Covalent-organic framework based Z-scheme heterostructured noble-metal-free photocatalysts for visible-light-driven hydrogen evolution

Zhang, Yang-Peng; Tang, Hongliang; Dong, Hong; Gao, Meng-Yao; Li, Changcheng; Sun, Xiaojun; Wei, Jin‐Zhi; Qu, Yang; Li, Zhijun; Zhang, Fengming

doi:10.1039/c9ta12870k

Cited by 103 publications

(70 citation statements)

References 56 publications

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“…In addition to the previous examples, the 2D/2D Z‐scheme heterojunction was also reported for MnIn 2 S 4 /g‐C 3 N 4 , [ 140 ] BiVO 4 /g‐C 3 N 4 , [ 141 ] Cu 2 S/Zn 0.67 Cd 0.33 S, [ 142 ] g‐C 3 N 4 /C‐doped BN, [ 143 ] CdS/r‐GO/WO 3 , [ 144 ] ZnO/Zn x Cd 1– x S, [ 145 ] α‐Fe 2 O 3 /TpPa‐2‐COF, [ 146 ] and La 2 Ti 2 O 7 /g‐C 3 N 4 . [ 147 ] In all these cases, the Z‐scheme heterojunctions exhibited superior and enhanced photocatalytic H 2 production activities.…”

Section: Advances In 2d/2d Z‐scheme Heterojunctions For Photocatalytimentioning

confidence: 99%

Advances in 2D/2D Z‐Scheme Heterojunctions for Photocatalytic Applications

2020

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Semiconductor‐based photocatalysis technology has attracted widespread attention due to its great potential for solving both energy and environmental problems through direct utilization of inexhaustible solar energy. Among various photocatalysts, 2D/2D Z‐scheme heterojunctions exhibit superior performance in various photocatalytic applications, due to their large interfacial contact and rapid Z‐scheme charge transfer with the efficient separation of photogenerated charge carriers and maximized redox ability. In this review, the historical development of, requirements for the formation of, and identification methods of Z‐scheme heterojunctions are first introduced, followed by the summary of important advantages of 2D materials and 2D/2D heterojunctions in photocatalysis. Subsequently, a special focus is put on the recent advances of 2D/2D Z‐scheme heterojunctions for photocatalytic applications, including photocatalytic H2 production, CO2 reduction, and degradation of pollutants. Finally, a brief summary and perspectives on the challenges and future research topics of 2D/2D Z‐scheme heterojunction photocatalysts are presented.

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Section: Advances In 2d/2d Z‐scheme Heterojunctions For Photocatalytimentioning

confidence: 99%

Advances in 2D/2D Z‐Scheme Heterojunctions for Photocatalytic Applications

2020

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“…In addition, two very interesting systems that do not need a Pt co-catalyst to be significantly active emerge from the combination of hexagonal hematite (α-Fe 2 O 3 ) nanosheets on top of the honeycomb-like β-ketoenamine linked TpPa-2-COF generated from reaction of TP with 2,5-dimethyl-p-phenylenediamine (Pa-2) (Figure 3) [52], rendering 3.8 mmol H 2 •g −1 •h −1 ; and from the in situ growth of the TpPa-1-COF in exfoliated MoS 2 , generating a hybrid system where MoS 2 is deposited on top of the TpPa-1-COF [53]. Other possibilities include the deposition of CdS NPs on top COFs, such as the TpPa-2-COF [54] or the CTF-1-COF [55]; and the use of TiO 2 nanosheets functionalized with 3-aminopropyltriethoxysilane (APTES) to chemically bind TpPa-1-COF onto its surface by imine bond formation [56], yielding 11.2 mmol H 2 •g −1 •h −1 and an AQE of 7.6% at 420 nm in the presence of Pt.…”

Section: Heterojunctions and Encapsulation Of Cofs With Other Materialsmentioning

confidence: 99%

Light-Driven Hydrogen Evolution Assisted by Covalent Organic Frameworks

et al. 2021

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Covalent organic frameworks (COFs) are crystalline porous organic polymers built from covalent organic blocks that can be photochemically active when incorporating organic semiconducting units, such as triazine rings or diacetylene bridges. The bandgap, charge separation capacity, porosity, wettability, and chemical stability of COFs can be tuned by properly choosing their constitutive building blocks, by extension of conjugation, by adjustment of the size and crystallinity of the pores, and by synthetic post-functionalization. This review focuses on the recent uses of COFs as photoactive platforms for the hydrogen evolution reaction (HER), in which usually metal nanoparticles (NPs) or metallic compounds (generally Pt-based) act as co-catalysts. The most promising COF-based photocatalytic HER systems will be discussed, and special emphasis will be placed on rationalizing their structure and light-harvesting properties in relation to their catalytic activity and stability under turnover conditions. Finally, the aspects that need to be improved in the coming years will be discussed, such as the degree of dispersibility in water, the global photocatalytic efficiency, and the robustness and stability of the hybrid systems, putting emphasis on both the COF and the metal co-catalyst.

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“…For instance, α‐Fe 2 O 3 /TpPa‐2‐COF (the weight ratio of α‐Fe 2 O 3 : TpPa‐2‐COF = 3:7), CdS‐COF (the weight ratio of CdS: COF = 90:10) exhibit high catalytic activities without noble metal co‐catalysts, showing a H 2 production rate of 3770 and 3678 μmol g −1 h −1 , respectively. [ 93,94 ] Moreover, the H 2 production rate of TiO 2 ‐TpPa‐1‐COF (the weight ratio of TiO 2 :TpPa‐1‐COF = 1:3) could reach 11 190 μmol g −1 h −1 in the presence of Pt NPs. [ 95 ] Interestingly, the TpPa‐1‐COF also can composite with MOF (NH 2 ‐UiO‐66) that could facilitate separation and migration of photo‐generated electrons/holes ( Figure ).…”

Section: Photocatalytic Applications Of 2d Cofmentioning

confidence: 99%

Two‐Dimensional Covalent‐Organic Frameworks for Photocatalysis: The Critical Roles of Building Block and Linkage

et al. 2020

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Covalent organic frameworks (COFs) are a class of crystalline porous materials which contain organic build blocks linked via covalent bonds to form ordered and periodic structures. In recent years, 2D COFs have been developed as promising heterogeneous photocatalysts due to their extended π‐conjugated skeletons, high surface area, tunable structure, regular pore structure, and high crystallinity. Herein, recent advances in the design and synthesis of 2D COFs for photocatalysts are surveyed, the illustration of the structural features and synthetic strategy is focused on, and the relationship between the construction and property of 2D COFs for photocatalytic water splitting, CO2 reduction, organic transformation, and degradation of organic pollutants is elucidated. This overview is expected to provide clues to rational design and synthesis of ultra‐stable, high crystalline, and high‐performance 2D COFs for photocatalytic applications.

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Covalent-organic framework based Z-scheme heterostructured noble-metal-free photocatalysts for visible-light-driven hydrogen evolution

Abstract: A COF-based Z-scheme heterostructure hybrids (α-Fe2O3/TpPa-2-COF) for noble-metal-free photocatalytic hydrogen evolution.

Cited by 103 publications

References 56 publications

Advances in 2D/2D Z‐Scheme Heterojunctions for Photocatalytic Applications

Advances in 2D/2D Z‐Scheme Heterojunctions for Photocatalytic Applications

Light-Driven Hydrogen Evolution Assisted by Covalent Organic Frameworks

Two‐Dimensional Covalent‐Organic Frameworks for Photocatalysis: The Critical Roles of Building Block and Linkage

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