NiO/Ni Nanowafer Aerogel Electrodes for High Performance Supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Transition metal oxide aerogels possess unique properties like high porosity and large surface area.
• These materials are gaining attention for advanced energy storage applications.

Purpose of the Study:

• To design and fabricate a two-electrode supercapacitor device using α-Ni(OH)2 aerogels and annealed NiO/Ni aerogels.
• To evaluate the electrochemical performance and properties of these aerogels for supercapacitor applications.

Main Methods:

• Synthesis of α-Ni(OH)2 and annealed NiO/Ni aerogels.
• Characterization using X-ray diffraction, electron microscopy (SEM, TEM), BET, and XPS.
• Fabrication and testing of a two-electrode supercapacitor device.

Main Results:

• Annealed NiO/Ni aerogels demonstrated a specific capacity of 422 C/g at 1 A/g and excellent cycling stability over 10,000 cycles.
• The specific capacitance of NiO/Ni aerogels was over double that of α-Ni(OH)2 aerogels.
• The supercapacitor achieved an energy density of 32.4 Wh/kg and a power density of 1800 W/kg.

Conclusions:

• Annealed NiO/Ni aerogels are highly effective electrode materials for supercapacitors.
• The fabricated supercapacitor device shows promising performance for practical energy storage.
• The study highlights the potential of transition metal oxide aerogels in advanced energy technologies.