Green conversion of delignified sorghum straw and polyethylene glycol into form-stable phase change materials with promising solar energy capture, transition, and storage capabilities

Phase change materials (PCMs) have attracted considerable attention as a thermal energy management technology for thermal storage. However, achieving high energy-storing abilities, low leakage rates, and solar absorption abilities simultaneously in PCMs remains greatly challenging. This research pro...

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Bibliographic Details
Published in:International journal of biological macromolecules 2024-03, Vol.261 (Pt 2), p.129808-129808, Article 129808
Main Authors: Ren, Junchao, Lu, Wenyu, Zhang, Fuqiang, Han, Xiangsheng, Cai, Hongzhen, Yang, Keyan
Format: Article
Language:English
Subjects:
absorption
Biochar
carbon
Composite film
cooling
delignification
energy conservation
enthalpy
lignin
micropores
phase transition
polyethylene glycol
solar energy
Sorghum straw-based PCMs
straw
thermal energy
Thermal stabilities
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Summary:Phase change materials (PCMs) have attracted considerable attention as a thermal energy management technology for thermal storage. However, achieving high energy-storing abilities, low leakage rates, and solar absorption abilities simultaneously in PCMs remains greatly challenging. This research proposed a green strategy for preparing sorghum straw-based PCMs. By facile delignification and solvothermal process, delignified sorghum straw (DSS) and carbon quantum dots (CQDs) derived from removal lignin are prepared. The obtained PEG@CQDs/DSS possessed considerable reusable stabilities, excellent photo-thermal conversion properties, and thermal energy management capacities due to the delicate micropores and intrinsic noncovalent interactions among components. Especially, the PEG@CQDs-7.5/DSS exhibited superior solar-thermal conversion capabilities (with conducive photo-thermal conversion efficiency ~90.84%), and kept stable after 100 cycles of heating and cooling, in which the melting enthalpy value is ~168.1 J/g (enthalpy efficiency of ~91.11%). In conclusion, the synthesized PCMs showed potential for application in energy-saving and building thermal management. [Display omitted] •CQDs was used to improve photothermal conversion efficiency of composites.•Renewable sorghum straw was used as support materials to fabricate PEG@CQDs/DSS.•PEG@CQDs/DSS exhibited great potential in the field of thermal energy storage.•PEG@CQDs/DSS took advantages of low leakage rates, stability, and reliability.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2024.129808