writer：Wang, YY (Wang, Yanyun) [1] ; Fang, H (Fang, Hao) [1] ; Liang, S (Liang, Shuang) [2] ; Sheng, XL (Sh
keywords：Metal-organic frameworksElectron-withdrawing effectQuantum dotsBuilt-in electric fieldPhotocatalytic hydrogen evolution
source：期刊
Issue time：2022年
The construction of heterojunctions with a rapid space charge separation mechanism is an effective means to improve the photocatalytic activity. In this work, QDs/NH2-MIL-101(Fe)-AP photocatalyst equipped with built-in electric field was rationally prepared by a molecular modification strategy. Electron-withdrawing effect of the pyridine ring facilitates the directional transfer of electrons from the internal part of NH2-MIL-101(Fe) to the heterojunction interface. Meanwhile, the electron self-driven effect incidental to the suitable conduction band positions of QDs and NH2-MIL-101(Fe)-AP, and the co-driving effect of electron transfer exerted by hydrogen bonding accelerate the electron enrichment in the conduction band of NH2-MIL-101(Fe)-AP. The photocatalytic hydrogen evolution results showed that QDs/NH2-MIL-101(Fe)-AP reached an optimum rate of 2991.0 mu mol h(-1) g(-1). Moreover, fluorescence and electrochemical tests revealed that the significant increase in photocatalytic activity is attributed to the efficient spatial separation of the photoinduced charge carriers.