标题（中文）：基于介孔材料的制备方法合成储能用稳定相变材料聚乙二醇/二氧化硅复合材料的研究
标题（英文）：Polyethylene glycol/silica (PEG@SiO2) composite inspired by the synthesis of mesoporous materials as shape-stabilized phase change material for energy storage
刊物名称及期号、页码： Renewable Energy ISSN 0960-1481， Volume 145, January 2020, Pages 84-92
作者姓名（中文）：李炳蒙，舒丹，王瑞芳，翟兰兰，柴玉叶、兰云军，曹宏伟，邹超
作者姓名（英文）：Bingmeng Li , Dan Shu , Ruifang Wang, Lanlan Zhai , Yuye Chai , Yunjun Lan , Hongwei Cao , Chao Zou
摘要（英文）：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.
研究现状（中文）：相变材料聚乙二醇（PEG）单独使用时熔化过程中的易泄漏问题限制了PEG在储能中的适用性。目前采用的支撑材料吸附包裹法中相变材料的吸附量明显受限于多孔介质的吸附能力。与支撑材料的平均孔径和孔几何形状定量相关，这表明吸收能力本质上取决于多孔材料的孔结构。通过对多孔材料进行预处理，包括真空和脱气在内的预处理，提高了复合材料的焓值和PEG的质量分数，但是，同时也消耗了大量的能量和时间。表面活性剂的添加对于稳定乳液促进相变材料的包封是必要的，但它们降低了复合材料中相变材料的质量分数。在介孔氧化物的合成过程中，PEG通常需要在高温下煅烧或用溶剂洗涤，操作复杂，费时费力。
创新点（中文）：1、SiO2廉价易得，且包覆在SiO2壳层中PEG与SiO2具有物理相互作用，使得复合材料结构稳定，避免泄露问题的发生。
2、采用溶胶-凝胶法，制备的整个过程在低成本下操作简单，而不需要任何载体材料的预处理，操作简便。
3、PEG在制备PEG@sio2材料过程中扮演了能量存储材料和表面活性剂两个角色。避免了额外的表面活性剂和催化剂的加入，而导致的复合材料相变焓的降低。
4、本研究采用溶胶-凝胶法在介孔材料的制备方法基础上保留被高温烧掉或者溶剂洗涤掉的芯材聚乙二醇，实现原料的充分利用，降低了实验成本。
原文链接：https://doi.org/10.1016/j.renene.2019.05.118
