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Hexagonal CeO2 nanostructures: an efficient electrode material for supercapacitors.

Nallappan Maheswari1, Gopalan Muralidharan

  • 1Department of Physics, Gandhigram Rurual Institute- deemed University, Gandhigram, Tamilnadu, India. muraligru@gmail.com.

Dalton Transactions (Cambridge, England : 2003)
|August 20, 2016
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Hexagonal cerium oxide (CeO2) nanostructures were synthesized for supercapacitor applications. These materials demonstrate excellent electrochemical properties, including high capacity and long-term stability, making them promising for energy storage devices.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Cerium oxide (CeO2) is a pseudocapacitive material with potential for energy storage.
  • Developing efficient nanostructures is key to enhancing supercapacitor performance.

Purpose of the Study:

  • To synthesize hexagonal CeO2 nanostructures using a hydrothermal method.
  • To investigate the effect of calcination temperature on CeO2 properties for supercapacitors.
  • To evaluate the electrochemical performance and cyclic stability of CeO2-based supercapacitors.

Main Methods:

  • Hydrothermal synthesis of hexagonal CeO2 nanostructures using cetyl trimethyl ammonium bromide (CTAB).
  • Calcination of synthesized nanostructures at varying temperatures.
  • Electrochemical characterization including charge/discharge tests and cyclic stability analysis.
  • Fabrication and testing of an asymmetric supercapacitor device.

Main Results:

  • Hexagonal CeO2 nanostructures were successfully synthesized.
  • Calcination temperature influenced morphology, structure, and electrochemical properties.
  • High specific capacity (927 F g(-1) at 2 A g(-1)) and excellent rate capability were observed.
  • 100% capacity retention after 1500 cycles at 20 A g(-1) demonstrated superior cyclic stability.
  • An asymmetric supercapacitor achieved an energy density of 45.6 Wh kg(-1) at 187.5 W kg(-1).

Conclusions:

  • Hexagonal CeO2 nanostructures are highly effective electrode materials for supercapacitors.
  • The synthesized CeO2 exhibits excellent electrochemical performance, including high capacity, rate capability, and cyclic stability.
  • These findings highlight the potential of CeO2 nanostructures for advanced energy storage solutions.