Eco-friendly and cost – effective shape-stabilized composites from egg-shell/PEG for thermal energy storage

IF 6.9 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2025-06-25 DOI:10.1016/j.applthermaleng.2025.127308

Amira Akrouti , Abdelwaheb Trigui , Ammar Hidouri , Rym Hassani , Makki Abdelmouleh

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Abstract

A novel organic–inorganic bio-composite phase change material (BCP) for thermal energy storage was fabricated using eggshell-derived calcium carbonate (ECC), polyethylene glycol (PEG), and graphite (G) via a cost-effective mechanical milling process. A high PEG loading of 90 wt% was achieved while maintaining excellent shape stability and preventing leakage. Chemical compatibility of the BCPs was confirmed through FTIR analysis, indicating no chemical reactions between components. The optimized BCP composition (90 % PEG, 5 % ECC, and 5 % G by weight) demonstrated exceptional thermal stability (169.4 J/g latent heat), reduced supercooling (46.8 % lower than pure PEG), and enhanced shape stability due to synergistic interactions between ECC and graphite. For the first time, the integration of BCPs with thermoelectric generators (TEGs) was demonstrated, achieving a 2.8 V output sustained for 1380 s. This study bridges critical gaps in scalable, eco-friendly PCM development by utilizing waste eggshells and a solvent-free fabrication method, presenting a transformative approach for mid-temperature energy storage applications.

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环保和成本效益的形状稳定复合材料，从蛋壳/聚乙二醇的热能储存

以蛋壳衍生的碳酸钙（ECC）、聚乙二醇（PEG）和石墨(G)为原料，通过低成本的机械研磨工艺制备了一种新型的有机-无机生物复合相变材料（BCP）。在保持优异的形状稳定性和防止泄漏的同时，实现了90% wt%的高PEG负载。通过FTIR分析证实了bcp的化学相容性，表明组分之间没有化学反应。优化后的BCP组成（90% PEG， 5% ECC和5% G重量）表现出优异的热稳定性（169.4 J/ G潜热），减少过冷（比纯PEG低46.8%），并且由于ECC和石墨之间的协同作用增强了形状稳定性。首次演示了bcp与热电发电机（teg）的集成，实现了2.8 V输出，持续1380秒。本研究通过利用废蛋壳和无溶剂制造方法，弥合了可扩展、环保PCM开发方面的关键差距，为中温储能应用提供了一种变革性方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.