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<p>Passive radiative cooling can cool objects exposed to sunlight without requiring additional energy input. However, it remains challenging to develop aesthetically pleasing coloured materials without sacrificing solar reflectance. Here we present a biomass-derived, bilayer and coloured ethyl cellulose (BCEC) coating fabricated in a single casting step through controlled drying-induced self-stratification. By adjusting the precursor concentration, we tune the thickness of the top layer to produce different colours through thin-film interference without introducing solar absorption. The hierarchically porous bottom layer provides high solar reflectance and long-wave infrared emission. The BCEC coating achieves solar reflectance of 97.0% and sub-ambient daytime radiative cooling of up to 9 °C under a solar intensity of 800 W m<sup>−</sup><sup>2</sup>. In field tests conducted in the humid subtropical climate of Hong Kong, the BCEC coating outperforms commercially available coloured paints and fluorescence-based coloured coatings. Our one-step phase-separation approach can simplify fabrication, facilitating the practical deployment of this technology.</p>

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One-step-processed bilayer ethyl cellulose for full-colour sub-ambient daytime radiative cooling

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • Ying Liu,
  • Niklas Blagojevic,
  • Qingdong Xuan,
  • Jiahe Liu,
  • Yuan Liao,
  • Yang Fu,
  • Yanbo Fang,
  • Pengfei Cheng,
  • Xueling Xu,
  • Tao Wang,
  • Naiqin Yi,
  • Wei Li,
  • Marcus Müller,
  • Jian-Guo Dai,
  • Ronggui Yang,
  • Dangyuan Lei

摘要

Passive radiative cooling can cool objects exposed to sunlight without requiring additional energy input. However, it remains challenging to develop aesthetically pleasing coloured materials without sacrificing solar reflectance. Here we present a biomass-derived, bilayer and coloured ethyl cellulose (BCEC) coating fabricated in a single casting step through controlled drying-induced self-stratification. By adjusting the precursor concentration, we tune the thickness of the top layer to produce different colours through thin-film interference without introducing solar absorption. The hierarchically porous bottom layer provides high solar reflectance and long-wave infrared emission. The BCEC coating achieves solar reflectance of 97.0% and sub-ambient daytime radiative cooling of up to 9 °C under a solar intensity of 800 W m−2. In field tests conducted in the humid subtropical climate of Hong Kong, the BCEC coating outperforms commercially available coloured paints and fluorescence-based coloured coatings. Our one-step phase-separation approach can simplify fabrication, facilitating the practical deployment of this technology.