Eco-friendly and scalable radiative cooling for metal substrates with electrophoretically deposited chitosan

Jui Yung Chang, Hong Sheng Han, Chu Yang Wang, Linshuang Long, Liping Wang, Mikhail Sheremet, Igor Miroshnichenko, Yu Bin Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Radiative cooling is becoming more popular in various applications since the heat is dissipated passively with zero energy consumption. Radiative cooling for metallic substrates was developed in this study via electrophoretic deposition of a chitosan layer. The tailored optical properties, generality to different metals, and the cost-effectiveness of the employed fabrication facility are described. The deposited areas are scalable without requiring high-precision lithography, and the chitosan itself has trivial environmental impacts. The addition of the chitosan layer increased the thermal emissions of stainless steel and platinum substrates by 52.4 W/m2 (approximately ninefold) and 51.5 W/m2, respectively. The durability of the cooling performance was validated after sunlight exposure. The sample temperature decreased during the daytime by up to 2.4 °C under high humidity, and reached 4.4 °C in dry surroundings. The feasibility of using an ecofriendly material for scalable radiative cooling has been experimentally demonstrated.

Original languageEnglish (US)
Article number110707
JournalSolar Energy Materials and Solar Cells
Volume216
DOIs
StatePublished - Oct 2020

Keywords

  • Chitosan
  • Eco-friendly
  • Electrophoretic deposition
  • Radiative cooling
  • Wavelength-selective emission

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films

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