0D/2D MXene Quantum Dot/Ni-MOF Ultrathin Nanosheets for Enhanced N2Photoreduction

Jiangzhou Qin, Baojun Liu, Kwok Ho Lam, Shijie Song, Xinyong Li, Xia Hu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

32 Citations (Scopus)

Abstract

To improve the photocatalytic efficiency of the N2 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 II 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 μmol gcat-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 N2. 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.

Original languageEnglish
Pages (from-to)17791-17799
Number of pages9
JournalACS Sustainable Chemistry and Engineering
Volume8
Issue number48
DOIs
Publication statusPublished - 7 Dec 2020

Keywords

  • MXene quantum dots
  • Ni-MOF nanosheets
  • photocatalytic Nfixation

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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