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Nanosheet-assembled NiO microstructures for high-performance supercapacitors.

Kamatchi Kamaraj Purushothaman¹, Inbamani Manohara Babu, Balasubramanian Sethuraman

¹Department of Physics, TRP Engineering College (SRM Group) , Irungalur, Tamilnadu, India.

ACS Applied Materials & Interfaces

|October 16, 2013

Summary

Hydrothermal synthesis created nanosheet-assembled Nickel Oxide (NiO) microstructures for supercapacitors. Optimized at 160 °C, these NiO nanosheets offer high capacitance and excellent stability for energy storage applications.

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Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Nickel Oxide (NiO) is a promising material for electrochemical energy storage.
Developing efficient synthesis methods for nanostructured NiO is crucial for enhancing supercapacitor performance.

Purpose of the Study:

To synthesize nanosheet-assembled NiO microstructures using a hydrothermal method.
To investigate the effect of preparation temperature on NiO properties for supercapacitor applications.
To evaluate the electrochemical performance and stability of the synthesized NiO nanosheets.

Main Methods:

Hydrothermal synthesis utilizing an anionic surfactant to induce self-assembly.
Morphological and structural characterization of NiO microstructures.

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Electrochemical testing, including cyclic voltammetry and charge/discharge cycles, to assess supercapacitor performance.

Main Results:

Nanosheet-assembled NiO microstructures were successfully synthesized.
NiO nanosheets prepared at 160 °C exhibited a specific capacitance of 989 F g⁻¹ at 3 mV s⁻¹.
The material demonstrated excellent capacity retention (97% after 1000 cycles) and an energy density of 49.45 W h kg⁻¹.

Conclusions:

The hydrothermal self-assembly method is effective for creating NiO nanosheet microstructures.
Optimized NiO nanosheets show significant potential as electrode materials for high-performance supercapacitors.
The synthesized NiO offers a promising combination of high capacitance, stability, and energy density.