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Preparation and Phase Transition Properties of Cellulose-based Composite Phase Change Energy Storage Materials
Received:November 08, 2024  
DOI：10.11980/j.issn.0254-508X.2025.03.001
Key Words:cellulose  aerogel  composite phase change energy storage materials  phase separation
Fund Project:广东省基础与应用基础研究基金（2023A1515110431，2024A1515011654）。
Author NameAffiliationPostcode
HAN Chen State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
WANG Yang* State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640
School of Chemistry and Chemical Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 		510640
YANG Rendang State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
CHENG Chen State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
GUO Xiaohui State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
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Abstract:In order to overcome the problem that hydrated salt phase change materials are prone to leakage during the energy storage phase change process， in this study， aerogel carrier （MFC/PVA/G） with porous structure were prepared from microfibrillated cellulose （MFC）， polyvinyl alcohol （PVA）， and graphene （G） by using freeze-drying technology， and after loading the phase change material Na2SO4·10H2O based on vacuum impregnation method， composite phase change energy storage materials （MFC/PVA/G-PCM）. The results showed that the MFC/PVA/G had good loading effect on Na2SO4·10H2O with excellent dimensional stability and anti-leakage， and the thermal conductivity was improved by more than 150% compared with that of pure Na2SO4·10H2O. With the increase of PVA content， the specific surface area of MFC/PVA/G increased and the pore size decreased. Comparing with other MFC/PVA/G-PCM， when the mass ratio of MFC and PVA was 8∶2， the enthalpy of MFC8/PVA2/G-PCM was the largest， with the enthalpy of solidification being 169.5 J/g and the enthalpy of melting being 217.8 J/g. In the range of 0~50 ℃， the enthalpy of solidification after 300 phase change cycles was not changed much， with the enthalpy of solidification being 165.6 J/g and the enthalpy of melting 170.3 J/g， which had good stability of phase change cycle. In addition， the introduction of 4% borax into Na2SO4·10H2O could significantly improve the energy storage phase change performance of MFC/PVA/G-PCM， resulting in an increase in the crystallisation temperature and a decrease in the degree of supercooling （within the variation range of 1 ℃）.
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