摘要
以氧化石墨烯(GO)为原料,采用胶体团聚法制备了还原氧化石墨烯气凝胶,再通过自扩散获得了还原氧化石墨烯气凝胶/二十烷(r-GO aerogel/eicosane)复合相变材料,研究了复合材料结构与性能的关系。采用热重分析仪(TGA)和差示扫描量热仪(DSC)测试了二十烷和复合材料的热性能,确认了二十烷质量分数与复合材料焓值的关系,探讨了相变循环次数对材料稳定性的影响。结果表明,复合材料的焓值与二十烷的质量分数成正比;经过50次相变循环后,二十烷的理论质量分数为95%的样品(PCM4)的储能性能仍然保持稳定。热导性能分析表明,还原氧化石墨烯气凝胶可以改善二十烷的热导率。此外,通过太阳光模拟测试计算出复合材料的光热转换效率为55%。
Reduced graphene oxide aerogel was prepared by colloidal agglomeration method from graphene oxide(GO). Then, reduced graphene oxide aerogel/eicosane(r-GO aerogel/eicosane) composite phase change materials were obtained through self-diffusion eicosane. The relationship between structure and performance of composites was investigated. Thermal properties of eicosane and composites were tested by TGA and DSC. The relationship between mass fraction of eicosane and enthalpy value of composites was confirmed. The effect of phase change cycles on the stability of composites was explored. The results showed that the enthalpy value of composites was directly proportional to the mass fraction of eicosane. After 50 phase change cycles, the sample with 95% theoretical mass fraction of eicosane(PCM4) still remained stable energy storage performance. The thermal conductivity analysis displayed that reduced graphene oxide aerogel could improve the thermal conductivity of eicosane. In addition, the light-to-thermal conversion efficiency of the composite was about 55% by sunlight simulation test.
作者
李军
陈人杰
谢德龙
谢于辉
朱远蹠
梅毅
LI Jun;CHEN Renjie;XIE Delong;XIE Yuhui;ZHU Yuanzhi;MEI Yi(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China;Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials,Kunming 650500,Yunnan,China;Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province,Kunming 650500,Yunnan,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2021年第5期947-953,共7页
Fine Chemicals
基金
国家自然科学基金(21663015,51603096)。
关键词
气凝胶
复合相变材料
热性能
光热转换效率
功能材料
aerogel
composite phase change materials
thermal properties
light-to-thermal conversion efficiency
functional materials
