Related references
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Article
Chemistry, Multidisciplinary
Saikat Bag et al.
Summary: We successfully synthesized uniform covalent organic framework (COF) thin films using a solution-processable sphere transmutation process, which exhibited good crystallinity, porosity, and uniform thickness on a fluorine-doped tin oxide (FTO) surface. Four different COF thin films with different functional backbones were synthesized, and the TpEtBr COF film showed the lowest optical band gap and highest excited-state lifetime. All of the COF films exhibited significant photocurrent after illumination with visible light, indicating good photoactive characteristics. The out-of-plane photodetector device based on the TpEtBr COF thin film showed high photocurrent density and hole mobility, demonstrating the best photoactive properties.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
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Qun Guan et al.
Summary: Multicomponent reactions (MCRs) combine multiple reactants to efficiently synthesize a desired product, and can be applied in both organic synthesis and materials chemistry. This includes the synthesis of covalent organic frameworks (COFs), crystalline porous materials with diverse properties and applications. MCRs offer advantages for COF synthesis, such as improved structural stability and increased crystallization driving forces, resulting in the preparation of robust COFs with diverse applications. This perspective article provides an overview of MCRs, discusses their application in COF synthesis, and addresses critical challenges and future perspectives for the design of new robust COFs.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
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Ting He et al.
Summary: The intensifying energy crises and environmental issues have sparked the research on renewable energy sources, sustainable energy conversion, and storage technologies. Photocatalysis, a green technology, converts eco-friendly solar energy into high-energy chemicals. Covalent organic frameworks (COFs), with their pre-designable structures, high crystallinity, and porosity, show promising potential for converting solar energy into chemicals. This Review highlights recent progress in COF-based photocatalysts synthesis and their applications in water splitting, CO2 reduction, and H2O2 production, while discussing the challenges and future opportunities for their rational design.
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Lu Dai et al.
Summary: This study focuses on COFs-based photocatalysts, in which a 2D fully conjugated ethylene-linked COF (BTT-BPy-COF) with active sites was fabricated. A post-protonation strategy was employed to fine-tune the active sites, leading to improved charge-separation efficiency and increased hydrophilicity. The optimized BTT-BPy-PCOF exhibited a remarkable H-2 evolution rate under visible light, surpassing a biphenyl-based COF 6 times. Post-protonation was proven to be a potential universal strategy for promoting photocatalytic H-2 evolution and providing important guidance for the design of highly efficient organic semiconductor photocatalysts.
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(2023)
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Linlin Zhang et al.
Summary: Natural photosynthesis utilizes solar energy to generate oxygen and carbohydrates from water and CO2, while artificial photosynthesis produces fuels and chemicals from renewable energy through water or CO2 splitting. However, the coupling of hydrogen evolution or CO2 reduction with slow water oxidation reduces efficiencies and raises safety concerns. Decoupled artificial photosynthesis (DAP) has emerged as a solution, and this review explores its evolution from natural and artificial photosynthesis, as well as its distinct mechanisms in energy capture, transduction, and conversion. Advances in DAP are summarized in terms of photochemical, photoelectrochemical, and photovoltaic-electrochemical catalysis, with a focus on the energy transduction process. Challenges and perspectives for future research are also discussed.
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Hui Yang et al.
Summary: In this study, an isoreticular family of multivariate COFs with chromenoquinoline rings and electron-donating or withdrawing groups were synthesized and used as photocatalysts. The intramolecular donor-acceptor interactions in the COFs enabled tuning of charge distribution and carrier separation, leading to improved photocatalytic performance. By optimizing the optoelectronic properties, a nitro-functionalized multicomponent COF achieved a photocatalytic uranium extraction efficiency of 8.02 mg/g/day in natural seawater, surpassing all previously reported COFs. These findings demonstrate an effective design strategy for high-activity COF photocatalysts with intramolecular D-A structures not easily accessible through traditional synthetic methods.
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Ziao Chen et al.
Summary: This study proposes a synthetic strategy for constructing 1D-COFs and investigates the mechanism of improved fluorescence performance. By introducing non-covalent interactions, non-radiative transitions can be weakened, thus enhancing the fluorescence intensity of 1D-COFs.
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Rui Xu et al.
Summary: An effective tandem photocatalysis strategy has been developed by constructing synergistic dual sites in rhenium-(I) bipyridine fac-[ReI(bpy)(CO)3Cl] (Re-bpy) and copper-porphyrinic triazine framework [PTF(Cu)] to support CO2 conversion to ethylene. This work provides a new pathway for the design of efficient photocatalysts for photoconversion of CO2 to C2 products via a tandem process driven by visible light under mild conditions.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
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Yu-Jie Wang et al.
Summary: In this study, a co-dissolved strategy was employed to incorporate mono-dispersed Pt center into V2O5 support by dissolving [PtV9O28](7-) into [V10O28](6-) aqueous solution. The uniform dispersion of [PtV9O28](7-) in [V10O28](6-) solution allowed for the PtV9O28(7-) to be encapsulated by V10O28(6-) clusters through a freeze-drying process. The resulting Pt-V2O5 single-atom-site catalysts exhibited significantly higher CH4 yield and efficient CO2 photoreduction.
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Qiu-Jin Wu et al.
Summary: We present the first example of a charged imidazolium functionalized porphyrin-based covalent organic framework for electrocatalytic CO2 reduction reaction. The free anions of imidazolium ions nearby the active sites can stabilize the key intermediate and inhibit hydrogen evolution reaction. Thus, the charged imidazolium functionalized covalent organic framework exhibits higher activity than the neutral version and follows a trend depending on the anion.
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Shuhao An et al.
Summary: In this study, one-dimensional covalent organic frameworks (1D COFs) were used for the oxygen reduction reaction (ORR) and demonstrated excellent catalytic performance. Compared to two-dimensional COFs (2D COFs), 1D COFs showed larger electrochemically active surface areas and higher selectivity and activity. This work paves the way for the development of low-dimensional COFs for electrocatalysis.
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(2023)
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Chemistry, Inorganic & Nuclear
Yun-Nan Gong et al.
Summary: This review summarizes the synthesis methods, structural features, and photocatalytic applications of covalent organic frameworks (COFs). Strategies for improving photocatalytic performance and future challenges and prospects are also discussed.
COORDINATION CHEMISTRY REVIEWS
(2023)
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Zijun Yong et al.
Summary: This article provides a systematic overview of the advances and challenges of covalent organic frameworks (COFs) in photocatalytic H2O2 production and offers perspectives and outlooks for future developments in this field.
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Shuailong Yang et al.
Summary: In this study, a nickel-modified COF was reported to enhance the photocatalytic reduction of CO2 by modifying the linkage microenvironment.
ADVANCED FUNCTIONAL MATERIALS
(2022)
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Shuailong Yang et al.
Summary: Covalent organic frameworks (COFs) are promising platforms for solar-to-chemical energy conversion. However, their poor chemical stability and weak optoelectronic properties need to be improved. In this study, a simple post-treatment method was used to enhance the stability and photophysical properties of a COF, leading to improved photocatalytic hydrogen evolution efficiency.
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Bin Han et al.
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Lei Zou et al.
Summary: In this study, a CdS@COF core-shell structure was successfully synthesized through a structural and electronic engineering strategy, which significantly improved the efficiency of photocatalytic CO2 reduction. The integration of CdS as an electron transfer channel enables photoelectron transfer and subsequent CO2 reduction from Zn-porphyrin to Co-bipyridyl units.
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Chang He et al.
Summary: This study reports the first stable CO2-masked N-heterocyclic carbenes (NHCs) grafted on a porous crystalline covalent organic framework (COF), and demonstrates their superior catalytic performances in hydrosilylation and N-formylation reactions. The NHC sites can be easily recycled and reused while maintaining excellent catalytic activity.
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Yongliang Yang et al.
Summary: In this study, COFs with different linkage structures were synthesized and evaluated. It was found that the acrylonitrile linkage enhanced the stability, optoelectronic properties, and photocatalytic activity of the COFs. These findings provide valuable insights for the design of optoelectronic functional materials.
Review
Chemistry, Multidisciplinary
Bo Gui et al.
Summary: This review summarizes the key strategies and techniques used to diversify and determine the structure of 3D covalent organic frameworks (COFs). The challenges and prospects regarding the structural design and determination of 3D COFs are also discussed.
TRENDS IN CHEMISTRY
(2022)
Review
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Bipasa Samanta et al.
Summary: Understanding the water splitting mechanism in photocatalysis is crucial for producing clean fuel in the future. Different theoretical methods at various scales have strengths and drawbacks, and a combination of methods is needed to model complex nano-photocatalysts accurately.
CHEMICAL SOCIETY REVIEWS
(2022)
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Luca Cusin et al.
Summary: Imine-based COFs are functional, crystalline, and porous nanostructures with relatively easy crystallization, but the stability of the imine bond is limited, making it unsuitable for harsh conditions. Solutions are needed to increase the potential of these materials, potentially through chemical conversion and locking of the imine bond to enhance framework robustness and functionality.
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(2021)
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Yan Yue et al.
Summary: The study focuses on the development of highly stable bimetallic COFs for electrocatalytic CO2 reduction. The resulting CuPcF8-CoNPc-COF exhibits exceptional stability and electrocatalytic performance, with a faradaic efficiency of 97% and a turnover frequency of 2.87 s(-1).
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Zhi-An Lan et al.
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Ha L. Nguyen et al.
Summary: Covalent organic frameworks (COFs) are a new class of porous crystalline materials with semiconductor properties, showing promising performance in CO2 photoreduction catalysis. Principles of design and recent advancements in using COFs for CO2 photoreduction can serve as a reference for developing CO2 reduction catalysts.
Review
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Xiaojia Zhao et al.
Summary: This article introduces the application potential of covalent organic frameworks and discusses the design and synthesis strategies for their use in electrochemical applications. The focus is on the recent development of hybrid COF materials and COFs with hierarchical porosity which can address the challenges in electrochemical applications of COFs. Challenges and future trends in the use of COF materials in electrochemical applications are also outlined.
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