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首页> 外文期刊>Renewable energy >Polyethylene glycol/silica (PEG@SiO_2) composite inspired by the synthesis of mesoporous materials as shape-stabilized phase change material for energy storage
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Polyethylene glycol/silica (PEG@SiO_2) composite inspired by the synthesis of mesoporous materials as shape-stabilized phase change material for energy storage

机译：聚乙二醇/二氧化硅（PEG @ SiO_2）复合材料受中孔材料合成的启发，该材料用作形状稳定的相变材料用于储能

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摘要

Inspired by the common preparation method of mesoporous silica where polyethylene glycol (PEG) was used as template to obtain porous silica, PEG/silica (PEG@SiO2) composite as shape-stabilized phase change material for energy storage was well prepared. In this paper, PEG was used as phase change material (PCM) to store and release thermal energy and SiO2 acted as the supporting matrix. Various techniques were employed to characterize the structural and thermal properties of PEG@SiO2. The results indicate that PEG was encapsulated in SiO2 shell with physical interactions. The phase change enthalpy of PEG@SiO2 is 164.9 J/g in the melting process and 160.1 J/g in the solidifying process with the mass fraction of 97 wt%. It is a considerably exciting result as the value is so close to pristine PEG's (178.6 J/g). PEG@SiO2 exhibited excellent thermal reliability based on the results of undergoing the heating-cooling cycle 100 times. Also, PEG@SiO2 had a good thermal stability within its working temperature range. This study provides a general approach for increasing the loading of PCMs in porous materials and thus the energy storage capability. (C) 2019 Elsevier Ltd. All rights reserved.
机译：受中孔二氧化硅常用制备方法的启发，以聚乙二醇（PEG）为模板制备多孔二氧化硅，制备了PEG /二氧化硅（PEG @ SiO2）复合材料作为形状稳定的储能相变材料。在本文中，PEG被用作相变材料（PCM）来存储和释放热能，而SiO2作为支撑基质。采用了各种技术来表征PEG @ SiO2的结构和热性能。结果表明，PEG通过物理相互作用被包裹在SiO2壳中。 PEG @ SiO2的相变焓在熔融过程中为164.9J / g，在固化过程中为160.1J / g，质量分数为97重量％。该值非常接近原始PEG（178.6 J / g），这是一个令人兴奋的结果。基于经历100次加热-冷却循环的结果，PEG @ SiO2具有出色的热可靠性。同样，PEG @ SiO2在其工作温度范围内具有良好的热稳定性。这项研究提供了增加多孔材料中PCM的负荷从而提高储能能力的通用方法。 （C）2019 Elsevier Ltd.保留所有权利。

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