Bioinspired radiative cooling coating with high emittance and robust self-cleaning for sustainably efficient heat dissipation

Inspired by the lotus leaves, we present a bio-inspired radiative cooling coating (BRCC) with hierarchical porous structures, consisting of multiwalled carbon nanotubes, modified SiO2 and fluorosilicone resin. The BRCC displayed sustainably efficient heat dissipation by the combination of high emittance and robust self-cleaning property. It is expected to be a promising candidate for thermal management applications for power-intensive energy components.

Abstract:

To overcome the overheating phenomena of electronic devices and energy components, developing advanced energy-free cooling coatings with promising radiative property seem an effective and energy-saving way. However, the further application of these coatings is greatly limited by their sustainability because of their fragile and easy contamination. Herein, it is reported that a bioinspired radiative cooling coating (BRCC) displayed sustainably efficient heat dissipation by the combination of high emittance and robust self-cleaning property. With the hierarchical porous structure constructed by multiwalled carbon nanotubes (MWCNTs), modified SiO2 and fluorosilicone (FSi) resin, the involvement of the BRCC improves the cooling performance by increasing ≈25% total heat transfer coefficient. During the abrasion and soiling tests, the BRCC-coated Al alloy heat sink always displays stable radiative cooling performance. Moreover, the simulation and experimental results both revealed that reducing surface coverage of BRCC (≈80.9%) can still keep highly cooling efficiency, leading to a cost-effective avenue. Therefore, this study may guide the design and fabrication of advanced radiative cooling coating.

Author list:

Yong Li†, Yingnan Song†, Hongye Zu, Feilong Zhang, Hui Yang*, Wei Dai*, Jingxin Meng*, Lei Jiang

How to cite:

Y. Li, Y. Song, H. Zu, F. Zhang, H. Yang, W. Dai, J. Meng, L. Jiang, Exploration 2023, 20230085.
https://doi.org/10.1002/EXP.20230085