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Micromachined Planar Supercapacitor with Interdigital Buckypaper Electrodes.

Yun-Ting Chen1, Cheng-Wen Ma2, Chia-Ming Chang3

  • 1Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan. ytchen@mems.me.ntu.edu.tw.

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|November 15, 2018
PubMed
Summary

This study presents a flexible micro-supercapacitor using buckypaper electrodes fabricated via a simple vacuum filtration method. The device demonstrates excellent flexibility, high specific capacitance (107.27 mF/cm²), and stable performance over 1000 cycles.

Keywords:
carbon nanotube (CNT)micro-supercapacitor (micro-SC)patterned buckypapervacuum filtration

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Flexible electronics require advanced energy storage solutions.
  • Micro-supercapacitors offer compact and efficient power options.
  • Buckypaper electrodes provide unique electrochemical properties.

Purpose of the Study:

  • To develop a flexible micro-supercapacitor with interdigital planar buckypaper electrodes.
  • To investigate a simple fabrication process for these devices.
  • To evaluate the electrochemical performance and stability of the flexible micro-supercapacitors.

Main Methods:

  • Fabrication of in-plane interdigital buckypaper electrodes using vacuum filtration and SU-8 molding.
  • Cyclic voltammetry to measure specific capacitance.
  • Charge-discharge tests to assess electrochemical stability and cycle life.
  • Electrochemical impedance spectroscopy (Nyquist plot) to determine equivalent series resistance.

Main Results:

  • Achieved a maximum specific capacitance of 107.27 mF/cm² at 20 mV/s.
  • Demonstrated linear increase in specific capacitance with buckypaper electrode thickness.
  • Exhibited high cycle stability with 96.59% retention after 1000 cycles.
  • Measured a low leakage current of approximately 9.95 µA after 3600 s.
  • Obtained an equivalent series resistance of approximately 18 Ω.

Conclusions:

  • The proposed fabrication method yields flexible micro-supercapacitors with excellent performance.
  • The devices are suitable for integration into flexible electronic systems.
  • Buckypaper electrodes offer a promising material for advanced energy storage applications.