Supercritical CO2 produces the visible-light-responsive TiO2/COF heterojunction with enhanced electron-hole separation for high-performance hydrogen evolution

Liu, Lifei; Zhang, Jianling; Tan, Xiuniang; Zhang, Bingxing; Shi, Jinbiao; Cheng, Xiuyan; Tan, Dongxing; Han, Buxing; Zheng, Lirong; Zhang, Fanyu

doi:10.1007/s12274-020-2728-6

Cited by 38 publications

(32 citation statements)

References 42 publications

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“…Furthermore, a couple of examples regarding OIH materials based on COFs appeared last year in the literature. Wang et al [139,140] described an easy and effective impregnation combined with a photodeposition method to deposit the nanoparticles of cadmium sulfide (CdS) on CTF-1, a CTF, shown in Figure 8c,d. In this hybrid, CTF-1 acted as supporter and at the same time as photocatalyst and electron donor.…”

Section: Hybrids Based On Cpps or Cofs For Hermentioning

confidence: 99%

Conjugated Porous Polymers: Ground‐Breaking Materials for Solar Energy Conversion

Barawi

Collado

Gomez‐Mendoza

et al. 2021

Advanced Energy Materials

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poor applicability for movable applications. Therefore, the development of new technologies to store renewable energy is really important to achieve the transition to a greener energy system. [3] Although new battery technologies will likely meet the need for cost-effective energy storage (1-3 days) for short time scales, fuels are the only effective option for longerterm, seasonal storage, and long-distance transportation applications. [4] Collecting and loading solar energy into electric power and more interestingly directly into valuable chemicals and fuels, as nature does through photosynthesis, is a highly desirable approach to solve this challenge. Since Honda and Fujishima [5] discovered the possibility to emulate this natural phenomenon using TiO 2 as photocatalyst more than 40 years ago, the scientific community has been trying to overcome the challenges hindering the commercialization of water splitting and CO 2 reduction. [6,7] During the past years, a large variety of systems have been proposed to drive the so-called artificial photosynthesis (AP), most of them based on inorganic semiconductors (ISs), usually metal oxides and metal chalcogenides. IS are able to absorb part of the solar spectrum and promote charge separation into electron and holes. In fact, there is a lot of recent work in the literature reviewing the use of ISs as photoabsorbers in photocatalytic, photoelectrochemical (PEC), and photovoltaic (PV) systems. [8,9] The achievements and improvements performed in this area have been always enormous. In this sense, among the huge number of materials explored, TiO 2 has been by far the most investigated until now due to its unique properties: high photoactivity and chemical stability, availability, and nontoxicity. [10,11] However, some ISs, and TiO 2 in particular, present well-known shortcomings in terms of low light absorption in the visible part of solar spectrum and fast charge recombination that limits electron donor-acceptor process. Therefore, the energy conversion efficiency achieved until now is still low. The improvement of this efficiency relies on the use of new materials that are able to harvest solar light and active toward CO 2 /N 2 reduction and water splitting. The most successful strategies to improve the photocatalyst performance so far have been: i) the modification of the optoelectronic properties of TiO 2 or other ISs, [12] ii) the use of organic materials as semiconductors, Solar energy conversion plays a very important role in the transition to a more sustainable energy system. In this sense, so many systems have been proposed to drive artificial photosynthesis, most of them based on inorganic semiconductors, and the achievements performed continue every day. However, most of these systems present well-known shortcomings as low light absorption, fast charge recombination, and lack of tunability, thus limiting their efficiency. The use of organic polymers in general and conjugated porous polymers (CPPs) in particular, opens the door to a multitude of new possibilities...

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Section: Hybrids Based On Cpps or Cofs For Hermentioning

confidence: 99%

Conjugated Porous Polymers: Ground‐Breaking Materials for Solar Energy Conversion

Barawi

Collado

Gomez‐Mendoza

et al. 2021

Advanced Energy Materials

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“…Catalysis is one of the earliest explored fields of the application of MOFs and COFs with large surface area, varieties of structures, tunable functional sites and high porosity [125][126][127][128][129]. When MOFs and COFs transform into corresponding nanosheets, they not only retain plane pore structure, but also expose abundant active sites on their surface, thus showing promising future in catalysis [130][131][132][133].…”

Section: Mof and Cof Nanosheets For Catalysismentioning

confidence: 99%

Emerging porous nanosheets: From fundamental synthesis to promising applications

et al. 2020

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Metal-organic framework (MOF) nanosheets and covalent organic framework (COF) nanosheets as emerging porous materials nanosheets have captured increasing attention owing to their attractive properties originating from the advantages of large lateral size, ultrathin thickness, tailorable physiochemical environment, flexibility and highly accessible active sites on surface, and the applications of them have been explored in a wide range of fields. Although MOF and COF nanosheets own many similar properties, their applications in various fields show significant differences, probably due to their different compositions and bonding modes. Hence, we summarize the recent progress of MOF and COF nanosheets by comparative analysis on their advantages and limitations in synthesis and applications, providing a more profound and full-scale perspective for researchers or beginners to understand this field. Herein, the categories of preparation methods of MOF and COF nanosheets are firstly discussed, including top-down and bottom-up methods. Secondly, the applications of MOF and COF nanosheets for separation, catalysis, sensing and energy storage are summarized. Finally, based on current achievements, we put forward our personal insights into the challenges and outlooks on the synthesis, characterizations, and promising applications for future research of MOF and COF nanosheets. KEYWORDS metal-organic framework (MOF) nanosheets, covalent organic framework (COF) nanosheets, top-down methods, bottom-up methods, two-dimensional (2D) nanomaterials

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“…Liu et al. reported improved kinetics of H 2 evolution reaction catalyzed by a TiO 2 /COF heterojunction …”

Section: Introductionmentioning

confidence: 99%

“…33 Liu et al reported improved kinetics of H 2 evolution reaction catalyzed by a TiO 2 /COF heterojunction. 34 The goal of this study is to develop a new method for DA detection with heterostructures constructed with organic and inorganic semiconductors. TiO 2 NTA was modified using nonsubstituted COFs (H-COF) and fluoro-substituted COFs (F-COF) in order to enhance visible light absorption and extend the lifetime of photogenerated carriers.…”

Section: ■ Introductionmentioning

confidence: 99%

Fluoro-Substituted Covalent Organic Framework Particles Anchored on TiO₂ Nanotube Arrays for Photoelectrochemical Determination of Dopamine

Wang

Liu

et al. 2021

ACS Appl. Nano Mater.

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In this work, the photoelectrochemical (PEC) properties of TiO2 nanotube arrays (NTAs) were enhanced by forming heterostructures with non-substituted covalent organic frameworks (H-COFs) and fluoro-substituted covalent organic frameworks (F-COFs) through a facile in situ hydrothermal synthesis method. The composites H-COF/TiO2 NTA and F-COF/TiO2 NTA were fully characterized using scanning electron microscopy, energy-dispersive spectrometry, transmission electron microscopy, X-ray diffraction, attenuated total reflection–Fourier transform infrared, 13C CP/MAS NMR, and X-ray photoelectron spectroscopy. It was observed via UV–vis diffuse reflection spectroscopy that both H-COF/TiO2 NTA and F-COF/TiO2 NTA exhibited enhanced visible light absorption compared to bare TiO2. The modification of TiO2 with fluoro-substituted COF was found to be the most effective in enhancing the photoelectric response of TiO2 by producing photoelectrons with the longest lifetime based on the calculation of transient time constant (τ). The potential application of F-COF/TiO2 NTA as a PEC sensor for dopamine (DA) detection was investigated, and the resultant sensor exhibited an extended linear range for DA quantification (0.1–300 μM) with a detection limit of 0.032 μM (S/N = 3). The formation of a type II heterojunction was proposed to be responsible for the “signal on” mode for DA quantification using F-COF/TiO2 NTA.

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Supercritical CO2 produces the visible-light-responsive TiO2/COF heterojunction with enhanced electron-hole separation for high-performance hydrogen evolution

Cited by 38 publications

References 42 publications

Conjugated Porous Polymers: Ground‐Breaking Materials for Solar Energy Conversion

Conjugated Porous Polymers: Ground‐Breaking Materials for Solar Energy Conversion

Emerging porous nanosheets: From fundamental synthesis to promising applications

Fluoro-Substituted Covalent Organic Framework Particles Anchored on TiO₂ Nanotube Arrays for Photoelectrochemical Determination of Dopamine

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Supercritical CO2 produces the visible-light-responsive TiO2/COF heterojunction with enhanced electron-hole separation for high-performance hydrogen evolution

Cited by 38 publications

References 42 publications

Conjugated Porous Polymers: Ground‐Breaking Materials for Solar Energy Conversion

Conjugated Porous Polymers: Ground‐Breaking Materials for Solar Energy Conversion

Emerging porous nanosheets: From fundamental synthesis to promising applications

Fluoro-Substituted Covalent Organic Framework Particles Anchored on TiO2 Nanotube Arrays for Photoelectrochemical Determination of Dopamine

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Product

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Fluoro-Substituted Covalent Organic Framework Particles Anchored on TiO₂ Nanotube Arrays for Photoelectrochemical Determination of Dopamine