Mesoporous NH₄NiPO₄·H₂O for High-Performance Flexible All-Solid-State Asymmetric Supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Wearable energy storage devices are in high demand but face challenges in achieving both flexibility and long-term stability.
• Developing flexible systems with high performance remains a significant hurdle in the field of portable electronics.

Purpose of the Study:

• To assemble a flexible all-solid-state supercapacitor with enhanced performance.
• To investigate the electrochemical and mechanical properties of the novel device.

Main Methods:

• Fabrication of a flexible all-solid-state supercapacitor device.
• Electrochemical testing including cycling stability at a specific current density.
• Mechanical testing involving bending and application of weight.

Main Results:

• The assembled NH4NiPO4·H2O//graphene supercapacitor demonstrated a capacitance of 121 mF cm-2 at 5 mA cm-2.
• The device exhibited robust cycling stability, retaining performance after 3,000 cycles.
• High mechanical flexibility was confirmed, with capacitance maintained under bending up to 180° and weights up to 50 g.

Conclusions:

• A high-performance flexible all-solid-state supercapacitor was successfully developed.
• The NH4NiPO4·H2O//graphene system offers a promising solution for stable and flexible wearable energy storage.
• The device's durability under mechanical stress opens avenues for practical applications in flexible electronics.