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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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Related Experiment Video

Updated: Dec 6, 2025

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
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MnCO3 on Graphene Porous Framework via Diffusion-Driven Layer-by-Layer Assembly for High-Performance Pseudocapacitor.

Binbin Zhang1, Xin Li2, Jianli Zou2

  • 1CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.

ACS Applied Materials & Interfaces
|October 8, 2020
PubMed
Summary

This study developed a 3D porous graphene-MnCO3 composite for supercapacitors. The hybrid material shows high capacitance and excellent stability, overcoming limitations of manganese carbonate.

Keywords:
diffusion-driven layer-by-layer assemblygrapheneinterfacial assemblymanganese carbonatesupercapacitor

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Graphene oxide (GO) can be assembled into 3D porous frameworks using diffusion-driven layer-by-layer (dd-LbL) assembly.
  • These GO frameworks retain oxygen functional groups, serving as nucleation sites for composite material synthesis.
  • Manganese carbonate (MnCO3) is a promising pseudocapacitive material for supercapacitors but suffers from poor conductivity and stability.

Purpose of the Study:

  • To utilize a 3D porous GO scaffold for creating graphene-MnCO3 hybrid structures.
  • To enhance the electrochemical performance of MnCO3 by integrating it with a reduced graphene oxide (rGO) conductive backbone.
  • To evaluate the supercapacitive performance and stability of the novel graphene-MnCO3 composite.

Main Methods:

  • Fabrication of a 3D porous graphene oxide (GO) macrostructure via diffusion-driven layer-by-layer (dd-LbL) assembly.
  • Hydrothermal synthesis of MnCO3 nanoparticles onto the GO scaffold by reacting KMnO4 with GO.
  • Characterization of the resulting graphene-MnCO3 hybrid structure and evaluation of its electrochemical performance in supercapacitors.

Main Results:

  • Uniform MnCO3 nanoparticles were successfully synthesized on the porous GO scaffold.
  • The graphene-MnCO3 composite electrode achieved a high capacitance of 698 F g-1 at 0.5 mA.
  • The composite electrode demonstrated excellent cycling stability, retaining 77% of its capacity after 5000 cycles at 20 mA.

Conclusions:

  • The 3D porous GO scaffold derived from dd-LbL assembly is a suitable platform for creating high-performance graphene-based composites.
  • The integration of MnCO3 nanoparticles with an rGO conductive backbone significantly improves pseudocapacitive performance and stability.
  • This graphene-MnCO3 hybrid material shows great potential for advanced supercapacitor applications.