Using mesoporous carbon to pack polyethylene glycol as a shape-stabilized phase change material with excellent energy storage capacity and thermal conductivity

Feng, Daili; Li, Pei; Feng, Yanhui; Yan, Yuying; Zhang, Xinxin

Abstract

A novel shape-stabilized phase change material was successfully prepared using polyethylene glycol (PEG) as PCM and mesoporous carbon FDU-15 as support via the melting impregnation method. The structural and thermal properties of materials were measured by TEM, SEM, XRD, FT-IR, nitrogen adsorption-desorption isotherms and DSC, respectively. The maximum loading of PEG/FDU-15 reaches up to 75?wt%, and the corresponding crystallization ratio is 71%, which is superior to other mesoporous-based composite phase change materials. Molecular dynamic (MD) analysis showed that some PEG adhered to the pore wall with an amorphous structure which failed to crystallize, ultimately resulting in a gap between the measured latent heat and the theoretical value. It was interesting that the filling of PEG could stimulate the frequency shift of atomic vibration in FDU-15, which then just fell in the dominant vibrational zone of PEG, despite the suppressed atomic vibration of PEG after compounding. Accordingly, the thermal conductivity of the composite is more than 60% higher compared to pure PEG, which relates to the reinforced matching of the atomic vibration between the skeleton and PCM material. FDU-15 was applied to pack PCM for the first time and delivered a better thermal performance compared with other mesopore-based composite PCMs.

Citation

Feng, D., Li, P., Feng, Y., Yan, Y., & Zhang, X. (2021). Using mesoporous carbon to pack polyethylene glycol as a shape-stabilized phase change material with excellent energy storage capacity and thermal conductivity. Microporous and Mesoporous Materials, 310, Article 110631. https://doi.org/10.1016/j.micromeso.2020.110631

• Journal Article Type: Article
• Acceptance Date: Sep 7, 2020
• Online Publication Date: Sep 12, 2020
• Publication Date: 2021-01
• Deposit Date: Sep 15, 2020
• Publicly Available Date: Sep 13, 2021
• Journal: Microporous and Mesoporous Materials
• Print ISSN: 1387-1811
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 310
• Article Number: 110631
• DOI: https://doi.org/10.1016/j.micromeso.2020.110631
• Keywords: Polyethylene glycol; FDU-15; Composite phase change material; Thermal properties; Molecular dynamics
• Public URL: https://nottingham-repository.worktribe.com/output/4904686
• Publisher URL: https://www.sciencedirect.com/science/article/abs/pii/S1387181120306314