ZnO/COF S-scheme heterojunction for improved photocatalytic H2O2 production performance

Dynamics of Photogenerated Charge Carriers in Inorganic/Organic S-Scheme Heterojunctions

“…The S-scheme mechanism was illustrated by the charge transfer directions deduced from in situ irradiated X-ray spectroscopy (ISI-XPS) and enhanced redox abilities based on electron spin resonance (ESR) results. Later, the existence of S-scheme heterojunctions in ZnO/PDA and g-C 3 N 4 /PDA photocatalysts was also testified. , However, since the IEF within an S-scheme heterojunction is induced by charge redistribution, it is not constant and changes dynamically with the motion of electrons. In addition, the electron accepting and donating nature of PDA may further complicate electron activity, especially when it performs a charge–discharge process as an electron reservoir.…”

Fast charge transfer kinetics in an inorganic–organic S-scheme heterojunction photocatalyst for cooperative hydrogen evolution and furfuryl alcohol upgrading

“…34 Under light irradiation, the photogenerated electrons from the CB of Tp-Tta COF would largely recombine with holes in the VB of ZnIn 2 S 4 , driven by the influences of internal electric field, band edge bending and coulombic interaction. 18 Simultaneously, the photogenerated electrons of ZnIn 2 S 4 and the photogenerated holes of Tp-Tta COF are maintained with high redox capacity, which can greatly improve the reaction kinetics for photocatalytic H 2 evolution and furfuryl alcohol oxidation.…”

“…The emerging step-scheme (S-scheme) heterojunction system can simultaneously provide photogenerated electrons and holes with superior redox potentials, exhibiting great application potential in cooperatively realizing photocatalytic overall redox reactions. 18,19 Composed of a reduction and an oxidation photocatalyst with appropriate band alignments, the S-scheme heterojunction composite can be driven by visiblelight to acquire photogenerated charges with the highest redox potentials due to the S-scheme pathway of the recombination of invalid carriers. 20 Moreover, the existence of an interfacial built-in electric eld (IEF) at the interface of the Sscheme heterojunction is the key factor promoting photogenerated charge separation and transfer.…”

Enhanced photocatalytic hydrogen peroxide production activity of imine-linked covalent organic frameworksviamodification with functional groups

“…Previous studies reported conjugated π-electrons and rich active sites of imine (CN) with good light absorption and photocatalytic properties. 4,24 TAPB-PDA-X photoactivities were evaluated by photocatalytic H 2 O 2 production within simulated sunlight irradiation. The experimental results show that the electronic group greatly affected the light absorption and photogenerated charge separation ability of the TAPB-PDA-X.…”