Covalent organic frameworks: Fundamentals, mechanisms, modification, and applications in photocatalysis

Liang, Zizhan; Shen, Rongchen; Ng, Yun Hau; Yang, Fu; Ma, Tianyi; Zhang, Peng; Li, Youji; Li, Xin

doi:10.1016/j.checat.2022.06.006

Cited by 58 publications

(38 citation statements)

References 144 publications

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“…Besides, this indicates the successful construction of the two COFs. Also, the solid-state CP/MAS 13 C NMR spectrum verified the presence of imine C at 157 ppm and the Tz moiety C at 151 ppm as well as the other aromatic carbon atoms in the range of 136-119 ppm (Fig. 2b).…”

Section: Resultsmentioning

confidence: 78%

“…2c). Further analysis of the structure and chemical composition of the as-prepared COFs was performed using Fourier transform infrared (FTIR) and solid-state 13 C NMR spectroscopy. 33 As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…12 Therefore, researchers hope to explore some structure-activity relationships of COFs and then guide the design and synthesis of subsequent COFs. 13 At present, in order to improve the separation of photogenerated carriers on the COF surface, increase the migration speed of electrons and shorten the migration distance of carriers, researchers have proposed methods such as constructing D (donor)-A (acceptor) structures and modifying the monomer structure. [14][15][16] These strategies mainly use the push-pull effect of electrons to control the separation of photogenerated carriers.…”

Section: Introductionmentioning

confidence: 99%

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Identifying the roles of imine and alkyne linkages in determining the photocatalytic hydrogen evolution over thiadiazole-based covalent organic frameworks

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identifying the roles of imine and alkyne linkages in determining the photocatalytic hydrogen evolution over thiadiazole-based covalent organic frameworks

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“…For the purpose of evaluating the photochemical stability of BiOBr/BiOI/Bi in the photocatalytic nitrogen fixation process, [ 40 ] the nitrogen reduction cycle experiments are performed. After eight photocatalytic tests, the N 2 photofixation activity of BiOBr/BiOI/Bi remains basically unchanged ( Figure a), indicating that it has good N 2 photofixation stability.…”

Section: Resultsmentioning

confidence: 99%

Boosting Photocatalytic Nitrogen Fixation via In Situ Constructing Bi Metal Active Sites over BiOBr/BiOI Heterojunction

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The main obstacles to the photocatalytic reduction of nitrogen are the low separation efficiency of photogenerated charges and the few activation sites for nitrogen. It is highly desirable to explore new strategies for improving the nitrogen fixation performance of catalysts. Herein, the Bi metal active sites are constructed on the surface of BiOBr/BiOI heterojunction by in situ reaction, which promote the absorption, activation, and dissociation of nitrogen molecules. Moreover, the existence of Bi metal and BiOBr/BiOI heterojunction enhances the light absorption ability and facilitates the separation and transfer of photogenerated charges. The theoretical calculation also demonstrates that the BiOBr/BiOI/Bi composite has excellent electron structure and electron transfer efficiency. So, the ternary BiOBr/BiOI/Bi catalyst shows excellent performance of photocatalytic reduction of nitrogen to ammonia. The nitrogen reduction rate is 221.9 μmol g−1 h−1, which is 7.6 and 5 times higher than that of pure BiOBr and BiOBr/BiOI. The mechanism of photocatalytic nitrogen fixation of the BiOBr/BiOI/Bi is proposed based on the experimental and theoretical results. This study provides a novel method for improving the photocatalytic nitrogen reduction performance of catalysts.

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“…Constructing highly intrinsically polarized electric elds is oen used to enhance exciton dissociation because of the intrinsic electron push-pull effect. [7][8][9][10] The electric eld polarization properties of copolymers are critical for exciton dissociation and chargecarrier migration, which is crucial in PHE. 11 However, designing and synthesizing novel linear organic copolymers with low cost and high activity and elucidating the exact active centers remain challenging.…”

Section: Introductionmentioning

confidence: 99%

Boosting exciton dissociation and charge separation in pyrene-based linear conjugated polymers for efficient photocatalytic hydrogen production

et al. 2022

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Covalent organic frameworks: Fundamentals, mechanisms, modification, and applications in photocatalysis

Cited by 58 publications

References 144 publications

Identifying the roles of imine and alkyne linkages in determining the photocatalytic hydrogen evolution over thiadiazole-based covalent organic frameworks

Identifying the roles of imine and alkyne linkages in determining the photocatalytic hydrogen evolution over thiadiazole-based covalent organic frameworks

Boosting Photocatalytic Nitrogen Fixation via In Situ Constructing Bi Metal Active Sites over BiOBr/BiOI Heterojunction

Boosting exciton dissociation and charge separation in pyrene-based linear conjugated polymers for efficient photocatalytic hydrogen production

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