Flexible freestanding MoS₂-based composite paper for energy conversion and storage

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Flexible electrochemical devices are crucial for modern energy storage and generation.
• Developing materials with high flexibility, mechanical strength, and chemical stability is essential.

Purpose of the Study:

• To synthesize a flexible MoS2-based composite paper.
• To evaluate its performance in supercapacitors, hydrogen evolution reaction (HER), and lithium-ion batteries (LIB).

Main Methods:

• High-energy shear force milling and vacuum filtration for material synthesis.
• Chronopotentiometric charge-discharge measurements for capacitance determination.
• Electrochemical testing for HER and LIB performance evaluation.

Main Results:

• Achieved a capacitance of 33 mF·cm⁻² at 1 mA·cm⁻² for supercapacitor applications.
• Demonstrated an onset potential of -0.2 V vs RHE for HER, further improved to -0.1 V vs RHE after n-butyllithium treatment.
• Delivered a specific capacity of 740 mA·h·g⁻¹ at 0.1 A·g⁻¹ for LIBs with 91% capacity retention after 40 cycles, usable without binders or current collectors.

Conclusions:

• The synthesized MoS2-based composite paper exhibits excellent flexibility, mechanical strength, and electrochemical performance.
• This material shows significant potential for flexible supercapacitors, HER electrocatalysis, and binder-free lithium-ion batteries.
• The findings highlight a promising pathway for developing advanced flexible energy storage and generation devices.