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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
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PANI-Coated VOx Nanobelts with Core-Shell Architecture for Flexible All-Solid-State Supercapacitor.
Qiang Zhang1, Xianran Li1, Yinyin Zheng1
1School of Electronic Information Engineering, Jingchu University of Technology, Jingmen 448000, China.
Micromachines
|October 28, 2023
Summary
Researchers developed a novel core-shell nanobelt material (PANI@VOx) for flexible supercapacitors. This advanced material significantly enhances conductivity and energy density, enabling efficient powering of portable electronics.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Vanadium oxide (VOx) is a pseudocapacitor material with mixed valence states, suitable for symmetric screen-printed supercapacitors.
- High internal resistance and low energy density limit VOx applications.
Purpose of the Study:
- To construct a two-dimensional PANI@VOx nanobelt with a core-shell architecture.
- To enhance the electrochemical performance of VOx for supercapacitor applications.
Main Methods:
- VOx nanobelts prepared via solvothermal method.
- In situ polymerization of polyaniline (PANI) onto VOx nanobelts.
- Fabrication of flexible all-solid-state symmetric supercapacitors (SSCs) using screen-printing.
Main Results:
- The PANI@VOx core-shell structure exhibited enhanced conductivity (0.7 ± 0.04 S/Ω).
- Achieved high specific capacitance (347.5 F/g at 0.5 A/g) and cycling stability (~72.0% after 5000 cycles).
- Demonstrated remarkable areal energy density (115.17 μWh/cm²) and powered a 3.0 V device.
Conclusions:
- The synergistic effect in PANI@VOx core-shell nanobelts improves conductivity and energy storage.
- Developed flexible symmetric supercapacitors show promise for powering portable and wearable electronics.
- This core-shell architecture offers new avenues for advanced pseudocapacitor materials.
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