation efficiency of photogenerated electron-hole pairs. Then, the multiple channels (Ag3VO4 → CN, Ag3VO4 → rGO → CN, and rGO → CN) due to the 2D-0D-2D structure greatly improving the photocatalytic CO2 reduction ability have been discussed in detail.
Stabilization of ultra-small gold nanoparticles in a photochromic organic cage: modulating photocatalytic CO2reduction by tuning light irradiation
Singh, Ashish,Verma, Parul,Samanta, Debabrata,Dey, Anupam,Dey, Jyotirmoy,Maji, Tapas Kumar
supporting information, p. 5780 - 5786 (2021/03/16)
Synthesis and stabilization of ultra-small metal nanoparticles (MNPs) composed of a few atoms are of paramount importance in modulating their material properties based on quantum confinement effects. The highly reactive surface of small MNPs tends to aggregate, resulting in bigger particles and subsequent deterioration of the catalytic activity. In this work, we exploited a dithienylethene (DTE) based photochromic organic cage (TAE-DTE) for thein situstabilization of ultra-small Au NPs (Au@TAE-DTE) (2reduction to CO. Importantly, irradiating with light of the full range (λ= 250-750 nm) allowed for co-existence of both photoisomers which thereby showed wide spectrum absorption as compared to individual photoisomers, consequently displaying substantially enhanced performance for the photocatalytic CO2reduction. Further, the real-time progress of the CO2reduction reaction and corresponding reaction intermediates was detected by anin situDRIFT experiment.
In situ α-Fe2O3modified La2Ti2O7with enhanced photocatalytic CO2reduction activity
Zhang, Zifan,Lin, Yuan,Liu, Qianwen,Wang, Xuxu,Fu, Xianzhi,Su, Wenyue
, p. 6438 - 6444 (2021/10/12)
Developing high-efficiency photocatalysts for CO2 photoreduction is one of the potential solutions to address both energy and pollution issues. In this study, α-Fe2O3 modified La2Ti2O7 was successfully synthesized with intimate contact between La2Ti2O7 an
In-situ growth of PbI2 on ligand-free FAPbBr3 nanocrystals to significantly ameliorate the stability of CO2 photoreduction
Guo, Ning-Na,Liu, Zhao-Lei,Lu, Tong-Bu,Mu, Yan-Fei,Yao, Yuan,Zhang, Meng-Ran,Zhang, Min
supporting information, (2021/12/02)
Excellent optical properties involving strong visible light response and superior carrier transport endow metal halide perovskites (MHP) with a fascinating prospect in the field of photocatalysis. Nevertheless, the poor stability of MHP nanocrystals (NCs) in water-contained system, especially without the protection of long alkyl chain ligands, severely restricts their photocatalytic performance. In this context, we report an effortless strategy for the generation of ligand-free MHP NCs based photocatalyst with high water tolerance, by coating PbI2 on the surface of ligand-free formamidinium lead bromide (FAPbBr3) NCs via the facile procedure of in-situ conversion with the aid of ZnI2. Under the protection of PbI2 layer, the resultant FAPbBr3/PbI2 composite exhibits significantly ameliorated stability in an artificial photosynthesis system with CO2 and H2O vapor as feedstocks. Moreover, the formation of compact PbI2 layer can accelerate the separation of photogenerated carriers in FAPbBr3 NCs, bringing forth a remarkable improvement of CO2 photoreduction efficiency with an impressive electron consumption yield of 2053 μmol/g in the absence of organic sacrificial agents, which is 7-fold over that of pristine FAPbBr3 NCs.
