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Indexed by:期刊论文

Date of Publication:2021-03-05

Journal:ACS SUSTAINABLE CHEMISTRY & ENGINEERING

Volume:8

Issue:48

Page Number:17791-17799

ISSN No.:2168-0485

Key Words:MXene quantum dots; Ni-MOF nanosheets; photocatalytic N-2 fixation

Abstract:To improve the photocatalytic efficiency of the N-2 reduction reaction, MXene quantum dots (Ti3C2-QDs) and two-dimensional (2D) nickel metal-organic framework (Ni-MOF) with different ratios were fabricated by a simple self-assembly strategy to form type H heterojunctions. The resultant composites showed enhanced absorption and excellent interfacial charge-transfer capabilities according to the optical and photoelectron properties. The optimal Ti3C2-QD/Ni-MOF heterostructure exhibited a considerable ammonia yield rate (88.79 mu mol g(cat)(-1) h(-1)). By means of X-ray absorption near-edge fine structure (XANES) technique, it was found that the interaction of Ti3C2-QD and Ni-MOF could accelerate the electron transfer, and Ni site would be the main area to enrich the electron density as well as adsorb and activate N-2. Finally, with the aid of density functional theory (DFT) calculations and in situ Fourier transform infrared spectrometry (FTIR), the reaction pathway and intermediate products were studied.