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Discoloration performance and mechanism research of a novel thermochromic energy storage material

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  • Li, Min
  • Zhou, Si

Abstract

The combination of phase change materials and thermochromic materials can realize the purpose of changing color while storing energy, so as to play the role of temperature regulation and color warning. In this paper, a thermochromic energy storage material (TESM) was prepared by using crystal violet lactone (CVL) and cresol red (CSR) as color former and color developer each other, taking octadecanol (OD) as the solvent and the energy storage material. The phase transition of OD induces ring-opened and ring-closed of lactone in both CVL and CSR, further leading to better discoloration. The influence of different proportions on the discoloration effect was studied. The thermal properties and functional groups of the samples were characterized by differential scanning calorimetry (DSC), thermogravimetric analysis (TG) and Fourier transform infrared spectrometer (FT-IR). The discoloration and re-coloration mechanism were explored. The results showed that the color of the prepared TESM can reversibly change between yellow-green (at room temperature) and red (at high temperature). The discoloration is attributed to the change of the intermolecular force between OD and CSR caused by the solid-liquid phase transformation of OD. When m(CVL): m(CSR): m(OD) = 3:1:500 (B3), the color difference of the prepared TESM is 38.81 NBS and the melting enthalpy is 219.8 J/g. Moreover, the prepared TESM shows good thermal stability and thermal cycling performance, and it has broad application prospects in the field of temperature alert and control.

Suggested Citation

  • Li, Min & Zhou, Si, 2024. "Discoloration performance and mechanism research of a novel thermochromic energy storage material," Renewable Energy, Elsevier, vol. 225(C).
    • Handle: RePEc:eee:renene:v:225:y:2024:i:c:s0960148124004051
    DOI: 10.1016/j.renene.2024.120340
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    References listed on IDEAS

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    1. Geng, Xiaoye & Li, Wei & Wang, Yu & Lu, Jiangwei & Wang, Jianping & Wang, Ning & Li, Jianjie & Zhang, Xingxiang, 2018. "Reversible thermochromic microencapsulated phase change materials for thermal energy storage application in thermal protective clothing," Applied Energy, Elsevier, vol. 217(C), pages 281-294.
    2. Tang, Jia & Yang, Mu & Yu, Fang & Chen, Xingyu & Tan, Li & Wang, Ge, 2017. "1-Octadecanol@hierarchical porous polymer composite as a novel shape-stability phase change material for latent heat thermal energy storage," Applied Energy, Elsevier, vol. 187(C), pages 514-522.
    3. He, Yayue & Li, Wei & Han, Na & Wang, Jianping & Zhang, Xingxiang, 2019. "Facile flexible reversible thermochromic membranes based on micro/nanoencapsulated phase change materials for wearable temperature sensor," Applied Energy, Elsevier, vol. 247(C), pages 615-629.
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