High-Temperature All Solid-State Microsupercapacitors based on SiC Nanowire Electrode and YSZ Electrolyte.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Supercapacitors are crucial for energy storage.
• High-temperature operation is a key challenge for current energy storage devices.
• Advanced materials are needed for extreme environment applications.

Purpose of the Study:

• To develop a stable, high-performance supercapacitor for high-temperature applications.
• To investigate the electrochemical properties of silicon carbide nanowires and yttria-stabilized zirconia at elevated temperatures.
• To demonstrate a functional supercapacitor operating at record high temperatures.

Main Methods:

• Fabrication of a symmetric supercapacitor using silicon carbide nanowires (SiC NWs) as electrodes and yttria-stabilized zirconia (YSZ) as the electrolyte.
• Testing of the supercapacitor's performance at temperatures up to 450°C.
• Evaluation of areal capacitance, power density, and cycling stability.

Main Results:

• The SiC NWs/YSZ/SiC NWs supercapacitor demonstrated excellent thermal stability.
• High areal capacitance of 92 μF cm⁻² was achieved at 450°C and 100 mV s⁻¹.
• The device maintained over 60% capacitance after 10,000 cycles at 450°C and 200 mV s⁻¹.
• A maximum areal power density of 100 μW cm⁻² was recorded at 450°C.

Conclusions:

• Symmetric supercapacitors based on SiC NWs and YSZ exhibit remarkable performance at high temperatures.
• This technology offers a promising solution for energy storage in extreme environments.
• The demonstrated device paves the way for reliable high-temperature energy storage solutions.