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A poly(3,4-ethylenedioxypyrrole)-Au@WO3 -based electrochromic pseudocapacitor.

B Narsimha Reddy1, P Naresh Kumar, Melepurath Deepa

  • 1Department of Chemistry, Indian Institute of Technology Hyderabad, Ordnance Factory Estate, Yedduaram-502205, Telangana (India).

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Researchers developed a novel electrochromic supercapacitor electrode using poly(3,4-ethylenedioxypyrrole)-gold nanoparticle-tungsten oxide (PEDOP-Au@WO3). This hybrid material can simultaneously modulate solar energy and store/release electrical charge, paving the way for advanced sustainable devices.

Keywords:
electrochromismpoly(3,4-ethylenedioxypyrrole)pseudocapacitorssolar cellstungsten oxide

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Tungsten oxide (WO3) fibers were synthesized via a hydrothermal route.
  • Gold nanoparticles (Au) and poly(3,4-ethylenedioxypyrrole) (PEDOP) were coated onto WO3 fibers.
  • The resulting hybrid material forms a PEDOP-Au@WO3 electrochromic supercapacitor electrode.

Purpose of the Study:

  • To fabricate a novel electrochromic supercapacitor electrode with energy storage and solar energy modulation capabilities.
  • To investigate the properties and performance of the PEDOP-Au@WO3 hybrid electrode.
  • To evaluate its potential as a counter electrode in solar cells.

Main Methods:

  • Hydrothermal synthesis of WO3 fibers.
  • Electrophoretic deposition of WO3 onto a conducting substrate.
  • Coating of Au nanoparticles and PEDOP to form the hybrid electrode.
  • Characterization using X-ray diffraction, Raman spectroscopy, and energy-dispersive X-ray analysis.
  • Electrochemical performance testing including specific discharge capacitance and cycling stability.

Main Results:

  • The PEDOP-Au@WO3 hybrid electrode exhibited significantly enhanced nanoscale electronic conductivity, coloration efficiency, and transmission contrast compared to pristine WO3 and PEDOP.
  • A high specific discharge capacitance of 130 F/g was achieved during coloration, which was 4-10 times greater than that of WO3 or PEDOP alone.
  • The hybrid demonstrated superior performance as a counter electrode in solar cells due to a higher work function.
  • The electrode showed excellent cycling stability with insignificant decrease in capacitance and redox switching capability.

Conclusions:

  • The novel PEDOP-Au@WO3 hybrid electrode successfully integrates electrochromic properties with supercapacitor functionality.
  • This multifunctional material offers a promising platform for next-generation sustainable devices, including electrochromic pseudocapacitors.
  • The ability to concurrently conserve and store energy highlights its potential for efficient energy management solutions.