Two‐Phase System Utilizing Hydrophobic Metal–Organic Frameworks (MOFs) for Photocatalytic Synthesis of Hydrogen Peroxide

Isaka, Yusuke; Kawase, Yudai; Kuwahara, Yasutaka; Mori, Kohsuke; Yamashita, Hiromi

doi:10.1002/ange.201901961

Cited by 43 publications

(27 citation statements)

References 38 publications

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“…The photocatalyst is dispersed in one phase (benzyl alcohol) where oxidation reaction takes place, whereas in the other phase (water) reduction of O 2 to form H 2 O 2 occurs. 20 , 21 This promoted separation and avoided catalytic decomposition of H 2 O 2 . Photocatalytic pathways provide a sustainable route for H 2 O 2 synthesis as they involve (i) a one-step reaction, (ii) utilization of green reagents, and (iii) light as the source of energy.…”

Section: Introductionmentioning

confidence: 99%

Strongly Reducing (Diarylamino)benzene-Based Covalent Organic Framework for Metal-Free Visible Light Photocatalytic H₂O₂ Generation

et al. 2020

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Photocatalytic reduction of molecular oxygen is a promising route toward sustainable production of hydrogen peroxide (H 2 O 2 ). This challenging process requires photoactive semiconductors enabling solar energy driven generation and separation of electrons and holes with high charge transfer kinetics. Covalent organic frameworks (COFs) are an emerging class of photoactive semiconductors, tunable at a molecular level for high charge carrier generation and transfer. Herein, we report two newly designed two-dimensional COFs based on a (diarylamino)benzene linker that form a Kagome ( kgm ) lattice and show strong visible light absorption. Their high crystallinity and large surface areas (up to 1165 m 2 ·g –1 ) allow efficient charge transfer and diffusion. The diarylamine (donor) unit promotes strong reduction properties, enabling these COFs to efficiently reduce oxygen to form H 2 O 2 . Overall, the use of a metal-free, recyclable photocatalytic system allows efficient photocatalytic solar transformations.

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Section: Introductionmentioning

confidence: 99%

Strongly Reducing (Diarylamino)benzene-Based Covalent Organic Framework for Metal-Free Visible Light Photocatalytic H₂O₂ Generation

et al. 2020

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“…Herein, we report an interfacially confined strategy by constructing interfacial pores between MOFs and covalent organic frameworks (COFs) with controlled surface wettability as nanoreactors for efficient photocatalysis. COFs are a new class of crystalline porous materials made from light elements (B, C, N, O, H), which have gained increasing interest in various applications. − In this work, NH 2 -MIL-125(Ti) (Ti-MOF) was chosen due to its great promise in photocatalysis, − and a hydrophobic dimethylated COF-LZU1 (DM-LZU1) was developed as the shell, with Pt NPs confining in the interfacial pores (∼19 nm) between the MOFs and the COFs. On one hand, the presence of Pt promotes the charge separation in Ti-MOFs to form electron-rich Pt NPs.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic MOFs@Metal Nanoparticles@COFs for Interfacially Confined Photocatalysis with High Efficiency

Sun

Kim

2020

ACS Appl. Mater. Interfaces

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Converting solar energy to chemical energy via photocatalysis has attracted increasing interest. Simultaneously realizing efficient charge separation and fast reactant/product diffusion/transport is highly significant for improving the photocatalytic activity, which however is difficult. Herein, we reported an interfacially confined strategy by constructing interfacial pores as nanoreactors between metal−organic frameworks (MOFs) and covalent organic frameworks (COFs) with controlled surface wettability for efficient photocatalysis. In the sandwich Ti-MOFs@Pt@DM-LZU1, interfacial pores formed between Ti-MOF@Pt and DM-LZU1, in which Pt nanoparticles (NPs) were encapsulated. The presence of Pt facilitates the charge separation on the photoactive Ti-MOF, while the hydrophobic porous DM-LZU1 shell promotes reactant enrichment. Interfacial pores acting as nanoreactors ensure fast electron and mass transport between the active Pt NPs and the concentrated reactants, leading to high photocatalytic activity. This work presents a new concept for the design of various photocatalysts with considerable activity.

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“…Recently, a MIL-125-NH2 MOFs material for photocatalytic H2O2 production in a benzylalcohol/water two-phase system was exploited and reported Yamashita's group used a MIL-125-NH2 MOFs material for photocatalytic H2O2 production in a benzylalcohol/water two-phase system [73] (Fig. 12 a).…”

Section: Metal-organic Frameworkmentioning

confidence: 99%

Photocatalytic Production of Hydrogen Peroxide over Modified Semiconductor Materials: A Minireview

et al. 2020

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Hydrogen peroxide (H2O2) has exhibited huge application value in many fields including chemical synthesis, medicine, environmental remediation, and fuel cells. Traditional anthraquinone method for H2O2 commercial production has emerged the drawbacks of toxicity, H2 consumption and high energy input. Photocatalytic production of H2O2, which only requires water, oxygen, solar light and catalyst, is a novel and green technique, and potentially becomes one of the substitutes for anthraquinone method. Herein, we comprehensively review the research progress in the reported semiconductor catalysts, their modification strategies, as well as the related photocatalysis systems and mechanisms for the light driven H2O2 production. In detail, the photocatalysts are introduced from different families including ZnO, g-C3N4, TiO2, metal complexes, metal sulfides, Bi containing semiconductors, and carbon materials. In the meantime, their modification strategies are systematically evaluated aiming at the improvement in the structures and the photoelectrical properties of semiconductors, as well as their effective activation of molecular O2, and inhibition of H2O2 decomposition. Finally, this review is concluded with a brief summary and outlook, and the major challenges for the development of photocatalytic H2O2 production over the emerging semiconductor photocatalysts. This review is expected to provide a theoretical and understanding foundation for the development of photocatalytic H2O2 production.

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Two‐Phase System Utilizing Hydrophobic Metal–Organic Frameworks (MOFs) for Photocatalytic Synthesis of Hydrogen Peroxide

Cited by 43 publications

References 38 publications

Strongly Reducing (Diarylamino)benzene-Based Covalent Organic Framework for Metal-Free Visible Light Photocatalytic H₂O₂ Generation

Strongly Reducing (Diarylamino)benzene-Based Covalent Organic Framework for Metal-Free Visible Light Photocatalytic H₂O₂ Generation

Hydrophobic MOFs@Metal Nanoparticles@COFs for Interfacially Confined Photocatalysis with High Efficiency

Photocatalytic Production of Hydrogen Peroxide over Modified Semiconductor Materials: A Minireview

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Two‐Phase System Utilizing Hydrophobic Metal–Organic Frameworks (MOFs) for Photocatalytic Synthesis of Hydrogen Peroxide

Cited by 43 publications

References 38 publications

Strongly Reducing (Diarylamino)benzene-Based Covalent Organic Framework for Metal-Free Visible Light Photocatalytic H2O2 Generation

Strongly Reducing (Diarylamino)benzene-Based Covalent Organic Framework for Metal-Free Visible Light Photocatalytic H2O2 Generation

Hydrophobic MOFs@Metal Nanoparticles@COFs for Interfacially Confined Photocatalysis with High Efficiency

Photocatalytic Production of Hydrogen Peroxide over Modified Semiconductor Materials: A Minireview

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Strongly Reducing (Diarylamino)benzene-Based Covalent Organic Framework for Metal-Free Visible Light Photocatalytic H₂O₂ Generation

Strongly Reducing (Diarylamino)benzene-Based Covalent Organic Framework for Metal-Free Visible Light Photocatalytic H₂O₂ Generation