香港理工大学吕琳教授 (本文通讯作者) 团队近期和Prof. Li Pei（共同通讯作者）合作研发了一种具有新激发机制的自适应辐射制冷涂层用于建筑节能和降低城市温度，相关成果于2024年6月19日发表于《Chemical Engineering Journal》期刊。论文第一作者为课题组博士后龚权，论文题为:“Solar-driven Adaptive Radiative Cooling Coating with Polymer Carbon Dots-enhanced Photoluminescence for Urban Skin”。
论文信息：
Q. Gong, H. Chun Wong, J. Chen, P. Li, L. Lu, Solar-driven adaptive radiative cooling coating with polymer carbon dots-enhanced photoluminescence for urban skin, Chemical Engineering Journal, 2024. 153262.
https://doi.org/10.1016/j.cej.2024.153262
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摘要
自适应的日间辐射冷却（RC）涂层可根据需要调整冷却能力，是一种先进的零能耗城市建筑冷却技术。目前，自适应RC涂层的研究主要集中在温度驱动机制上，其发展受制于有限的相变材料选择。为了拓展自适应RC涂层的研究，本文率先提出了太阳能驱动的自适应辐射冷却（SARC）涂层，它可以根据太阳辐照强度调节冷却能力。为实现这一目标，本研究创新性地引入了碳点，即 PEI/Poly(St-co-BA)@CDs 作为光致发光材料，能将吸收的太阳能转化为光能。基于这种聚合物基的碳点，我们设计了智能冷却珠，使其表面具有亲水性，更容易溶解在水溶液中以规模化生产。此外，通过将碳点均匀地分布在智能冷却珠表面，使其获得了更高的量子产率（33.6%）。以水溶液SARC屋顶涂层为例说明，在强太阳辐射下，开发的 SARC 涂层的有效太阳反射率从 92.5 % 提高到 95 %。此外，自适应冷却性能（比静态涂层低 1.5 K 至 3.2 K）随太阳辐射（从 220 W. m-2 到 880 W. m-2）的变化而变化，证明了冷却效率的提高。这些发现验证了我们基于碳量子点开发的SARC 涂层的策略是简单、环保和可扩展的，并且碳点的成功引入有望在未来为彩色辐射制冷涂层的发展提供新路径。
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Abstract
Abstract: Adaptive passive daytime radiative cooling coating adjusts cooling capacity on an as-needed basis, making it an advanced zero-energy building cooling technology for urban skin. Currently, research mostly focuses on temperature-driven mechanisms, constrained by the limited availability of phase change materials. To address this challenge, this study pioneers the fabrication of a Solar-driven Adaptive Radiative Cooling (SARC) coating, which can adjust cooling capacity based on solar irradiance. To achieve this objective, the polymer Carbon Dots (CDs), PEI/Poly(St-co-BA)@CDs, are innovatively incorporated in SARC coating as the photoluminescent materials to convert the absorbed solar energy into light energy. Notably, the polymer-based CDs enable the design of Smart Cooling Beads (SCBs) whose surfaces are hydrophilic, making it easier to get dissolved in aqueous solutions. Moreover, the CDs were evenly distributed on the surfaces of SCBs, allowing it to achieve a higher quantum yield, recorded as 33.6%. Illustrated with an aqueous coating example for demonstration, the effective solar reflectance of developed SARC coating increases from 92.5% to 95% under solar radiation. Furthermore, the adaptive cooling performance (1.5 °C to 3.2 °C lower than static coatings) varies with solar radiation (from 220 W. m-2 to 880 W. m-2), demonstrating an energy efficiency improvement. These findings validate the SARC coating as a simple, feasible, environmentally friendly, and scalable solution for the advancement of next-generation smart urban skin.
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关键词
Solar-driven radiative cooling（太阳能驱动的辐射制冷）
Photoluminescence（光致发光）
Low-carbon buildings（低碳建筑）
Polymer carbon dots（碳点）
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图文导读
图1 新型太阳能驱动自适应辐射制冷涂层的：a) 工作原理；b) 冷却效率；c) 有效光谱；d) 性能优势；e) 应用场景。
图2 建筑节能性能表现
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创新之处
本文创新之处主要有两点：
1. 开发了一种具有新型激发机制的自适应辐射制冷涂层，利用光致发光的特点使得涂层在白天具备更优异的冷却效率。
2. 率先将碳量子点与辐射制冷结合，碳点的成功引入有望在未来为彩色辐射制冷涂层的发展提供新路径。
欢迎大家对本工作进行指正，欢迎同行学者合作研究！！！
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图文 |龚权 龍景 吕琳
编辑 | 龚权 龍景
审核 | 吕琳 龍景
