An innovative graphene-based phase change composite constructed by syneresis with high thermal conductivity for efficient solar-thermal conversion and storage  

作　　者：Jianqiang Wang Weijie Li Xinya Zhang 

机构地区：[1]School of Chemistry and Chemical Engineering,Guangdong Provincial Key Lab of Green Chemical Product Technology,South China University of Technology,Guangzhou 510640,China

出　　处：《Journal of Materials Science & Technology》2024年第11期179-187,共9页材料科学技术（英文版）

摘　　要：Graphene-based phase change composites hold significant potential for solar energy utilization,but their poor thermal conductivity hinders their practical applications.In this work,an air-dried graphene skele-ton(AGS)with excellent thermal conductivity enhancement efficiency was constructed by the ice tem-plating method and syneresis,and the air-dried graphene phase change composite(AGP)was subse-quently obtained through vacuum-impregnating n-Docosane(C22)into AGS.The syneresis effectively re-duced the phonon scattering between graphene sheets within AGS and increased the density of AGS to 0.1701 g/cm3.Therefore,with a graphene skeleton loading of 23.82 wt.%,AGP exhibited excellent thermal conductivity of 9.867 W/(m K),outstanding electrical conductivity of 68.08 S/cm,and remarkable shape stability.Additionally,AGP demonstrated a melting enthalpy of 188.5 J/g and an outstanding solar-thermal conversion efficiency of 93.98%,showing enormous potential for the utilization of solar energy.

关 键 词：SYNERESIS Graphene skeletons Thermal conductivities Phase change composites Solar-thermal conversion 

分 类 号：TB34[一般工业技术—材料科学与工程]