Tang Bo, Song Fei, Wu Jia-Min, Tan Qiang-Wu, Zhao Yu-Yao, Zhou Jie, Chen Xi, Wang Xiu-Li, Wang Yu-Zhong
The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China.
ACS Appl Mater Interfaces. 2024 Oct 16;16(41):56159-56169. doi: 10.1021/acsami.4c12693. Epub 2024 Oct 5.
Carbon neutrality necessitates new technologies for renewable energy utilization, active regulation of heat exchange, and material recycling to promote green and intelligent building development. Currently, the integration of these functions and characteristics into a single coating material presents a significant challenge. Here, we demonstrate a novel triboelectric and radiative cooling coating with mussel-inspired architectures, fabricated using cellulose nanofibers and Mica-TiO as a functional mortar and brick, respectively. The abundant polar groups and specific surface area of cellulose nanofibers enable a high accumulation of induced electrostatic charges, allowing the coating to act as a tribolayer to generate triboelectric outputs. The regularly layered arrangement of Mica-TiO endows fire resistance to the coating, which exhibits self-extinguishing properties and maintains 45% of its original electrical output even after direct exposure to flame for 20 s. Additionally, the created multilayered stacking morphology, as well as intense group vibrations of Mica-TiO, facilitates high reflectivity ( = 0.9) and long-wave infrared emissivity (ϵLWIR = 0.94), achieving a daytime subambient temperature drop of 5.3 °C. Notably, the coating can be recycled easily while maintaining its triboelectric, radiative cooling, and fire-resistant properties. This work provides an innovative strategy for unifying triboelectric and radiative cooling functions, as well as recyclability, into a single coating material, offering new insights for future sustainable and energy-efficient buildings.
碳中和需要用于可再生能源利用、主动调节热交换和材料回收的新技术，以促进绿色智能建筑的发展。目前，将这些功能和特性集成到单一涂层材料中面临重大挑战。在此，我们展示了一种具有贻贝启发结构的新型摩擦电和辐射冷却涂层，分别使用纤维素纳米纤维和云母 - 二氧化钛作为功能灰浆和砖块制备而成。纤维素纳米纤维丰富的极性基团和比表面积能够实现感应静电荷的高积累，使涂层充当摩擦层以产生摩擦电输出。云母 - 二氧化钛的规则分层排列赋予涂层耐火性，该涂层具有自熄性能，即使在直接暴露于火焰20秒后仍能保持其原始电输出的45%。此外，所形成的多层堆叠形态以及云母 - 二氧化钛强烈的基团振动促进了高反射率（ = 0.9）和长波红外发射率（ϵLWIR = 0.94），实现了白天低于环境温度5.3°C的降温。值得注意的是，该涂层在保持其摩擦电、辐射冷却和耐火性能的同时可以轻松回收。这项工作为将摩擦电和辐射冷却功能以及可回收性统一到单一涂层材料中提供了一种创新策略，为未来可持续和节能建筑提供了新的见解。
