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This paper showed two bio-based shape-stable composite phase change materials (PCMs) which were prepared through a convenient vacuum impregnation method. Lignin-based ordered porous carbon (LOC) was the porous supporting material, polyethylene glycol (PEG) and paraffin (PA) was the phase change substance in this work. The maximum loading of PCMs in the obtained LOC/PEG and LOC/PA are 70% and 75%, respectively, and their phase transition enthalpy (ΔH m ) are also as high as 81.5 J·g −1  and 88.5 J·g −1 , respectively. When the loading amount is the same as 60%, the thermal conductivity of LOC/PEG is 0.5029 W/mK, which is a 50.3% improvement over PEG. The thermal conductivity of pure PA is 0.3430 W/mK, and the thermal conductivity of LOC/PA is 0.5847 W/mK, an increase of 70.5% compared to paraffin. In addition, the obtained LOC/PA showed better thermal management capabilities and better thermal stability after infrared thermography tests compared to LOC/PEG. Considering the low cost and excellent properties, the obtained lignin-based ordered porous carbon composite phase change material has a promising future for practical applications in thermal energy storage.

Shape-stable composite phase change materials encapsulated by lignin-based ordered porous carbon for thermal energy storage