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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Boosted Na+-MnO2 supercapacitor performance via strong metal support interaction.

Kailun Wang1, Junjie Wang1, Jun Qian2

  • 1School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui 230601, China.

Journal of Colloid and Interface Science
|December 8, 2024
PubMed
Summary

This study enhances manganese dioxide (MnO2) supercapacitors by incorporating sodium ions (Na+) and depositing them onto copper/graphene (Cu/G) composites. This strategy boosts ion migration, conductivity, and electrochemical performance for advanced energy storage.

Keywords:
Cu nanoparticlesGrapheneMetal-support interactionMnO(2)Supercapacitors

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Manganese dioxide (MnO2) is a key electrode material for supercapacitors.
  • Challenges include sluggish ion migration, aggregation, and low conductivity, hindering supercapacitor performance.
  • Optimizing MnO2-based supercapacitors requires addressing these limitations.

Purpose of the Study:

  • To enhance the electrochemical performance of MnO2-based supercapacitors.
  • To improve ion migration and conductivity in MnO2 electrode materials.
  • To develop a facile strategy for creating high-performance supercapacitor electrodes.

Main Methods:

  • Utilized NaMnO4 as a precursor to introduce Na+ ions into the δ-MnO2 lattice.
  • Deposited Na+-MnO2 onto copper/graphene (Cu/G) composites.
  • Leveraged strong metal-support interactions (SMSI) between Cu and graphene.

Main Results:

  • Achieved a conductivity of 5.78 × 10-3 S cm-1 for the Cu/G/MnO2 composite, significantly higher than MnO2 alone.
  • Exhibited a specific capacitance of 655 F g-1 at 1 A g-1 with 95% capacitance retention after 4000 cycles.
  • Assembled a 1.6 V asymmetric supercapacitor (Cu/G/MnO2 cathode, carbon anode) with a specific capacitance of 75 F g-1 and energy density of 27 Wh kg-1.

Conclusions:

  • The Na+ incorporation and deposition onto Cu/G composites effectively enhance MnO2 supercapacitor performance.
  • The SMSI effect between Cu and graphene plays a crucial role in improving conductivity and reducing aggregation.
  • This facile strategy offers a promising route for developing high-performance MnO2-based supercapacitors for energy storage applications.