Boosting photocatalytic hydrogen evolution of β-keto-enamine-based covalent organic frameworks by introducing electron-donating functional substituents

Recent developments, advances and strategies in heterogeneous photocatalysts for water splitting

“…Multiple studies are being conducted on catalysts based on COFs for the purpose of H 2 /O 2 evolution. [396][397][398] These studies include the development and regulation of the organic framework. Incorporating electron donor/acceptor ligands with COFs is a useful method for enhancing charge isolation and transmission in COFs.…”

Recent advances on covalent organic frameworks (COFs) as photocatalysts: different strategies for enhancing hydrogen generation

“…Hence, strong electron-absorbing groups (like halogen atoms, heteroatomic atoms) and electron-donating groups (like methyl, methoxy) are often adopted to modify COF structures to boost photocatalytic HER. [69][70][71][72][73][74][75][76][77][78][79][80] Halogen atoms as typical electron-absorbing groups exhibit good electronegativity, which can regulate the localized electron cloud density and delocalization of conjugated building blocks and promote the separation transfer of electrons to enhance HER ability. Chen et al selected a benzothiadiazole (BT) acceptor as a qualifiable building block to fabricate Py-XTP-BT-COFs (X = H, F, Cl) via chlorination and fluorination (Fig.…”

“…Hence, strong electron-absorbing groups (like halogen atoms, heteroatomic atoms) and electron-donating groups (like methyl, methoxy) are often adopted to modify COF structures to boost photocatalytic HER. 69–80…”

Efficient photocatalytic hydrogen production by organic–inorganic heterojunction structure in Chl@Cu2O/Ti3C2Tx

“…[4][5][6][7] In recent decades, solar-driven photocatalytic hydrogen evolution reaction (HER) with water splitting technology for the production of hydrogen fuel has been widely explored as an ideal way to obtain hydrogen energy to replace traditional fossil energy sources, which is primarily due to the fact that solar energy and water are theoretically inexhaustible, and the burning product of hydrogen energy is water, which does not have any environmental polluting properties. [8][9][10][11][12][13][14][15] However, traditional photocatalysts such as TiO 2 and CdS have various drawbacks, such as serious lack of visible light absorption capacity, obviously lower photogenerated carrier mobility than electron-hole pair recombination during the photocatalytic HER, toxicity that can be hazardous to human health and pollute the environment, etc., which have greatly limited the development and practical application of solar-driven photocatalytic hydrogen production. 16,17 Therefore, it is necessary to explore a new type of low cost, environmentally friendly photocatalytic material with excellent structural properties, high visible light absorption capacity and excellent photogenerated charge separation performance, for the practical application of solar energy conversion to hydrogen production.…”