Phase change materials encapsulated in graphene hybrid aerogels with high thermal conductivity for efficient solar-thermal energy conversion and thermal management of solar PV panels

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2024-08-22 DOI:10.1016/j.tca.2024.179853

Fangfang He , Weijie Hong , Zhipeng Liu , Yulin Zhu , Yongsheng Li , Zhuoni Jiang , Zhengguo Chen , Wenbin Yang

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Abstract

Phase change materials (PCMs) have a wide range of applications in latent heat storage and thermal management. However, their practical use is hindered by high leakage rates and low thermal conductivity. To address these issues, polyvinyl alcohol/carboxylated carbon nanotubes/graphene hybrid aerogels (PCG) were carbonized at high temperatures to obtain polyvinyl alcohol/carboxylated carbon nanotubes/graphene carbon aerogels (cPCG). Polyethylene glycol (PEG) was then encapsulated within cPCG to form cPCG@PEG shape-stabilized PCMs (SSPCMs). These cPCG@PEG SSPCMs demonstrated excellent thermal conductivity (0.843 W•m^-1•K^-1) and superior solar-thermal conversion performance (91.8%). Additionally, the latent heat of cPCG@PEG showed a minimal decrease even after 100 melt-crystallization cycles. An experimental setup was designed to regulate the temperature of solar photovoltaic (PV) panels using cPCG@PEG. The results indicated that cPCG@PEG effectively managed the temperature of solar PV panels under varying light conditions. This study presents a novel approach for enhancing the application of porous PCMs in solar energy utilization and thermal management of equipment.

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石墨烯混合气凝胶中封装的相变材料具有高导热性，可用于太阳能光伏板的高效光热转换和热管理

相变材料（PCM）在潜热储存和热管理方面有着广泛的应用。然而，高泄漏率和低导热性阻碍了它们的实际应用。为解决这些问题，在高温下对聚乙烯醇/羧基碳纳米管/石墨烯混合气凝胶（PCG）进行碳化，得到聚乙烯醇/羧基碳纳米管/石墨烯碳气凝胶（cPCG）。然后将聚乙二醇（PEG）封装在 cPCG 中，形成 cPCG@PEG 形状稳定 PCM（SSPCM）。这些 cPCG@PEG SSPCMs 具有出色的热导率（0.843 W-m-1-K-1）和卓越的太阳能-热转换性能（91.8%）。此外，即使经过 100 次熔融-结晶循环，cPCG@PEG 的潜热降低幅度也很小。研究人员设计了一套实验装置，利用 cPCG@PEG 调节太阳能光伏（PV）板的温度。结果表明，在不同的光照条件下，cPCG@PEG 能有效控制太阳能光伏板的温度。这项研究为提高多孔 PCM 在太阳能利用和设备热管理中的应用提供了一种新方法。

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来源期刊

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes