Synthesis of hierarchical WO3 and Bi2O3/WO3 nanocomposite for solar-driven water splitting applications

Ibrahim Khan, Akram Abdalla, Ahsanulhaq Qurashi

Research output: Journal PublicationArticlepeer-review

62 Citations (Scopus)

Abstract

Tungsten tri oxide hierarchical nanostructures (h-WO3) and bismuth oxide (Bi2O3)/h-WO3 nanocomposite successfully prepared via a simple one-pot hydrothermal method. Structural properties of the materials reconnoitered by numerous characterization techniques such as FESEM, EDX, XRD, FT-IR and Raman. FESEM analysis designated that the h-WO3 made of smaller layered nanorods with four axis, while the EDX analysis confirmed the elemental composition of pristine h-WO3 and Bi2O3/h-WO3 nanocomposite respectively. The XRD patterns revealed the formation of monoclinic crystal unit of WO3 product. The as-prepared h-WO3 nanostructures and Bi2O3/h-WO3 nanocomposite displayed strong near-infrared absorption and the Raman spectrum, also indicated characteristic peaks for Bi[sbnd]O and W[sbnd]O vibrations. Based on the structural characterizations, the plausible growth mechanism for the formation of h-WO3 nanostructures proposed. The optical properties of h-WO3 and their nanocomposite studied through UV–Vis spectrometer and decrease in bandgap observed from 2.81 eV to 2.64 eV for the later. The photoelectrochemical (PEC) study indicated that h-WO3 is active under visible-light region and the Bi2O3 incorporation further ameliorated its water splitting properties.

Original languageEnglish
Pages (from-to)3431-3439
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number5
DOIs
Publication statusPublished - 2 Feb 2017
Externally publishedYes

Keywords

  • Bismuth oxide
  • Hierarchical nanostructures
  • Hydrothermal
  • Nanocomposite
  • Tungsten oxide
  • Water splitting

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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