Effect of Graphene Oxide on Phase Change Materials
Based on Disodium Hydrogen Phosphate Dodecahydrate for Thermal Storage
Posted on 2020-06-17 - 14:33
A novel composite phase change material
(PCM) for thermal energy
storage was prepared by adding graphene oxide (GO) to melted disodium
hydrogen phosphate dodecahydrate (DHPD, Na2HPO4·12H2O), which was then impregnated into expanded
vermiculite (EV). Because of the addition of GO, the contact angle
between melted DHPD and EV was decreased from 56 to 45°. The
maximum latent heat of the composite PCM without GO was 167 J/g, which
was improved to 229 J/g by adding 0.2 wt % GO. The phase change temperature
of the composite PCM was around 42 °C. The results from X-ray
diffraction, scanning electron microscopy, and contact angle tests
revealed that the improvement in thermal energy storage was achieved
because of the reduction of crystal water loss and the increased encapsulation
amount of salt hydrates. Thus, the thermal stability of the composite
PCM was improved by the addition of GO, which was demonstrated by
thermogravimetric analysis. The results of all analyses indicate that
the addition of a low weight fraction GO can promote the performance
of salt hydrates existing in EV.
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Huang, Kaiyue; Li, Jinhong; Luan, Xuezhu; Liu, Lijie; Yang, Zhiwei; Wang, Chengdong (2020). Effect of Graphene Oxide on Phase Change Materials
Based on Disodium Hydrogen Phosphate Dodecahydrate for Thermal Storage. ACS Publications. Collection. https://doi.org/10.1021/acsomega.0c01184