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- Title
Bioinspired Intelligent Solar‐Responsive Thermally Conductive Pyramidal Phase Change Composites with Radially Oriented Layered Structures toward Efficient Solar–Thermal–Electric Energy Conversion.
- Authors
Zhao, Hao‐Yu; Shu, Chao; Wang, Xin; Min, Peng; Li, Changjun; Gao, Fu‐Lin; Li, Xiaofeng; Yu, Zhong‐Zhen
- 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.
- Subjects
HEAT storage; ENERGY conversion; PHASE change materials; THERMAL conductivity; LATENT heat; LIGHT intensity; STRUCTURAL stability
- Publication
Advanced Functional Materials, 2023, Vol 33, Issue 33, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202302527