Metal–organic framework heterojunctions for photocatalysis

Abstract

The present review summarizes the current state-of-the-art in MOF-based heterojunctions in three important photocatalytic processes: hydrogen evolution reaction, CO2 photoreduction and photodegradation of dyes.

Recent progress in atomically precise metal nanoclusters for photocatalytic application

“…Photocatalytic water splitting technology can use ready-made solar energy to produce hydrogen from water and has been considered as a clean and environment-friendly hydrogen production method. 24–29 Generally, photocatalytic water splitting includes three main steps: firstly, the formation of photogenerated electron–hole pairs, secondly, the separation and migration of the generated electron and hole, finally, the participation in water splitting to produce H 2 and O 2 . From the aspect of thermodynamics, the energy position of the conduction band (CB) and valence band (VB) of the photocatalyst is required to be more negative and positive than that of H + /H 2 (0 V vs. NHE) and O 2 /H 2 O (1.23 V vs. NHE) for photocatalytic H 2 and O 2 evolution, respectively.…”

S-Scheme Nanometer-Sized Bi3NbO7/Bi2O2CO3 Heterojunction Photocatalysts for Efficient Pollutant Degradation

“…Bi 3 NbO 7 is a special octahedral structure composed of twisted [NbO 6 ] with good visible light responsiveness, and the Nb 4d energy level possesses very high energy, which can be used for the removal of antibiotics in aqueous environments, but the disadvantage of low separation of photogenerated carriers and small specific surface area restricts the photoresponse . It is revealed that constructing heterojunctions is an effective measure to promote the separation and transfer of photogenerated carriers and improve the photocatalytic performance. − The S-scheme system possesses a special charge transfer mechanism and stronger redox ability, which is conducive to improving the photocatalytic activity of the catalyst. − …”

Tunable optical properties of isoreticular UiO-67 MOFs for photocatalysis: a theoretical study

“…1,2 These materials have structural diversity and can exhibit exceptional properties such as high specific surface areas, permanent porosity, readily accessible cavities, and well-dispersed active sites, among others. 3–8 Their intrinsic hybrid organic–inorganic nature and the possibility to incorporate functional groups in the structures provide attractive photophysical properties that allow their applications as luminescence sensors 9,10 and/or photocatalysts. 6,8,11–14 Despite all these advantages, reported MOFs have been limited in several photocatalytic processes due to higher charge recombination, low yield under UV-light illumination, and limited applications under sunlight (visible light).…”