Direct evidence of charge separation in a metal–organic framework: efficient and selective photocatalytic oxidative coupling of amines <i>via</i> charge and energy transfer

Xu, Caiyun; Liu, Hang; Li, Dandan; Su, Ji‐Hu; Jiang, Hai‐Long

doi:10.1039/c7sc05296k

Cited by 262 publications

(207 citation statements)

References 47 publications

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“…As described previously, UiO‐66 had a BDC as the organic linker while the organic linker of MOF‐808 contains an additional carboxylic group, resulting in a more red‐shifted absorption band edge as illustrated in Figure d. The photoexcited electrons on the organic linkers were then injected into SBUs and separated from holes via a ligand to cluster charge transfer process . The separated electron and charge pair would decay in the microsecond time, generating a fluorescence after the electrons flew back to the organic linkers .…”

Section: Resultsmentioning

confidence: 96%

Enhancing Efficiency and Stability of Photovoltaic Cells by Using Perovskite/Zr‐MOF Heterojunction Including Bilayer and Hybrid Structures

et al. 2019

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In this study, the effectiveness of using a perovskite/Zr‐metal–organic frameworks (MOFs) heterojunction in realizing efficient and stable inverted p–i–n perovskite solar cells (PVSCs) is demonstrated. Two types of Zr‐MOFs, UiO‐66 and MOF‐808, are investigated owing to their respectable moisture and chemical stabilities. The MOFs while serving as an interlayer in conjunction with the perovskite film are shown to possess the advantages of UV‐filtering capability and enhancing perovskite crystallinity. Consequently, the UiO‐66/MOF‐808‐modified PVSCs yield enhanced power conversion efficiencies (PCEs) of 17.01% and 16.55%, outperforming the control device (15.79%). While further utilizing a perovskite/Zr‐MOF hybrid heterojunction to fabricate the devices, the hybrid MOFs are found to possibly distribute over the perovskite grain boundary providing a grain‐locking effect to simultaneously passivate the defects and to reinforce the film's robustness against moisture invasion. As a result, the PCEs of the UiO‐66/MOF‐808‐hybrid PVSCs are further enhanced to 18.01% and 17.81%, respectively. Besides, over 70% of the initial PCE is retained after being stored in air (25 °C and relative humidity of 60 ± 5%) for over 2 weeks, in contrast to the quick degradation observed for the control device. This study demonstrates the promising potential of using perovskite/MOF heterojunctions to fabricate efficient and stable PVSCs.

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Section: Resultsmentioning

confidence: 96%

Enhancing Efficiency and Stability of Photovoltaic Cells by Using Perovskite/Zr‐MOF Heterojunction Including Bilayer and Hybrid Structures

et al. 2019

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“…Hence, significant efforts have been dedicated to develop mild and practical methodologies for imine formation 50,51. Among all the methodologies, photoinduced aerobic oxidation of amines turns out as an effective and sustainable approach from the view of green chemistry, as it can efficiently utilize sunlight, requiring relative mild and neat conditions 52–55. At the outset, dibenzylamine was chosen as a model substrate to optimize the reaction conditions (Table S2†).…”

Section: Resultsmentioning

confidence: 99%

Visible-light harvesting pyrene-based MOFs as efficient ROS generators

Zhang

Pang

et al. 2019

Chem. Sci.

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“…The band structure and CBM of ACM‐1 also suggest possibilities for oxidation. A common photocatalytic oxidation pathway proceeds via the reduction of O 2 to O 2 − (superoxide) . The absolute potential of this reduction is −4.31 eV, which renders it thermodynamically feasible upon photoexcitation of ACM‐1 (CBM: −4.10 eV).…”

Section: Figurementioning

confidence: 99%

A Titanium Metal–Organic Framework with Visible‐Light‐Responsive Photocatalytic Activity

et al. 2020

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The one‐step synthesis and characterization of a new and robust titanium‐based metal–organic framework, ACM‐1, is reported. In this structure, which is based on infinite Ti−O chains and 4,4′,4′′,4′′′‐(pyrene‐1,3,6,8‐tetrayl) tetrabenzoic acid as a photosensitizer ligand, the combination of highly mobile photogenerated electrons and a strong hole localization at the organic linker results in large charge‐separation lifetimes. The suitable energies for band gap and conduction band minimum (CBM) offer great potential for a wide range of photocatalytic reactions, from hydrogen evolution to the selective oxidation of organic substrates.

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Direct evidence of charge separation in a metal–organic framework: efficient and selective photocatalytic oxidative coupling of amines via charge and energy transfer

Abstract: For the first time, the photoexcited charge separation in a metal–organic framework has been evidenced with clear ESR signals, based on efficient and selective photocatalytic oxidative coupling of amines.

Cited by 262 publications

References 47 publications

Enhancing Efficiency and Stability of Photovoltaic Cells by Using Perovskite/Zr‐MOF Heterojunction Including Bilayer and Hybrid Structures

Enhancing Efficiency and Stability of Photovoltaic Cells by Using Perovskite/Zr‐MOF Heterojunction Including Bilayer and Hybrid Structures

Visible-light harvesting pyrene-based MOFs as efficient ROS generators

A Titanium Metal–Organic Framework with Visible‐Light‐Responsive Photocatalytic Activity

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