Enhanced photocatalytic H₂ evolution over covalent organic frameworks through an assembled NiS cocatalyst.

ABSTRACT: Covalent organic frameworks (COFs) have been investigated in the field of photocatalysts for H₂ evolution because of their crystalline structure and diversity. However, most of them need the help of noble metals as co-catalysts to realize a high hydrogen evolution. Herein, we chose typical COFs as a platform and constructed NiSX-BD (X: weight fraction of NiS) composites by assembling NiS at room temperature. The NiS nanoparticles are shown to tightly adhere to the COFs surface. Under visible light irradiation (wavelength > 420 nm), the optimized sample with 3 wt% NiS loading exhibits a photocatalytic H₂ evolution rate of 38.4 μmol h^-1 (3840 μmol h^-1 g^-1), which is about 120 folds higher than that of the pure TpBD-COF and

SUBMITTER: Zhang H 

PROVIDER: S-EPMC9115773 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature