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Planar supercapacitor devices with nanometer electrodes.

Sumana Kumar1, Rahul Tripathi1, Rajesh P Achary1

  • 1Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore, Karnataka 560012, India. abha@iisc.ac.in.

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|November 7, 2025
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Summary
This summary is machine-generated.

Researchers developed a novel planar supercapacitor using stacked graphene and molybdenum disulfide (MoS2) layers. This device demonstrates significantly enhanced energy storage capacity, paving the way for advanced miniaturized electronics.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Miniaturized electronic devices require high-performance on-chip energy storage solutions.
  • Two-dimensional materials offer unique properties for advanced energy storage applications.

Purpose of the Study:

  • To fabricate and characterize a planar supercapacitor utilizing stacked layers of graphene and molybdenum disulfide (MoS2).
  • To investigate the electrochemical performance and charge dynamics of the MoS2/graphene heterostructure.

Main Methods:

  • Fabrication of a planar supercapacitor with nanometer-thick stacked MoS2 and graphene electrodes.
  • Electrochemical characterization including areal capacitance measurements at various scan rates.
  • In situ biasing experiments to study capacitance enhancement and charge dynamics.

Main Results:

  • The MoS2/graphene supercapacitor achieved a high areal capacitance of 678 mF cm-2, a 2726% improvement over MoS2 electrodes alone.
  • Graphene's conducting interface facilitated enhanced electric double-layer formation in MoS2.
  • In situ biasing resulted in a 539% capacitance enhancement, indicating diffusion-dominant charging.

Conclusions:

  • The developed planar supercapacitor demonstrates superior energy storage performance compared to MoS2 electrodes alone.
  • The study highlights the role of graphene in enhancing charge dynamics and capacitance in MoS2-based devices.
  • This work provides a pathway for controlling charge dynamics in supercapacitors for energy storage applications.