Magnetically Induced Ordered Structure-Assisted Defect Engineering Strategy for High-Performance All-Pseudocapacitive...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Film supercapacitors are crucial for wearable electronics due to their flexibility and light weight.
• Achieving high energy density in film supercapacitors is challenging due to limited research on pseudocapacitive electrode materials.

Purpose of the Study:

• To develop high-performance film electrodes for supercapacitors.
• To enhance the energy density and cycling stability of film supercapacitors for wearable devices.

Main Methods:

• Fabrication of film electrodes (Fe@Fe3O4/CNTs anode and NiCo-NiCo compound/CNTs cathode) using vacuum filtration.
• Utilizing Density Functional Theory (DFT) calculations and experimental validation.
• Investigating the impact of oxygen vacancies on electrode material properties.

Main Results:

• Oxygen vacancies enhance charge transfer at the Fe/Fe3O4 interface, leading to a specific capacity of 7.88 F cm-2 for the anode.
• Oxygen vacancies improve adhesion energy, enhancing cycling stability with 76% capacitance retention after 20,000 cycles.
• The assembled all-pseudocapacitive film supercapacitor achieves an energy density of 1.362 mWh cm-2.

Conclusions:

• The developed film electrodes with engineered oxygen vacancies significantly boost supercapacitor performance.
• This advancement offers a promising solution for high-energy-density power sources in wearable electronics.
• The findings pave the way for next-generation flexible energy storage devices.