Structural and Synthetic Modification of Graphitic Foams and Dendritic Graphitic Foams for Thermal Management
Structural and Synthetic Modification of Graphitic Foams and Dendritic Graphitic Foams for Thermal Management
复制标题
用于热管理的石墨泡沫和树枝状石墨泡沫的结构和合成改性
DOI：
10.1002/pssa.202100576
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Shi, Li
中科院分区：
文献类型：
--
作者：
Jia, Qianru;Liu, Yifei;Fan, Donglei Emma;Shi, Li
通过增加三维石墨网络与填充到孔空间中的功能材料之间的界面电荷或热传递，可以提高多孔石墨泡沫在柔性电子、电化学和热管理设备中的性能。本文研究了化学气相沉积(CVD)条件对网状泡沫镍制备的泡沫石墨和电沉积树枝状泡沫镍制备的树枝状泡沫石墨(DGFs)的结构和导热性能的影响。用体积分数小于1%的泡沫石墨(GF)制备了室温固体导热系数高达80 0 W m−1K−1的材料。相比之下，为强化界面换热提供了较大比表面积的DGF2·5 ± 0·2 W m−1K−1，尽管由于缺陷密度增加而折衷了约200 W m−1K−1，但由于其体积分数增加到了约5%，因此其有效导热系数达到了2·5 ±0·2 ·m−1K−1。通过对催化剂模板形貌和CVD条件的系统变化，揭示了催化剂表面曲率和石墨柱厚度在控制用于热管理的GFS和DGFs性能方面的不同作用。
The performances of porous graphitic foams in flexible electronic, electrochemical, and thermal management devices can be enhanced by increasing the interfacial charge or heat transport between the 3D graphitic network and the functional materials filled into the pore space. Herein, an investigation of the effects of chemical vapor deposition (CVD) conditions on the structure and thermal conductivities of both graphitic foams grown from reticular Ni foams and dendritic graphitic foams (DGFs) synthesized from electrodeposited dendritic Ni foams is reported. A room‐temperature solid thermal conductivity () up to 800 W m−1K−1is obtained from the graphitic foams (GF) with less than 1% volume fraction. In comparison, the DGFs, which provide a large increase of the specific surface area for enhanced interfacial heat transfer, achieve an effective thermal conductivity of 2.5 ± 0.2 W m−1K−1because of an enhanced volume fraction to about 5% despite a compromisedaround 200 W m−1K−1due to the increased defect density. Through systematical variations of the catalyst template morphology and CVD conditions, this work reveals the distinct roles of catalyst surface curvature and graphitic strut thickness in controlling the properties of GFs and DGFs for thermal management.