Carbon nanotubes incorporated Z-Scheme assembly of agbr/tio2 for photocatalytic hydrogen production under visible light irradiations

Nasir Shezad, Ibrahim M. Maafa, Khairiraihanna Johari, Ainy Hafeez, Parveen Akhter, Maira Shabir, Ali Raza, Hirra Anjum, Murid Hussain, Muhammad Tahir

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Photocatalytic H2 production is a promising strategy toward green energy and alternative to carbon-based fuels which are the root cause of global warming and pollution. In this study, carbon nanotubes (CNTs) incorporated Z-scheme assembly of AgBr/TiO2 was developed for photocatalytic H2 production under visible light irradiations. Synthesized photocatalysts were characterized through transmission electron microscope (TEM), X-ray photoelectron spectra (XPS), X-ray diffractometer (XRD), Fourier transform infrared (FTIR), photoluminescence spectra (PL), Brunauer Emmet-Teller(BET), and UV-vis spectroscopy analysis techniques. The composite photocatalysts exhibited a H2 production of 477 ppm which was three-folds higher than that produced by TiO2. The good performance was attributed to the strong interaction of three components and the reduced charge recombination, which was 89 and 56.3 times lower than the TiO2 and AgBr/TiO2. Furthermore, the role of surface acidic and basic groups was assessed and the photocatalytic results demonstrated the importance of surface functional groups. In addition, the composites exhibited stability and reusability for five consecutive cycles of reaction. Thus, improved performance of the photocatalyst was credited to the CNTs as an electron mediator, surface functional groups, higher surface area, enhanced charge separation and extended visible light absorption edge. This work provides new development of Z-scheme photocatalysts for sustainable H2 production.

Original languageEnglish
Article number1767
JournalNanomaterials
Volume9
Issue number12
DOIs
Publication statusPublished - Dec 2019
Externally publishedYes

Keywords

  • Carbon nanotubes
  • Hydrogen production
  • Silver bromide
  • Solid-state electron mediator
  • Titanium dioxide
  • Z-scheme photocatalyst

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Materials Science

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