Three-dimensional carbon foam-metal oxide-based asymmetric electrodes for high-performance solid-state...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Micro-supercapacitors are crucial for portable electronics.
• Developing high-performance, stable electrodes is essential for energy storage devices.

Purpose of the Study:

• To fabricate a novel asymmetric planar micro-supercapacitor using a 3D carbon foam (CF) architecture.
• To investigate the electrochemical performance of CF-based electrodes incorporating manganese oxide (MnO) and iron oxide (Fe2O3).

Main Methods:

• Direct spray patterning of active materials onto interdigital electrodes.
• Fabrication of a solid-state asymmetric micro-supercapacitor utilizing CF-MnO as the positive electrode and CF-Fe2O3 as the negative electrode.

Main Results:

• Achieved ultrahigh supercapacitance of 18.4 mF cm⁻² (2326.8 mF cm⁻³) at 5 mV s⁻¹.
• Demonstrated a wide potential window of 1.4 V with an energy density of 5 μW h cm⁻².
• Exhibited excellent cyclic stability with 86.1% capacitance retention after 10,000 cycles.

Conclusions:

• The developed CF-based asymmetric micro-supercapacitor offers superior electrochemical performance.
• The combination of CF with pseudocapacitive metal oxides presents a promising strategy for advanced energy storage solutions.