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Biomass-based shape-stabilized phase change materials from artificially cultured ship-shaped diatom frustules with high enthalpy for thermal energy storage
Composites Part B: Engineering ( IF 13.1 ) Pub Date : 2020-10-28 , DOI: 10.1016/j.compositesb.2020.108500
Bangyao Wu , Sha Lyu , He Han , Tao Li , Haoyang Sun , Jaw-Kai Wang , Dandan Li , Fan Lei , Jintao Huang , Dazhi Sun

The high adsorption capacity of the phase change mediums in porous supports is a key requirement for the shape-stabilized phase change materials (ss-PCMs) with high latent heat. Here, ship-shaped diatom (Pennales) frustule-based composite ss-PCMs with high polyethylene glycol (PEG) absorption capacity and high phase change enthalpy was prepared by a solution-assisted vacuum impregnation method for high-performance thermal energy storage. To improve the diatom frustules’ specific surface area and form a multi-level pore structure, the effects of calcination temperature on the microstructure of diatom frustules were studied. It was found that diatom frustules calcined at 400 °C (400CDF) had a relatively high specific surface area (~155.9 m2/g) with a well-maintained skeleton, which was a suitable PEG supporter. The devised PEG/400CDF composites with 72.7% loading of PEG4000 that had a latent heat value of 128.9 J/g for melting and 136.7 J/g for freezing, and the relative enthalpy efficiency reached up to 97.7%. The composite ss-PCMs exhibited thermal and chemical stability even after 200 thermal cycles. The current work demonstrated that ss-PCMs from biomass-based artificially cultured diatoms could slow the spread of heat by absorbing thermal energy. Moreover, the phase change mechanisms of the PEG/CDF composites under the nanoconfinement in the diatom frustules framework were also explored to explain the obtained high adsorption capacity.



中文翻译:

来自具有高焓的人工培养船形硅藻壳的生物质基形状稳定相变材料,用于热能存储

多孔载体中相变介质的高吸附能力是具有高潜热的形状稳定的相变材料(ss-PCM)的关键要求。在这里,通过溶液辅助真空浸渍法制备了具有高聚乙二醇(PEG)吸收能力和高相变焓的船形硅藻壳(Pennales)壳基复合材料ss-PCM,用于高性能热能存储。为了提高硅藻壳的比表面积并形成多层孔隙结构,研究了煅烧温度对硅藻壳微观结构的影响。发现在400°C(400CDF)下煅烧的硅藻壳具有相对较高的比表面积(〜155.9 m 2/ g)具有良好维护的骨架,该骨架是合适的PEG载体。设计的PEG / 400CDF复合材料具有72.7%的PEG4000负载量,其熔融的潜热值为128.9J / g,冷冻的潜热值为136.7J / g,相对焓效率高达97.7%。即使在200次热循环后,复合材料ss-PCM仍具有热稳定性和化学稳定性。当前的工作表明,基于生物质的人工培养的硅藻中的ss-PCMs可以通过吸收热能来减缓热量的传播。此外,还探索了在硅藻壳结构纳米约束下PEG / CDF复合材料的相变机理,以解释获得的高吸附容量。

更新日期:2020-11-03
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