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Solution Processing of Topochemically Converted Layered WO3 for Multifunctional Applications.

Priyabrata Sahoo1,2, Bikesh Gupta1, Ramesh Chandra Sahoo1,2

  • 1Energy Materials Laboratory, Centre for Nano and Soft Matter Sciences (CeNS), Arkavathi Campus, Survey No.7, Shivanapura, Dasanapura Hobli, Bangalore, 562162, India.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 21, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a method to create layered tungsten oxide (WO3) from tungsten disulfide (WS2). This enables solution processing for applications like supercapacitors and photoanodes.

Keywords:
liquid-phase exfoliationphoto-electrochemical water oxidationsupercapacitorstopochemical synthesistungsten oxide

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Solution processing of nanomaterials offers simplicity and scalability for diverse applications.
  • Liquid-phase exfoliation (LPE) studies of tungsten oxide (WO3) are limited due to the unavailability of bulk layered WO3.

Purpose of the Study:

  • To develop a one-step topochemical synthesis for bulk layered WO3 from commercially available tungsten disulfide (WS2).
  • To investigate the liquid-phase exfoliation of the synthesized WO3 and identify optimal solvent systems.
  • To fabricate thin films from WO3 dispersions for energy storage and photoelectrochemical applications.

Main Methods:

  • One-step topochemical synthesis of layered WO3 from WS2, optimizing reaction time and temperature.
  • Liquid-phase exfoliation (LPE) of synthesized WO3 in 22 different solvents, identifying propan-2-ol/water (1:1) as optimal.
  • Fabrication of WO3 thin films via spray coating and characterization for supercapacitor and photoanode performance.

Main Results:

  • Successful synthesis of bulk layered WO3 from WS2 confirmed by microscopic and spectroscopic techniques.
  • Identification of propan-2-ol/water (1:1) as the best solvent system for WO3 exfoliation, suggesting optimal surface tension and Hansen solubility parameters.
  • WO3 thin films exhibited an areal capacitance of 31.7 mF/cm² in supercapacitors and demonstrated potential as photoanodes for water oxidation.

Conclusions:

  • A scalable method for producing bulk layered WO3 suitable for solution processing has been established.
  • The developed WO3 dispersions and thin films show promise for advanced energy storage and photocatalytic applications.
  • This work overcomes limitations in WO3 exfoliation, opening new avenues for its utilization in nanotechnology.