Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 256, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2023.128365
Keywords
Phase change materials; Wood-derived carbon dots; Carbon skeletons; Photothermal conversion; Thermal-energy harvester
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In this study, a series of all-wood-derived carbon-assisted phase change materials (PCMs) were successfully synthesized by incorporating carbon dots-modified polyethylene glycol matrix into carbon skeletons. The as-fabricated PCMs showed excellent thermal performance, cycling stability, and energy conversion efficiency, indicating their promising potential for practical applications in thermal-energy harvesters.
The collection and storage of renewable, sustainable and clean energy including wind, solar, and tidal energy has attracted considerable attention because of its promising potential to replace fossil energy sources. Advanced energy-storage materials are the core component for energy harvesters, affording the high-efficiency conversion of these new-style energy sources. Herein, originated from nature, a series of all-wood-derived carbon-assisted phase change materials (PCMs) were purposed by incorporating carbon dots-modified polyethylene glycol matrix into carbon skeletons via a vacuum-impregnation strategy. The resultant PCMs possessed desired anti-leakage capability and superior thermophysical behaviors. In particular, the optimum sample posed high latent heat (131.5 J/g) and well thermal stability, where the corresponding enthalpy still reserved 90 % over 100 heating/ cooling cycles. More importantly, the as-fabricated thermal-energy harvester presented prominent capability to strorage and release multiple forms of thermal energy, as well as high-efficiency solar-energy utilization, cor-responding to a photothermal conversion efficiency of 88 % in simulated sunlight irradiation, far exceeding some reported PCMs. Overall, with the introduction of wood-derived carbon dots and carbon skeletons, the assembled all-wood-derived carbon-assisted PCMs afforded trinity advantages on thermal performance, cycling stability, and energy conversion efficiency, which provide a promising potential for the practical application in thermal-energy harvesters.
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