多孔金刚石 Co-MOF 和聚乙二醇复合材料作为形式稳定的热能储存相变材料

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2024-11-16 DOI:10.1016/j.molstruc.2024.140776

Zeng-Ni Xiang , Ling Wu , Jia-Rong Chen , Meng-Xia Ma , Zhong-Mei Xian , Mei-Yu Xu , Guang-Ming Liang

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引用次数: 0

摘要

形态稳定相变材料（FSPCMs）由于成本相对较高和封装技术繁琐，在热能存储领域的应用有限。本研究采用直接浸渍法，将聚乙二醇（PEG）浸渍到三维多孔金刚石钴金属有机框架（Co-MOF）中，制成了低成本的 FSPCM。多孔 Co-MOF 支持材料具有许多密集的 H 键结构，能够将 PEG 分子捕获并封装在其晶格中，即使在 100 °C 下也能保持 PEG 基体的形态稳定，不会发生泄漏。同时，Co-MOF 的三维金刚石构型可提供连续的传热路径，从而使 FSPCM 复合材料（95.9 wt%）显示出很高的转换焓（203.38 kJ/kg），封装效率和浸渍率分别达到惊人的 96.00 % 和 97.14 %。此外，FSPCM 还具有出色的高耐久性，即使经过 30 次加热/冷却循环，相变温度和潜热值也仅有轻微变化。

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Porous diamond Co-MOF and polyethylene glycol composites as form-stable phase change materials for thermal energy storage

Form-stable phase change materials (FSPCMs) have limited applications in the field of thermal energy storage because of their relatively high costs and cumbersome encapsulation technologies. In this study, low-cost FSPCMs were created using a straightforward direct impregnation method by impregnating polyethylene glycol (PEG) into three-dimensional porous diamond cobalt metal organic framework (Co-MOF). The porous Co-MOF support material, with many intense H-bonding motifs, has the ability to trap and encapsulate PEG molecules in its crystal lattices, and keeps the form stable of PEG matrix without leakage even at 100 °C. Meanwhile, the three-dimensional diamond configuration of the Co-MOF can offer successive heat transfer paths, leading to the FSPCM composite (95.9 wt%) demonstrating high transition enthalpy (203.38 kJ/kg) with astonishing encapsulation efficiency and impregnation ratio of 96.00 % or 97.14 %, respectively. Additionally, FSPCM reveals outstanding high durability with only slight alterations in temperature of phase transition and value of latent heat even after 30 heating/cooling cycles.

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.