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<p>Passive daytime radiative cooling (PDRC) offers a zero-energy solution to mitigate the global energy crisis, yet insufficient solar reflection and complex fabrication procedures may hinder its practical applications. Herein, this study presents hierarchically structured zinc oxide (ZnO) clusters regulated by the matrix-regenerated cellulose fibrils (RCFs) template for efficient PDRC. A proposed ZnCl<sub>2</sub>-mediated cellulose dissolution-regeneration strategy is developed to yield hydroxyl-rich RCFs with anchored Zn<sup>2+</sup> ions, thereby facilitating the interfacial self-assembly of well-dispersed, flower-like ZnO clusters. Acting as efficient scattering centers, these hierarchical micro/nano architectures enhance light scattering via multiple internal reflections, endowing the ZnO/RCFs composites with an ultrahigh solar reflectivity (as high as 99.6% in the visible-light region to the near-infrared range) and ultra violet (UV) resistance (&gt; 240&#xa0;h). Based on experimental results and theoretical simulations, a 'hierarchical-confined scattering' effect is proposed to clarify this mechanism. Combined with the high infrared emissivity (96.7%) in the mid-infrared region of the RCFs matrix, this synergy enables a remarkable daytime sub-ambient cooling of 11.2&#xa0;°C. Energy consumption simulations further demonstrate its significant energy-saving potential across diverse climatic zones in China by reducing cooling demand. Notably, the ZnO/RCFs composites can be processed into various PDRC products via different techniques. This work offers a scalable and sustainable strategy to develop high-performance PDRC materials to address escalating global energy challenges.</p> Graphical Abstract <p></p>

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Scalable Cellulose-Templated Micro/Nano Clusters with Hierarchical Nanoconfined Scattering via Interface Self-Assembly for Efficient Passive Daytime Radiative Cooling

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Xiaoshuang Liu,
  • Chao Duan,
  • Kang Yang,
  • Xin Tong,
  • Chaochao Tian,
  • Chenyang Cai,
  • Yonghao Ni

摘要

Passive daytime radiative cooling (PDRC) offers a zero-energy solution to mitigate the global energy crisis, yet insufficient solar reflection and complex fabrication procedures may hinder its practical applications. Herein, this study presents hierarchically structured zinc oxide (ZnO) clusters regulated by the matrix-regenerated cellulose fibrils (RCFs) template for efficient PDRC. A proposed ZnCl2-mediated cellulose dissolution-regeneration strategy is developed to yield hydroxyl-rich RCFs with anchored Zn2+ ions, thereby facilitating the interfacial self-assembly of well-dispersed, flower-like ZnO clusters. Acting as efficient scattering centers, these hierarchical micro/nano architectures enhance light scattering via multiple internal reflections, endowing the ZnO/RCFs composites with an ultrahigh solar reflectivity (as high as 99.6% in the visible-light region to the near-infrared range) and ultra violet (UV) resistance (> 240 h). Based on experimental results and theoretical simulations, a 'hierarchical-confined scattering' effect is proposed to clarify this mechanism. Combined with the high infrared emissivity (96.7%) in the mid-infrared region of the RCFs matrix, this synergy enables a remarkable daytime sub-ambient cooling of 11.2 °C. Energy consumption simulations further demonstrate its significant energy-saving potential across diverse climatic zones in China by reducing cooling demand. Notably, the ZnO/RCFs composites can be processed into various PDRC products via different techniques. This work offers a scalable and sustainable strategy to develop high-performance PDRC materials to address escalating global energy challenges.

Graphical Abstract