Latent heat storage of phase change materials(PCMs)is expected to be a suitable method to enhance the absorption and conversion of solar energy because of their high heat storage density and excellent chemical stabili...Latent heat storage of phase change materials(PCMs)is expected to be a suitable method to enhance the absorption and conversion of solar energy because of their high heat storage density and excellent chemical stability.However,pure organic PCMs are limited by their low thermal conductivity,photothermal conversion,and thermal energy storage efficiency in practical applications.Herein,vertically oriented network composite PCMs are synthesized using reduced graphene oxide/MXene hybrid aerogels(r GO/MXene)as carrier materials and encapsulating stearic acid(SA)as the PCM.Because of the vertically aligned MXene and r GO hybridized backbones,the thermal conductivity of the composite reaches 1.21 W/(m K),which increases 317.24%,compared to SA.The melting enthalpy of composites reaches 168.25 J/g,which almost retains the melting enthalpy of pure SA.The addition of r GO and MXene significantly improves the photothermal conversion capability of composite PCMs(≤90.19%).Irradiating the oriented and non-oriented surfaces of the composite sample,it is found that the temperature rise is faster in the orientation direction than in the non-oriented direction,and the equilibrium temperature of the orientation direction is 4.8°C higher than that of the non-orientation direction.This new material has a high potential for use in solar energy storage applications because of its excellent performance.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 51876112)Project of Shanghai Municipal Science and Technology Commission (Grant No. 21010500600)+1 种基金Shanghai Engineering Research Center of Advanced Thermal Functional MaterialsGaoyuan Discipline of Shanghai-Materials Science and Engineering
文摘Latent heat storage of phase change materials(PCMs)is expected to be a suitable method to enhance the absorption and conversion of solar energy because of their high heat storage density and excellent chemical stability.However,pure organic PCMs are limited by their low thermal conductivity,photothermal conversion,and thermal energy storage efficiency in practical applications.Herein,vertically oriented network composite PCMs are synthesized using reduced graphene oxide/MXene hybrid aerogels(r GO/MXene)as carrier materials and encapsulating stearic acid(SA)as the PCM.Because of the vertically aligned MXene and r GO hybridized backbones,the thermal conductivity of the composite reaches 1.21 W/(m K),which increases 317.24%,compared to SA.The melting enthalpy of composites reaches 168.25 J/g,which almost retains the melting enthalpy of pure SA.The addition of r GO and MXene significantly improves the photothermal conversion capability of composite PCMs(≤90.19%).Irradiating the oriented and non-oriented surfaces of the composite sample,it is found that the temperature rise is faster in the orientation direction than in the non-oriented direction,and the equilibrium temperature of the orientation direction is 4.8°C higher than that of the non-orientation direction.This new material has a high potential for use in solar energy storage applications because of its excellent performance.
