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Stoichiometrically Optimized Electrochromic Complex [V2O2+ξ(OH)3-ξ] Based Electrode: Prototype Supercapacitor with

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Summary

Stoichiometrically tuned porous vanadium oxide demonstrates enhanced electrochromic supercapacitor performance. This optimization offers high energy density, power density, and color-modulating capabilities for practical applications.

Keywords:
electrochromic supercapacitorprototype devicestoichiometrysurface modificationvanadium oxide

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Systematic structure modification of metal oxides is crucial for advanced energy storage and color-modulating applications.
  • Developing effective strategies for structural tuning is highly desirable for improving material performance.

Purpose of the Study:

  • To demonstrate the multifunctional capabilities of a stoichiometrically tuned porous vanadium oxide-hydroxide complex for electrochromic supercapacitors.
  • To investigate the impact of stoichiometry on the electrochemical and electrochromic properties of vanadium oxide-based materials.

Main Methods:

  • Synthesis of a porous vanadium oxide-hydroxide complex, [V2O2+ξ(OH)3-ξ], using a wet chemical etching technique.
  • Optimization of stoichiometry (ξ = 0) to maximize electroactive surface sites.
  • Fabrication and testing of a solid-state symmetric electrochromic supercapacitor device.

Main Results:

  • The optimized electrode ([V2O2+ξ(OH)3-ξ] with ξ = 0) exhibited a high charge storage capacity of 610 Fg⁻¹ at 1A g⁻¹.
  • Excellent electrochromic properties were observed, including high color contrast (70% and 50% at 428 and 640 nm), fast switching, and high coloration efficiency.
  • The assembled supercapacitor device achieved ultrahigh power density (1066 mWcm⁻²), high energy density (246 mWhcm⁻²), and specific capacitance (290 mFcm⁻² at 0.2 mAcm⁻²).
  • A prototype device demonstrated distinct color changes (red, green, blue) corresponding to different charge states.

Conclusions:

  • Stoichiometric tuning is an effective strategy for optimizing the multifunctional performance of electrochromic supercapacitors.
  • The developed vanadium oxide-hydroxide material shows significant promise for advanced energy storage and display applications.
  • Demonstration of a large-area (25 cm²) device prototype highlights potential for real-world implementation.