摘要
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/m 2 (approximately ninefold) and 51.5 W/m 2 , 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.