Abstract:
Energy storage technology can solve the contradiction between energy supply and demand in time and space and thus improve energy utilization efficiency. As a potential heat storage technology,phase change heat storage is widely used in solar energy,energysaving buildings,industrial waste heat recovery and thermal management systems. Its heat storage medium is phase change materials(PCMs) which mainly include solidsolid PCMs and solidliquid PCMs. The PCMs can achieve the dual purposes of heat storage and temperature control due to their large latent heat and constant phase change temperature. Solidliquid PCMs are a kind of phase change materials that are widely studied. They have the advantages of highenergy storage density,adjustable phase change temperature,stable chemical properties and low price. However,the application of solidliquid PCMs is hindered by liquid leakage during phase change,low thermal conductivity and phase separation. Those problems can be solved by introducing porous materials into solidliquid PCMs. Particularly,the shapestabilized PCMs prepared with porous carbon matrix exhibit enhanced mechanical strength,improved thermal conductivity,excellent encapsulation and stability. This review systematically summarizes the research progress of porous carbonbased shapestabilized PCMs. The effects of the pore structure,surface modification,mass fraction and intermolecular force of expanded graphite,carbon nanotubes,graphene oxides and biological porous carbon on the shapestabilized capacity,thermal performances and phase change behaviors of shapestabilized PCMs are analyzed. Meanwhile,the performances of shapestabilized PCMs prepared with other porous carbon matrices are discussed,such as active carbon,carbon foam and carbon nitride. The research status on the application of porous carbonbased shapestabilized PCMs is also introduced. At last,by comparing the main performances and different advantages of shapestabilized PCMs prepared with different porous carbon matrix,some suggestions for material selection in the application are put forward. Also,the future research topics are outlined