High-Performing Clean Water Production by Rational Design of Functional Solar Evaporator and Vapor Condensation

Area of Science:

• Materials Science
• Environmental Engineering
• Renewable Energy

Background:

• Interfacial solar evaporation offers a sustainable solution for water scarcity but is limited by low water collection rates.
• Existing solar evaporation technologies struggle with inefficient vapor condensation and collection, hindering practical application.

Purpose of the Study:

• To design and demonstrate an inverted solar evaporation and condensation device for high water production.
• To improve both solar-to-vapor conversion and water collection efficiencies for practical desalination.

Main Methods:

• Fabrication of a nanostructured solar evaporator using graphene oxides, carbon dots, and MXene with vertically aligned vapor diffusion channels.
• Integration of a bottom condenser cooled by bulk water with a hydrophobic coating.
• Utilizing an inverted structure to enhance downward vapor transport and dual-surface evaporation.

Main Results:

• The inverted device achieved a record water collection rate of 2.31 kg m⁻² h⁻¹ under one sun.
• The nanostructure effectively confined thermal energy, optimizing evaporation.
• The design facilitated efficient downward vapor transport and accelerated dropwise condensation.

Conclusions:

• The developed inverted solar evaporator significantly enhances water collection rates compared to conventional systems.
• This technology shows great potential for efficient and practical seawater desalination.
• Optimizing both evaporation and condensation is crucial for advancing solar water production.