2D Metal–Organic Framework Nanosheets based on Pd‐TCPP as Photocatalysts for Highly Improved Hydrogen Evolution

Abstract

In this report, a 2D MOF nanosheet derived Pd single‐atom catalyst, denoted as Pd‐MOF, was fabricated and examined for visible light photocatalytic hydrogen evolution reaction (HER). This Pd‐MOF can provide a remarkable photocatalytic activity (a H2 production rate of 21.3 mmol/gh in the visible range), which outperforms recently reported Pt‐MOFs (with a H2 production rate of 6.6 mmol/gh) with similar noble metal loading. Notably, this high efficiency of Pd‐MOF is not due to different chemical environment of the metal center, nor by changes in the spectral light absorption. The higher performance of the Pd‐MOF in comparison to the analogue Pt‐MOF is attributed to the longer lifetime of the photogenerated electron‐hole pairs and higher charge transfer efficiency.

Decorating Cage-Shaped Cavities with Carboxyl Groups on Two-Dimensional MOF Nanosheet for Trace Uranium(VI) Trapping

“…Two-dimensional (2D) MOF nanosheets, a highly open structure with adequately exposed surfaces and active sites, may overcome the above issues. − MOF nanosheets not only inherit the structural features of bulk MOFs, including the periodic structure with predesigned adsorption sites, but also overcome the shortcomings of 3D porous materials. − The highly open structure prompts MOF nanosheets to expose more accessible active sites, which would facilitate the intimate contact and adequate interactions with pollutant molecules on the exposed surfaces, achieving enhanced adsorption kinetics and selectivities. − Nevertheless, their application was limited in the removal of aqueous contaminants, and the primary factor might be the lack of the “container” to hold pollutant molecules. As the “container” structure is beneficial for adsorption, the preenrichment of the “container” on the exposed surface is essential to achieve a high removal rate, especially in low concentrations.…”