Shape-Memory Three-Dimensional Evaporators with High Portability for Efficient Solar-Driven Freshwater Production

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Solar-driven water evaporation offers a sustainable solution to water scarcity.
• Existing 3D solar evaporators achieve high efficiency but face challenges in scalability, portability, and manufacturing complexity.

Purpose of the Study:

• To develop a highly portable and efficient 3D solar evaporator for freshwater production.
• To overcome the limitations of traditional 3D solar evaporators regarding manufacturing and portability.

Main Methods:

• Fabrication of a 3D solar evaporator by depositing MXene onto low-cost lignin-cellulosic sponges.
• Utilizing a shape-memory effect to enable compression into a thin film (89.3% volume reduction) and rapid restoration in water.
• Testing evaporation rate, stability, and recyclability under solar illumination.

Main Results:

• Achieved a high solar evaporation rate of 2.48 kg m⁻² h⁻¹ under 1 sun illumination.
• Demonstrated excellent long-term stability and recyclability of the 3D solar evaporator.
• The device functions as a self-contained water reservoir, enhancing application flexibility.

Conclusions:

• The developed MXene-based shape-memory 3D solar evaporator offers a novel approach to portable and efficient freshwater production.
• This technology shows significant potential for facilitating the transition of 3D solar evaporators from laboratory research to commercial applications.