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A n-octadecane/hierarchically porous TiO2 form-stable PCM for thermal energy storage

Author

Listed:
  • Li, Chaoen
  • Yu, Hang
  • Song, Yuan
  • Wang, Meng
  • Liu, Zhiyuan

Abstract

For a phase-change material (PCM) confined in a porous structure, the interfacial interactions between the PCM and the porous skeleton are the decisive factors in latent heat storage performance. In this work, a novel composite PCM based on hierarchically porous TiO2 and n-octadecane was successfully synthesized. The porous TiO2 was prepared by a soft-template method, and the composite PCM was fabricated by introducing n-octadecane under vacuum. Transmission electron microscope and X-ray diffraction (XRD) results revealed that the as-prepared supporting matrix was crystalline TiO2, and N2 adsorption/desorption isotherms indicated that TiO2 has a hierarchically porous structure. For composite PCMs, Fourier transform infrared spectroscopy and XRD spectra revealed that no chemical bonds were formed between n-octadecane and TiO2. Scanning electron microscopy results showed abundant n-octadecane enclosed within the nanopores and closely bound on the surfaces of the hierarchically porous TiO2, as a result of capillary forces and interfacial tension. Porous TiO2 exhibited high adsorption for n-octadecane (50 wt%), and the relative enthalpy of the composite PCM was as high as 85.8 J/g. Compared with pure n-octadecane, the thermal conductivity of the as-prepared composite PCMs (e.g., 50 wt% n-octadecane sample) was improved by 138% with the addition of porous TiO2. After 800 melting/solidifying cycles, the composite PCMs exhibited excellent thermal reliability and high enthalpy. The influence of the TiO2 pore structure on n-octadecane crystallization behavior is shown in the results.

Suggested Citation

  • Li, Chaoen & Yu, Hang & Song, Yuan & Wang, Meng & Liu, Zhiyuan, 2020. "A n-octadecane/hierarchically porous TiO2 form-stable PCM for thermal energy storage," Renewable Energy, Elsevier, vol. 145(C), pages 1465-1473.
    • Handle: RePEc:eee:renene:v:145:y:2020:i:c:p:1465-1473
    DOI: 10.1016/j.renene.2019.06.070
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    Citations

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    Cited by:

    1. Rathore, Pushpendra Kumar Singh & Shukla, Shailendra kumar, 2021. "Improvement in thermal properties of PCM/Expanded vermiculite/expanded graphite shape stabilized composite PCM for building energy applications," Renewable Energy, Elsevier, vol. 176(C), pages 295-304.
    2. Tamilselvi, R. & Lekshmi, G.S. & Padmanathan, N. & Selvaraj, V. & Bazaka, O. & Levchenko, I. & Bazaka, K. & Mandhakini, M., 2022. "NiFe2O4 / rGO nanocomposites produced by soft bubble assembly for energy storage and environmental remediation," Renewable Energy, Elsevier, vol. 181(C), pages 1386-1401.
    3. Chen, Renjie & Huang, Xinyu & Deng, Weibin & Zheng, Ruizhi & Aftab, Waseem & Shi, Jinmin & Xie, Delong & Zou, Ruqiang & Mei, Yi, 2020. "Facile preparation of flexible eicosane/SWCNTs phase change films via colloid aggregation for thermal energy storage," Applied Energy, Elsevier, vol. 260(C).
    4. Liu, Changhui & Xiao, Tong & Zhao, Jiateng & Liu, Qingyi & Sun, Wenjie & Guo, Chenglong & Ali, Hafiz Muhammad & Chen, Xiao & Rao, Zhonghao & Gu, Yanlong, 2023. "Polymer engineering in phase change thermal storage materials," Renewable and Sustainable Energy Reviews, Elsevier, vol. 188(C).
    5. Ewelina Radomska & Lukasz Mika & Karol Sztekler, 2020. "The Impact of Additives on the Main Properties of Phase Change Materials," Energies, MDPI, vol. 13(12), pages 1-34, June.

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