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Fast Energy Storage in Two-Dimensional MoO2 Enabled by Uniform Oriented Tunnels.

Yuanyuan Zhu1, Xu Ji2, Shuang Cheng1

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Ultrathin molybdenum dioxide (MoO2) sheets with oriented tunnels enable fast pseudocapacitive energy storage. This material demonstrates high capacity and excellent cycling stability for advanced battery applications.

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RamanMoOcapacitordensity functional theory calculationsenergy storage

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Pseudocapacitive electrodes offer higher energy storage than electrical double-layer capacitive electrodes.
  • Limited rate capability in pseudocapacitors is often due to sluggish reaction kinetics or poor conductivity.
  • Molybdenum dioxide (MoO2) exhibits superior electronic and ionic conductivity, making it promising for fast energy storage.

Purpose of the Study:

  • To prepare and characterize ultrathin MoO2 sheets with oriented tunnels for pseudocapacitive energy storage.
  • To investigate the potential of MoO2 as a high-performance electrode material for fast charge storage and release.

Main Methods:

  • Preparation and characterization of ultrathin MoO2 sheets.
  • Fabrication of a composite electrode with MoO2 and graphene oxide (GO).
  • Electrochemical performance testing (capacity, rate capability, cycling stability).
  • Operando Raman spectroscopy, X-ray analyses, and density functional theory (DFT) calculations to study structural changes.

Main Results:

  • The MoO2/GO composite electrode achieved a capacity of 1097 C g-1 at 2 mV s-1 and 390 C g-1 at 1000 mV s-1.
  • The electrode maintained approximately 80% of its initial capacity after 10,000 cycles at 50 mV s-1.
  • Minimal structural changes and highly reversible volume changes (∼14%) during cycling were observed, indicating high stability.

Conclusions:

  • Ultrathin MoO2 sheets with oriented tunnels are effective pseudocapacitive electrodes for fast charge storage.
  • The material exhibits excellent rate capability, high capacity, and long cycling life due to its intrinsic conductivity and structural stability.
  • The findings highlight MoO2 as a promising material for next-generation energy storage devices.