A Novel One-Dimensional Porphyrin-Based Covalent Organic Framework

Zhang, Miao; Zheng, Ruijin; Ma, Ying; Chen, Ruiping; Sun, Xuan

doi:10.3390/molecules24183361

Cited by 8 publications

(8 citation statements)

References 44 publications

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“…The absence of the NH stretching vibration band in the range 3200–3400 cm −1 confirms that the diamine group of the monomer 4,4″‐diamino‐p‐terphenyl has been completely reacted. [ 53 ] The band at 1620 cm −1 corresponds to the CN stretching vibration that confirms the formation of the imine‐linked COF ring by the reacted monomers. [ 54 ] The Fe 3 O 4 @COF‐2 inherits the peak of COF, additionally displaying a strong peak at 570 cm −1 corresponding to the FeOFe vibration of Fe 3 O 4 .…”

Section: Resultsmentioning

confidence: 98%

Nanoarchitectonics of Triboelectric Nanogenerator for Conversion of Abundant Mechanical Energy to Green Hydrogen

Ghosh

Iffelsberger

Konečný

et al. 2023

Advanced Energy Materials

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In the present world, the high energy demand rapidly depletes existing fossil fuel reserves, urging the necessity to harvest energy from clean and renewable resources. In this study, the use of a triboelectric nanogenerator (TENG) is shown beyond the conventional practice of use in self‐powered electronics, to the production of green hydrogen from renewable mechanical energy. For the first time the use of a magnetic covalent organic framework composite as positive triboelectric material for a contact‐separation mode TENG (CS‐TENG) in which MXene incorporated polydimethylsiloxane (PDMS) film serves as negative triboelectric material, is demonstrated. A facile way of incorporating micropatterns on the surface of PDMS/MXene film is shown utilizing the advantages of 3D printing technology. The CS‐TENG harvests energy from simple mechanical actions such as human handclapping and toe‐tapping. The energy from such low‐scale mechanical actions is applied for water electrolysis. Scanning electrochemical microscopy is employed to confirm the evolution of hydrogen and oxygen by the harvested electrical energy from mechanical actions. This research is expected to pave the way for producing green hydrogen anywhere, by utilizing the mechanical energy from nature such as raindrops, wind, and the movement of vehicles.

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Section: Resultsmentioning

confidence: 98%

Nanoarchitectonics of Triboelectric Nanogenerator for Conversion of Abundant Mechanical Energy to Green Hydrogen

Ghosh

Iffelsberger

Konečný

et al. 2023

Advanced Energy Materials

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“…One-dimensional COFs are formed by the covalent bonding of organic molecules, exhibiting periodic repeating units along the one-dimensional direction, similar to the structure of polymer chains. 33 However, the current means of constructing one-dimensional COF are very limited. In 2019, we seamlessly synthesized poly(Pt-BA2DA) 34 via a remarkable [4 + 4] cycloaddition employing topological chemical polymerization (Figure 1a and 1b).…”

Section: Classification Of Cofsmentioning

confidence: 99%

Designing and Molding Covalent Organic Frameworks for Separation Applications

Wang,

Yang,

Zhang

2023

Acc. Mater. Res.

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Conspectus Separation processes hold a pivotal role not only in the modern chemical industry but also in our daily lives. Yet, conventional separation methods have been synonymous with excessive energy consumption, exacerbating global environmental concerns. Therefore, exploring alternative separation technologies with low energy consumption and environmental friendliness is of great significance and in urgent demand. Porous materials have emerged as a beacon of hope in this regard, offering superior energy efficiency, minimal environmental impact, and scalability. Presently, porous polymeric materials have found extensive use in separation applications. However, a significant drawback lies in the amorphous nature of traditional polymers, making precise control over their pore architecture at the molecular level a daunting task. Additionally, deciphering their intricate structures for a comprehensive understanding of the structure–function relationship presents challenges. Recently, porous framework polymers represented by covalent organic frameworks (COFs) have emerged as a new class of crystalline porous polymers that features low densities, well-defined structures, high surface areas, adjustable pore sizes, and facilely tailored functionality, thus exhibiting huge potential in the field of separations. Furthermore, the defined crystal structures and precise regulation of the pore environment render COFs perfect platforms for investigating separation mechanisms and structure–function relationships. Regrettably, despite their immense potential in separation applications, COFs face significant challenges. (1) Many reported COFs have pores larger than 1 nm or lack the specific binding sites essential for separating small molecules, particularly gases, which limits their effectiveness in gas separation processes. (2) Conventional synthesis methods, like solvothermal techniques, often yield powdery COF samples, posing difficulties in molding them for practical applications. (3) The large-scale, cost-effective production of high-quality COFs that meet the rigorous demands of industrial applications remains an underexplored frontier. These persistent challenges underscore the need for innovative research and development efforts to unleash the full potential of COFs in addressing critical separation challenges and advancing industrial processes. Addressing the above challenges, in this Account, we mainly summarize the recent research progress achieved by our team, including the following: (i) designing various COFs as highly efficient separators via synthesis strategies, such as generating a penetrated structure, introducing binding sites, and adjusting the pore size; (ii) creating various molding strategies including a cross-linking strategy, nanotape strategy, and melt polymerization strategy to fabricate COFs into membranes or monoliths; (iii) exploring the separation application scopes of COFs, such as gas separation, pollutant removal, and water treatment. And, we point out the existing challenges and future devel...

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“…This may be due to relatively weak p-p interlayer interactions caused by the electronic effect of the quaternary ammonium salt. 47 From the literature, Sick et al 48 achieved a reversible control of COF crystallinity by using supercritical CO 2 . Bu et al 49 restored the crystallinity of the COF by treatment with different polar solvents.…”

Section: Preparation and Structural Characterizationmentioning

confidence: 99%