Cellulose nanofibril/polypyrrole hybrid aerogel supported form-stable phase change composites with superior energy stora
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ORIGINAL RESEARCH
Cellulose nanofibril/polypyrrole hybrid aerogel supported form-stable phase change composites with superior energy storage density and improved photothermal conversion efficiency Jianing Xu . Yunlong Tan . Xiaosheng Du Haibo Wang
. Zongliang Du . Xu Cheng .
Received: 8 July 2020 / Accepted: 3 September 2020 Ó Springer Nature B.V. 2020
Abstract The development of phase change materials (PCMs) with high energy storage density, enhanced photothermal conversion efficiency and good form-stability is essential for practical application in utilization of solar energy. Herein, novel PCM composites (CPPCMs) with extremely high energy storage density and superb solar-thermal conversion performance were fabricated by introducing n-octacosane into three-dimensional (3D) porous cellulose nanofibril (CNF)/polypyrrole (PPy) hybrid aerogels. Due to the strong encapsulation capability of CNF/PPy hybrid aerogels (CPAs), the synthesized PCM composites maintained perfect shape stability above the melting point of n-octacosane. Further investigation showed CPPCMs exhibited extremely high latent heat in the range of 239.4–258.4 J/g and high loading rate of n-octacosane (up to 96%). The melting/cooling cycling test and thermogravimetric analysis indicated
J. Xu Y. Tan X. Du (&) Z. Du X. Cheng H. Wang (&) College of Biomass Science and Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu 610065, People’s Republic of China e-mail: [email protected] H. Wang e-mail: [email protected] X. Du Z. Du X. Cheng H. Wang The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, People’s Republic of China
the composite PCMs possessed excellent cyclic stability and thermal stability. Moreover, simulated sunlight test showed that the photothermal conversion efficiency of CPPCMs significantly improved with the increased content of polypyrrole in the PCM composites. In conclusion, the obtained PCM composites, which exhibited excellent shape stability, superior solar-heat conversion capability and extremely high energy storage density, showed considerable potential for practical utilization and storage of solar energy. Keywords Phase change materials Cellulose nanofibril Polypyrrole n-octacosane Photothermal conversion
Introduction With the rapidly growing energy demand and austere environmental pollution from burning of traditional fossil fuels, the development of environmentalfriendly, enormous and sustainable energy source has attracted tremendous attentions of academia and industry recently (Wei et al. 2018; Zhu et al. 2019; Song et al. 2019). Solar energy, which is renewable, abundant and clean, is expected to alleviate energy crisis or even substitute for fossil fuels (Wei et al. 2019). However, the direct and efficient utilization of solar energy is difficult to achieve because of the intermittence and instability nature of solar irradiation
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