Recent advances on covalent organic frameworks (COFs) as photocatalysts: different strategies for enhancing hydrogen generation

Gu, Chang-Cheng; Zhu, Wenfeng; Wu, Ren‐Jang; Deng, Lu; Zhang, Jun; Weng, Baicheng; Zhu, Rilong

doi:10.1039/d3cc01970e

Cited by 31 publications

(13 citation statements)

References 173 publications

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“…The slight upward trend of the turbidity curves of iCON-(1–4) also proves that the nanosheets are still self-stripping. In addition, the active site is deeply encapsulated due to the layer-by-layer stacking of COFs, which strictly restricts electron transfer . Remarkably, iCONs can self-exfoliate into nanosheets in H 2 O, and ultrathin nanosheets offer numerous interfaces as reaction sites for electron–hole separation, which facilitates the release of hydrogen.…”

Section: Resultsmentioning

confidence: 99%

Alkene-Bridged Ionic Covalent Organic Nanosheets (iCONs) Based on D-π-A for Photocatalytic Hydrogen Evolution

Yang,

Zhang,

et al. 2024

ACS Catal.

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Hydrophilicity, dispersivity, and charge-carrier separation are major factors that vitally affect photocatalytic hydrogen evolution (PHE). However, there has been relatively little research on considering these factors simultaneously. In this work, a series of 2D sp 2 carbon-linked ionic covalent organic nanosheets (iCON-(1− 4)) based on the D-π-A structure are designed and synthesized. iCONs with an ionic nature and ultrathin layered structures greatly promote their hydrophilicity and dispersivity as photocatalysts in catalytic systems and offer numerous interfaces as reaction sites for electron−hole separation. Furthermore, the ultrathin nanosheets possess the advantage of being beneficial to Pt loading apart from facilitating the utilization of surface-active sites. Only 1.5 wt % Pt was added to achieve maximum hydrogen release. Subsequently, triphenylamine was employed as a strong donor and N + can act as a strong acceptor, and iCON-4 synthesized by the strong−strong union method exhibits a hydrogen production efficiency of 9519 μmol g −1 h −1 , which is the highest among iCON-(1−4). Interestingly, the extremely wide visible-light absorption range of iCON-(3−4) extends to about 700 nm and exceeds most photocatalytic semiconductor materials and provides a prerequisite for water decomposition. This work highlights a design concept for PHE in terms of hydrophilicity, dispersivity, charge-carrier separation, and band regulation. It is worth mentioning that iCONs are fabricated by the one-pot method and have not been employed to PHE before.

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Section: Resultsmentioning

confidence: 99%

Alkene-Bridged Ionic Covalent Organic Nanosheets (iCONs) Based on D-π-A for Photocatalytic Hydrogen Evolution

Yang,

Zhang,

et al. 2024

ACS Catal.

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“…Therefore, some of the strategies such as structure engineering, linkage pre-design, bandgap engineering, crystallinity optimization, metal species utilization, COF hybrids and heterojunction formation can be done to enhance the utilization of COFs in photocatalysis. 115…”

Section: Nanomaterials Selection and Criteria For Photocatalysismentioning

confidence: 99%

Design and development of nanostructured photocatalysts for large-scale solar green hydrogen generation

Sahu,

Champati,

Pradhan

et al. 2024

Sustainable Energy Fuels

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“…Covalent organic frameworks (COFs) are crystalline organic porous materials with a well-defined structure . Recently, two-dimensional (2D) COFs with π–π stacking have drawn major interest because of their structural versatility, tunable electronic properties, and potential applications in a plethora of areas such as gas storage/separation, optoelectronics, drug delivery, etc. , COFs are also interesting candidates for sensing applications because the active sites and delocalized π electrons are evenly distributed throughout the structure in COFs, which brings effective signal transduction . Owing to the π–π stacking interaction, the efficient electron transfer in these 2D COFs can endow them with semiconducting properties.…”

Section: Introductionmentioning

confidence: 99%

Palladium-Nanoparticle-Decorated Covalent Organic Framework Nanosheets for Effective Hydrogen Gas Sensors

Krishnaveni,

Esclance DMello,

Sahoo

et al. 2023

ACS Appl. Nano Mater.

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Covalent organic frameworks (COFs) are attractive for chemical sensing applications because their structures contain delocalized π electrons and active sites that are evenly distributed. COF-based chemical sensors are largely restricted to luminescence and absorption-based mechanisms of sensing. The present study demonstrates the potentiality of exfoliated COF nanosheets hybridized with palladium nanoparticles (Pd NPs) for effective chemiresistive H2 sensing, for the first time. The hybridization of Pd NPs with the nanosheets of an imine-based covalent organic framework ( e Pd@TpPa-SO3H COF) has turned an innocent bulk COF into an effective chemiresistive H2 sensor.

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Recent advances on covalent organic frameworks (COFs) as photocatalysts: different strategies for enhancing hydrogen generation

Abstract: The excessive employment of traditional fossil fuels has caused energy dilemma and environmental pollution. Solar-driven hydrogen generation has attracted many attentions in recent years owing to its environmental friendliness and...

Cited by 31 publications

References 173 publications

Alkene-Bridged Ionic Covalent Organic Nanosheets (iCONs) Based on D-π-A for Photocatalytic Hydrogen Evolution

Alkene-Bridged Ionic Covalent Organic Nanosheets (iCONs) Based on D-π-A for Photocatalytic Hydrogen Evolution

Design and development of nanostructured photocatalysts for large-scale solar green hydrogen generation

Palladium-Nanoparticle-Decorated Covalent Organic Framework Nanosheets for Effective Hydrogen Gas Sensors

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