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Composite phase change material based on reduced graphene oxide/expanded graphite aerogel with improved thermal properties and shape‐stability
Author(s) -
Ren Wanwan,
Cao Liu,
Zhang Dong
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4900
Subject(s) - aerogel , materials science , composite number , graphene , composite material , graphite , thermal stability , phase change material , thermal conductivity , graphite oxide , oxide , thermal energy storage , chemical engineering , thermal , nanotechnology , metallurgy , ecology , physics , meteorology , engineering , biology
Summary Composite phase change materials (PCMs) based on reduced graphene oxide/expanded graphite (rGO/EG) aerogel were prepared by hydrothermal self‐assembly and impregnation method. The morphology, chemical structure, thermal properties, and shape‐stability of the composite PCMs based on rGO/EG aerogel were examined. The results show that rGO sheets form a three‐dimensional (3D) network structure and EG particles are attached to rGO sheets and uniformly interspersed in the aerogel. The oxygen‐containing functional groups remaining in rGO/EG aerogel promote heterogeneous crystallization of paraffin, leading to increased latent heat. The 3D thermally conductive pathway provided by rGO/EG aerogel improves the composite PCM's thermal conductivity up to 0.79 W·m −1 ·K −1 , which is about 4 times of that of pure paraffin. The leakage of composite PCMs is remarkably improved at very high percentage of paraffin. Simulative light‐thermal experiments reveal that the composite PCMs have the ability of conversion and storage of light‐thermal energy. In short, 3D network structure of rGO, with the aid of EG, endows the composite PCMs with improved thermal properties, good shape‐stability, and light‐thermal storage performance.