材料科学
复合材料
石墨烯
热导率
相变材料
热的
热能储存
聚乙二醇
相(物质)
光电子学
化学工程
纳米技术
气象学
热力学
物理
工程类
有机化学
化学
作者
Haoyu Zhao,Chao Shu,Xin Wang,Min Peng,Changjun Li,Fu‐Lin Gao,Xiaofeng Li,Zhong‐Zhen Yu
标识
DOI:10.1002/adfm.202302527
摘要
Abstract To remedy the drawbacks of weak solar‐thermal conversion capability, low thermal conductivity, and poor structural stability of phase change materials, pyramidal graphitized chitosan/graphene aerogels (G‐CGAs) with numerous radially oriented layers are constructed, in which the long‐range radial alignment of graphene sheets is achieved by a novel directional‐freezing strategy. A G‐CGA/polyethylene glycol phase change composite exhibits a thermal conductivity of 2.90 W m −1 K −1 with a latent heat of 178.8 J g −1 , and achieves a superior solar‐thermal energy conversion and storage efficiency of 90.4% and an attractive maximum temperature of 99.7 °C under a light intensity of 200 mW cm −2 . Inspired by waterlilies, solar‐responsive phase change composites (SPCCs) are designed for the first time by assembling the G‐CGA/polyethylene glycol phase change composites with solar‐driven bilayer films, which bloom by day and close by night. The heat preservation effect of the solar‐driven films leads to a higher temperature of SPCC for a longer period at night. The SPCC‐based solar–thermal–electric generator achieves output voltages of 499.2 and 1034.9 mV under light intensities of 200 and 500 mW cm −2 , respectively. Even after stopping the solar irradiation, the voltage output still occurs because of the latent heat release and the heat preservation of the films.
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