Fatty amines/graphene sponge form-stable phase change material composites with exceptionally high loading rates and energy density for thermal energy storage

被引:139
作者
Chen, Tao [1 ]
Liu, Chao [1 ]
Mu, Peng [1 ]
Sun, Hanxue [1 ]
Zhu, Zhaoqi [1 ]
Liang, Weidong [1 ]
Li, An [1 ]
机构
[1] Lanzhou Univ Technol, Dept Chem Engn, Coll Petrochem Engn, Lanzhou 730050, Gansu, Peoples R China
基金
中国国家自然科学基金;
关键词
Phase change material; Fatty amine; Graphene sponge; Thermal energy storage; Thermal conductivity; MICROPOROUS POLYMER NANOTUBES; MECHANICAL STRENGTH; MONOLITHIC NANOFOAM; FABRICATION; CONDUCTIVITY; AEROGELS;
D O I
10.1016/j.cej.2019.122831
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The development of form-stable phase change materials (FSPCMs) with large latent heat, excellent thermal stability, and recyclability is essential for their practical applications for thermal or solar energy saving. Here, we first report the exploitation of fatty amines (FAs), in this case tetradecylamine (TDA) and octadecylamine (ODA), as novel organic phase change materials (PCMs) for fabrication of FSPCM composites with exceptional high energy density using porous 3D graphene sponge (GS) as porous supporting materials. The resulting fatty amines/graphene sponge composites (FAs/GS) show high latent heat of ranging from 293 kJ kg(-1) to 303 kJ kg(-1) and low supercooling degree of 7-9 degrees C. Surprisingly, it is found that the loading rate of these two FAs into GS is as high as 7063-10660 wt%, which is nearly three orders of magnitudes higher than that of most reported FSPCMs. In addition, compared with the FAs, the presence of GS results in an enhancement of thermal conductivity of FAs/GS. After 200 cycles of thermal cycling, the latent heat content of FAs/GS still remains as high as 93.34% (TDA/GS) and 93.83% (ODA/GS), implying an excellent thermal stability. Taking advantages of the merits mentioned above, the findings of this work would not only open a new way for exploiting the FAs as new high-performance organic PCMs, but also provide a possibility for construction of such FAs/GS with great potentials for real energy-saving applications based on their exceptional high energy density, low supercooling degree, unprecedented high loading value, excellent thermal stability and recycling capacity.
引用
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页数:9
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