摘要： In this research work, a three dimensionally (3D) interconnected porous polystyrene-carbon nanotubes (PS-CNT) polyHIPE foam was developed as a phase change material (PCM) sca?old for photo-to-thermal energy storage applications. Structural and thermal properties of the novel phase change composite were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, X–ray di?raction (XRD) spectroscopy, ultraviolet-visible di?used re?ectance spectroscopy, di?erential scanning calorimetry (DSC) analysis, and laser ?ash analysis. The para?n/PS-CNT composite containing 1 wt% CNTs exhibited a thermal conductivity as high as 0.39 Wm-1 K-1, 1.62 fold higher than that of pure para?n. The highly porous structure of the prepared foam led to a high PCM loading of 82.5%, a high latent heat of 119.3 J g-1 and a melting point of 56.88 °C. The prepared composite preserved its stable thermophysical properties after 100 melting/solidi?cation cycles. The enthalpy of para?n increased about 3.5% after in?ltrating into the PS-CNT polyHIPE foam. Further, the composite displayed excellent shape stability, which prevented the leakage of phase change material during phase transitions. Incorporation of carbon nanotubes in the polyHIPE foam led to black color of the composite leading to an increase in the light absorbance e?ciency and especially the light-to-thermal energy conversion e?ciency (90%).