Boosting Photosynthetic H₂O₂of Polymeric Carbon Nitride by Layer Configuration Regulation and Fluoride–Potassium Double-Site Modification

Abstract

Photocatalytic hydrogen peroxide (H 2 O 2 ) production will become a burgeoning strategy for solar energy utilization by selective oxygen reduction reaction (ORR). Polymeric carbon nitride (PCN) shows relatively high two-electron ORR selectivity for H 2 O 2 production but still limited low H 2 O 2 production efficiency due to slow exciton dissociation. Herein, we constructed a heptazine/triazine layer stacked carbon nitride heterojunction with fluorine/potassium (F/K) dual sites (FKHTCN). The introduction of F/K not only can regulate layer components to enhance the charge separation efficiency but, more importantly, also optimize the adsorption of surface oxygen molecules and intermediate *OOH during H 2 O 2 production. Consequently, FKHTCN efficiently improves the photocatalytic H 2 O 2 production rate up to 3380.9 μmol h −1 g −1 , nearly 15 times higher than that of traditional PCN. Moreover, a production−utilization cascade system was designed to explore their practical application in environmental remediation. This work lays out the importance of engineering a layer-stacked configuration and active sites for enhancing photocatalysis.

Linker length-dependent hydrogen peroxide photosynthesis performance over crystalline covalent organic frameworks

“…The corresponding bandgap energy (E g ) of them was estimated by the transformed Kubelka-Munk function on the basis of the UV-vis DRS results. 44,45 As shown in Fig. 5b, the bandgaps of COF-BPDA-DTP, -BD, and -PA were 2.53, 2.45, and 2.38 eV, respectively.…”

ZnS/C Dual-Quantum-Dots Heterostructural Nanofibers for High-Performance Photocatalytic H2O2 Production

“…1,2 However, traditional approaches for H 2 O 2 production, primarily the anthraquinone method, result in significant energy consumption and generate highly toxic byproducts. 3,4 Photocatalysis, which harnesses renewable solar energy as its power source, holds immense potential as a sustainable approach to producing H 2 O 2 . 5 Nevertheless, the current efficiency of photocatalytic H 2 O 2 production remains unsatisfactory for industrial-scale applications due to limitations associated with photocatalysts.…”

“…Hydrogen peroxide (H 2 O 2 ) is extensively utilized in medicine disinfection, chemical synthesis, and environmental remediation. , However, traditional approaches for H 2 O 2 production, primarily the anthraquinone method, result in significant energy consumption and generate highly toxic byproducts. , Photocatalysis, which harnesses renewable solar energy as its power source, holds immense potential as a sustainable approach to producing H 2 O 2 . Nevertheless, the current efficiency of photocatalytic H 2 O 2 production remains unsatisfactory for industrial-scale applications due to limitations associated with photocatalysts. − Therefore, substantial research efforts have been dedicated to developing highly efficient photocatalysts for industrial-scale H 2 O 2 production.…”