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High Performance All-Solid-State Flexible Micro-Pseudocapacitor Based on Hierarchically Nanostructured Tungsten

Xuezhen Huang1, Hewei Liu1, Xi Zhang1

  • 1Materials Science Program, Department of Electrical and Computer Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.

ACS Applied Materials & Interfaces
|December 1, 2015
PubMed
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Researchers developed flexible microsupercapacitors (MSCs) using tungsten oxide (WO3) nanomaterials. These solid-state devices offer superior energy storage for portable electronics, outperforming graphene-based alternatives.

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energy storagelaser patterningmicrosupercapacitorsnanomaterialstungsten oxide

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Microsupercapacitors (MSCs) are crucial for powering miniaturized electronics.
  • There is a growing demand for high-performance, all-solid-state flexible supercapacitors.
  • Developing novel materials and fabrication methods is essential for advancing flexible MSC technology.

Purpose of the Study:

  • To demonstrate all-solid-state, flexible micropseudocapacitors using a novel composite material.
  • To investigate the performance enhancement of flexible MSCs utilizing hierarchically structured WO3 nanomaterials.
  • To explore the impact of composite composition and electrode design on device performance.

Main Methods:

  • Fabrication of flexible microsupercapacitors using direct laser patterning.
  • Utilizing crack-free, flexible composites of WO3/polyvinylidene fluoride (PVDF)/multiwalled carbon nanotubes (MWCNTs).
  • Incorporating high loadings of porous, hierarchically structured WO3 nanomaterials (up to 50 wt %).

Main Results:

  • Achieved an areal capacitance of 62.4 mF·cm(-2) and volumetric capacitance of 10.4 F·cm(-3).
  • Demonstrated performance exceeding graphene-based flexible MSCs by factors of 26 and 3, respectively.
  • Highlighted the pseudocapacitive contribution of hierarchically nanostructured WO3 for enhanced energy density.

Conclusions:

  • All-solid-state, flexible microsupercapacitors can be effectively fabricated using laser patterning on WO3/PVDF/MWCNTs composites.
  • Hierarchically nanostructured WO3 is key to achieving high energy density in non-carbon-based flexible MSCs.
  • Optimizing composite composition and electrode design further enhances flexible MSC performance.