Sustainable Desalination Device Capable of Generating Electricity

V-H. Trinh, N-A. Nguyen, O. Omelianovych, H-S. Choi
Chungnam National University, Daejeon, South Korea

Poster stand number: T124

Keywords: Multi-walled carbon nanotubes, primary iron-air battery, conical structure, electricity generation, solar-to-steam

Freshwater shortage and the growing demand for electricity are the most common issues on the path toward achieving global sustainability. Therefore, finding creative solutions involving the use of renewable energy sources presents the main challenge. Herein, we developed a cost-effective and highly efficient 2-in-1 integrated conical device consisting of multi-walled carbon nanotubes deposited filter paper, and iron wire, capable of simultaneously generating not only freshwater but also electricity from seawater. The 3D multi-walled carbon nanotubes/paper conical structure is an interconnecting link between steam and electricity generation, providing spacious surface area for both interfacial evaporation and oxygen reduction reaction (as a cathode of metal-air battery). The use of multi-walled carbon nanotubes not only secures high broadband light absorptance (~97% in UV-Vis-NIR) but also its conductivity is vital for efficient electricity generation. The device is capable of generating a power density of 13.50 W·m-2 while maintaining an evaporation rate of 1.53 kg·m-2·h-1 under 1 kW·m-2 solar illumination.