High-performance asymmetric supercapacitor based on CdCO₃/CdO/Co₃O₄ composite supported on Ni foam

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Developing advanced electrode materials is crucial for enhancing supercapacitor performance.
• Hybrid supercapacitors offer a promising avenue for high energy and power density applications.

Purpose of the Study:

• To synthesize a novel CdCO3/CdO/Co3O4 composite material.
• To fabricate and evaluate an asymmetric hybrid supercapacitor device using this composite.

Main Methods:

• Combined hydrothermal-annealing method for composite synthesis.
• Assembly of an asymmetric hybrid supercapacitor with CdCO3/CdO/Co3O4 and activated carbon electrodes.

Main Results:

• The supercapacitor achieved a specific capacitance of 84 F g⁻¹ at 1 mA cm⁻².
• Demonstrated a high energy density of 26.3 Wh kg⁻¹ and power density of 2290 W kg⁻¹.
• Exhibited a wide potential window of 1.5 V and retained 92% capacitance after 6000 cycles.

Conclusions:

• The CdCO3/CdO/Co3O4 composite is a highly effective electrode material for asymmetric hybrid supercapacitors.
• The fabricated device shows potential for powering small electronic applications, demonstrating practical viability.