4.7 Article

Novel properties of stearic acid/MXene-Graphene oxide shape-Stabilized phase change material: Ascended phase transition temperature and hierarchical transition

Journal

SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 247, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.solmat.2022.111948

Keywords

Phase change material; Photothermal conversion; Confinement effect; Ascended phase change temperature; Hierarchical transition

Funding

  1. Lanzhou Innovative and Entrepreneurial Project of Talent Personnel, China [2020-RC-33]
  2. Industry Supporting Project for Gansu Institution of Higher Learning, China [2021CYZC-10]

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A shape-stabilized phase change material was developed using a self-assembly method. The material consisted of stearic acid confined between graphene oxide and MXene nanosheets. The material exhibited higher primary melting temperature and lower total latent heat compared to pure stearic acid. It also showed excellent photothermal conversion efficiency and gradient latent heat storage capacity.
To develop novel materials with active photothermal conversion and latent heat storage properties, the shape-stabilized phase change material was fabricated via self-assembly method employing stearic acid (SA) as heat storage medium, graphene oxide and MXene as hybrid matrix (GM) and photothermal conversion agent. The morphology, structure, properties and phase transition behavior were investigated by various techniques. The results shown that SA/GM has sandwich-like structure and SA is confined between matrix nanosheets in multiple crystallographic forms. Due to the superposition of host-guest interaction and intrinsic van der Waals force between nanosheets, the primary melting temperature of SA/GM climbs 27.7 ?C approximately than that of SA, as well as the total latent heat decreases by 28.55%-30.85% compared with theoretical values. The confinement effect increases the crystallization activation energy of confined SA, and leads to the formation of non-phase transition layer, transitional confinement layer and proximate bulk layer. However, the above observations are applicable to fatty acids/GM, only the suppressed latent heat occurs in all GM-matrix composites. In addition, the SA/GM7 has excellent photothermal conversion efficiency, as high as 93.34%, and gradient latent heat storage capacity, 45.96 J g(-1) at 74.43 ?C and 91.19 J g(-1) at 92.37 ?C.

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