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<p>Organic phase change materials (PCMs) are considered one of the critical thermal storage materials in medium and low-temperature solar thermal conversion and storage technologies. However, PCMs face challenges such as low photothermal conversion efficiency and liquid leakage, which significantly hinder their practical applications. This study developed a novel paraffin wax/3D graphene-Cu nanowire (PW/GCu) porous composite PCM. Copper nanowires (CuNWs) were embedded as thermal bridge within the GCu aerogel framework. The addition of copper nanowires markedly enhances the photothermal conversion performance and thermal conductivity of the composite material. Specifically, the thermal conductivity of PW/GCu<sub>1.5</sub> reached 0.85&#xa0;W·m⁻<sup>1</sup>·K⁻<sup>1</sup>, increasing by 347.3% compared to pure PW. The latent heat value reached 165.8&#xa0;J·g⁻<sup>1</sup>, approximately 90% of that of pure PW. After 100 thermal cycles, the enthalpy value decreased by only 1.17%. The leakage rate remained below 7%. Under a solar irradiance of 120&#xa0;mW·cm⁻<sup>2</sup>, the photothermal conversion efficiency of PW/GCu<sub>1.5</sub> reached 89.5%. Even after 200 photothermal cycles, it maintained excellent photothermal conversion efficiency and rapid thermal response behavior. This combined strategy offers a viable approach for fabricating structurally stable, highly absorbent, efficient heat conversion and storage materials, demonstrating significant application potential in solar thermal utilization.</p>

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3D network copper nanowires/graphene-encapsulated phase change materials for efficient solar energy storage

  • 期刊论文

  • 发表日期：

    2026年1月11日

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  • Jianguo Duan,
  • Xinyang Yu,
  • Kun Lei,
  • Yaxiong Wang,
  • Qing Ma,
  • Qihui Yu,
  • Xinsheng Li

摘要

Organic phase change materials (PCMs) are considered one of the critical thermal storage materials in medium and low-temperature solar thermal conversion and storage technologies. However, PCMs face challenges such as low photothermal conversion efficiency and liquid leakage, which significantly hinder their practical applications. This study developed a novel paraffin wax/3D graphene-Cu nanowire (PW/GCu) porous composite PCM. Copper nanowires (CuNWs) were embedded as thermal bridge within the GCu aerogel framework. The addition of copper nanowires markedly enhances the photothermal conversion performance and thermal conductivity of the composite material. Specifically, the thermal conductivity of PW/GCu1.5 reached 0.85 W·m⁻1·K⁻1, increasing by 347.3% compared to pure PW. The latent heat value reached 165.8 J·g⁻1, approximately 90% of that of pure PW. After 100 thermal cycles, the enthalpy value decreased by only 1.17%. The leakage rate remained below 7%. Under a solar irradiance of 120 mW·cm⁻2, the photothermal conversion efficiency of PW/GCu1.5 reached 89.5%. Even after 200 photothermal cycles, it maintained excellent photothermal conversion efficiency and rapid thermal response behavior. This combined strategy offers a viable approach for fabricating structurally stable, highly absorbent, efficient heat conversion and storage materials, demonstrating significant application potential in solar thermal utilization.