3D Binder-Free Mo@CoO Electrodes Directly Manufactured in One Step via Electric Discharge Machining for In-Plane...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Cobalt oxide-based in-plane microsupercapacitors (IPMSCs) are promising for Internet of Things (IoT) energy sources due to resource abundance and high capacitance.
• Low electronic conductivity of cobalt oxide limits its use in energy storage.

Purpose of the Study:

• To develop a novel, simple, safe, efficient, and eco-friendly manufacturing method for cobalt oxide-based IPMSCs.
• To synthesize Mo-doped and oxygen-vacancy-enriched Co-CoO microelectrodes using electric discharging machining (EDM).

Main Methods:

• A single-step electric discharging machining (EDM) process was employed to synthesize Mo-doped and oxygen-vacancy-enriched Co-CoO integrated microelectrodes.
• Mo@Co-CoO IPMSCs with customized structures were fabricated without additional processing, toxic chemicals, binders, or conductive fillers.

Main Results:

• Mo@Co-CoO IPMSCs with three loops (IPMSCs3) achieved a maximum areal capacitance of 30.4 mF cm^-2 at 2 mV s^-1.
• The fabricated IPMSCs demonstrated excellent capacitive performance at a high scanning rate of 100 V s^-1, significantly outperforming existing CoO-based electrodes.

Conclusions:

• The novel one-step EDM fabrication method simplifies the production of advanced microelectronic energy storage devices.
• This approach offers a new pathway for intelligent, digital, and green manufacturing of metal oxide materials and microdevices.