MXene-enhanced paper/hydrogel bilayer moisture-driven generator for long-term energy output

Area of Science:

• Materials Science
• Renewable Energy Technologies
• Nanotechnology

Background:

• Moisture-driven energy generators (MEGs) face challenges with humidity dependence and transient power output.
• Practical applications are limited by environmental sensitivity and inconsistent energy generation.

Purpose of the Study:

• To develop a high-performance, environmentally tolerant, and sustained power-generating MEG.
• To overcome the limitations of existing MEGs for broader applicability.

Main Methods:

• Fabrication of a bilayer MEG by integrating MXene-impregnated paper with a polyacrylamide (PAM) hydrogel.
• Utilizing the synergistic properties of electronegative MXene, porous paper, and a hydrogel water reservoir.
• Modification with sodium lactate to create an organic hydrogel for enhanced water retention.

Main Results:

• The MXene-impregnated paper-hydrogel MEG (MPH-MEG) achieved a 0.537 V open-circuit voltage and 4.8 μW cm⁻² power density at 40% RH.
• The MXene-impregnated paper-organic hydrogel MEG (MPO-MEG) demonstrated sustained voltage (∼350 mV) for over 7 days at 40% RH.
• Scalable MPO-MEG units successfully powered commercial timers and LEDs.

Conclusions:

• A novel and facile strategy for creating high-performance, stable MEGs was presented.
• The developed MEGs offer sustained power generation without requiring additional humid environments.
• This technology shows potential for practical, self-powered electronic devices.