Preparation and Characterization of Graphite–SiO2 Composites for Thermal Storage Cement-Based Materials

Thermal storage cement-based materials, formed by integrating phase change materials into cementitious materials, exhibit significant potential as energy storage materials. However, poor thermal conductivity severely limits the development and application of these materials. In this study, an amorph...

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Bibliographic Details
Published in:Materials 2024-06, Vol.17 (12), p.2880
Main Authors: He, Chenhao, Li, Xiangguo, Yang, Lv, Jianming Dan, Yan, Haitian, Shi, Xiangqin
Format: Article
Language:English
Subjects:
Admixtures
Amorphous materials
Carbon
Cement hydration
Compressive strength
Encapsulation
Energy consumption
Energy storage
Ethanol
Graphene
Graphite
Heat conductivity
Heat transfer
Latent heat
Mechanical properties
Phase change materials
Phase transitions
Silicon dioxide
Test methods
Thermal conductivity
Thermal energy
Thermal storage
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Summary:Thermal storage cement-based materials, formed by integrating phase change materials into cementitious materials, exhibit significant potential as energy storage materials. However, poor thermal conductivity severely limits the development and application of these materials. In this study, an amorphous SiO2 shell is encapsulated on a graphite surface to create a novel thermally modified admixture (C@SiO2). This material exhibits excellent thermal conductivity, and the surface-encapsulated amorphous SiO2 enhances its bond with cement. Further, C@SiO2 was added to the thermal storage cement-based materials at different volume ratios. The effects of C@SiO2 were evaluated by measuring the fluidity, thermal conductivity, phase change properties, temperature change, and compressive strength of various thermal storage cement-based materials. The results indicate that the newly designed thermal storage cement-based material with 10 vol% C@SiO2 increases the thermal conductivity coefficient by 63.6% and the latent heat of phase transition by 11.2% compared to common thermal storage cement-based materials. Moreover, C@SiO2 does not significantly impact the fluidity and compressive strength of the thermal storage cement-based material. This study suggests that C@SiO2 is a promising additive for enhancing thermal conductivity in thermal storage cement-based materials. The newly designed thermal storage cement-based material with 10 vol% C@SiO2 is a promising candidate for energy storage applications.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17122880