MOF改性硬脂酸复合相变材料的热物性研究

doi:10.12028/j.issn.2095-4239.2018.0035

储能科学与技术 ›› 2018, Vol. 7 ›› Issue (4): 654-660.doi: 10.12028/j.issn.2095-4239.2018.0035

MOF改性硬脂酸复合相变材料的热物性研究

李丹¹, 程晓敏^1,2, 李元元¹

1. 武汉理工大学材料科学与工程学院, 湖北武汉 430070;
2. 黄冈师范学院, 湖北黄冈 438000

收稿日期:2018-03-09 修回日期:2018-03-22 出版日期:2018-07-01 发布日期:2018-04-24
通讯作者: 程晓敏,教授,研究方向为高性能储热材料,E-mail:chengxm@whut.edu.cn
作者简介:李丹(1991-),女,硕士研究生,研究方向为相变储热材料,E-mail:lidan1104@whut.edu.cn
基金资助:
湖北省科技支撑计划项目（2015BAA111）。

Thermal properties of a modified MOF-stearic acid composite phase change materials

LI Dan¹, CHENG Xiaomin^1,2, LI Yuanyuan¹

1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China;
2. School of Mechanical and Electrical Engineering, Huanggang Normal University, Huanggang 438000, Hubei, China

Received:2018-03-09 Revised:2018-03-22 Online:2018-07-01 Published:2018-04-24

摘要/Abstract

摘要： 以ZIF-67作为金属有机框架（MOF），通过原位沉淀法生长在膨胀石墨片上对膨胀石墨进行改性，经过煅烧后形成Co₃O₄/EG分级多孔混合结构。为了优化硬脂酸的充放热性能，将Co₃O₄/EG与硬脂酸通过熔融共混和真空吸附法复合，制备出具有优异充放热性能的SA/Co₃O₄/EG复合相变材料。表征SA/Co₃O₄/EG复合相变材料的微结构、物相、相变焓值、相变温度和充放热时间等热物理性能，分析添加物Co₃O₄/EG的微结构对硬脂酸相变储热材料微结构和热性能产生的影响。添加物Co₃O₄/EG对SA/Co₃O₄/EG复合相变材料的相变温度影响较小，相变温度与Co₃O₄/EG添加量没有依赖关系。而复合储热材料的相变潜热随Co₃O₄/EG量的增加而减少，但与理论计算相差较少。Co₃O₄/EG分级多孔结构可以阻止Co₃O₄的团聚并提供高比表面积和孔体积吸附硬脂酸，多孔隙结构Co₃O₄和高热导率膨胀石墨（EG）的协同作用可以增加硬脂酸相变储热材料的热传递，缩短充放热时间，提高充放热效率。

关键词: 硬脂酸, Co₃O₄/EG, 相变材料

Abstract: ZIF-67, a metal-organic framework (MOF), was grown on expanded graphite (EG) sheet by in-situ precipitation to obtain modified ZIF-67/EG, which, upon calcination, formed a hierarchical porous Co₃O₄/EG hybrid. By using a melting blending and vacuum adsorption methods, stearic acid (SA), SA/Co₃O₄/EG composite phase change material (PCM) was then prepared. The materials were characterized for their microstructure, phase, phase change enthalpy, phase change temperature and charging/discharging behavior. The influence of the microstructure of Co₃O₄/EG on the thermal properties of the SA/Co₃O₄/EG composite PCMs was analyzed. The results showed that the effect of Co₃O₄/EG on the phase transition temperature of SA/Co₃O₄/EG composite PCMs was small, and the phase transition temperature was independent of the amount of Co₃O₄/EG addition. However, the latent heat of the composites PCMs decreased with increasing Co₃O₄/EG content, consistent with the theoretical calculation. The Co₃O₄/EG hierarchical porous structure was shown to be able to prevent the agglomeration of Co₃O₄, providing a high specific surface area and pore volume adsorption of SA. The synergistic effect of the porous structure Co₃O₄ and high thermal conductivity of EG could increase the heat transfer of SA and improve the heat release rate.

Key words: stearic acid, Co₃O₄/EG, phase change materials

中图分类号:

TK02

李丹, 程晓敏, 李元元. MOF改性硬脂酸复合相变材料的热物性研究[J]. 储能科学与技术, 2018, 7(4): 654-660.

LI Dan, CHENG Xiaomin, LI Yuanyuan. Thermal properties of a modified MOF-stearic acid composite phase change materials[J]. Energy Storage Science and Technology, 2018, 7(4): 654-660.

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MOF改性硬脂酸复合相变材料的热物性研究

Thermal properties of a modified MOF-stearic acid composite phase change materials

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