4.7 Article

Mxene-TiO2 composite with exposed {101} facets for the improved photocatalytic hydrogen evolution activity

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 896, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.163039

Keywords

MXeneTi(3)C(2); TiO2; Oleylamine; Composite; Two-phase assembling

Funding

  1. National Natural Science Foundation of China [21978054, 21776049]
  2. Natural Science Foundation of Guangdong Province [2018A030313174]
  3. Maoming Technology Project [2019C002004]

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In this study, Ti3C2-TiO2 composite materials with good control of size and morphology were successfully prepared via a simple method, leading to significantly enhanced photocatalytic hydrogen evolution activity. The improved H-2 production rate of the Ti3C2-TiO2 composites can be attributed to the facet control and extended light absorption effect of TiO2 nanoparticles.
Fabricating Ti3C2Tx Mxene based composite with good control of size, morphology and facet for the high efficiency photocatalytic application is of great potential and highly challenging. In this work, Ti3C2-TiO2 composite are prepared by a simple two-phase assembling method from the Ti3C2 Mxene dispersion modified with tetraethyl hydroxyl ammonium (TEHA) and rhombic-shaped TiO2 nanoparticles with exposed {101} facets. The Ti3C2 Mxene acts as a good support to anchor TiO2 nanoparticles of 15 nm with good facet control. A significantly enhanced photocatalytic hydrogen evolution activity is acquired by the Ti3C2-TiO2 composites. The highest H-2 production rate of 390.92 mu mol h(-1) is gained by the Ti3C2-TiO2 composites with the Ti3C2 weight percentage of 6.7%, which is 2.1 times that of pristine TiO2. The excellent photocatalytic activity can be attributed to the extended light absorption, the boost charge separation efficiency and exposed {101} facets in the TiO2 nanoparticles. This work provides a new strategy to prepare high quality MXene Ti3C2-TiO2 hybrids with good photocatalytic properties, which could be widely applied to produce other MXene-based composites with excellent properties. (C) 2021 Elsevier B.V. All rights reserved.

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