1.8 V all-solid-state flexible asymmetric microsupercapacitors based on direct-writing electrodes

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Microsupercapacitors require higher energy density for practical applications.
• Asymmetric microsupercapacitors (AMSCs) using pseudocapacitive materials can enhance capacitance and operating voltage.

Purpose of the Study:

• To design and prepare pseudocapacitive electrodes for AMSCs via a one-step direct-writing method.
• To improve the energy density and performance of microsupercapacitors.

Main Methods:

• Developed double-electric-layer-structured pseudocapacitive electrodes.
• Utilized a one-step direct-writing fabrication technique.
• Tested AMSCs in a polyvinyl alcohol/LiCl gel electrolyte.

Main Results:

• Achieved a wide operating voltage window of 1.8 V.
• Obtained a high areal capacitance of 42 mF cm^-2.
• Demonstrated an outstanding areal energy density of 18.9 μW h cm^-2.

Conclusions:

• The developed AMSCs exhibit excellent performance due to structural advantages and complementary electrode voltages.
• This study presents a novel approach for creating high-performance microsupercapacitors.
• The findings support the advancement of microsupercapacitors for portable electronic devices.