High-performance and long-term thermal management material of MIL-101Cr@GO

Here, we demonstrate a breathing-like passive thermal management material based on moisture adsorption and desorption of graphene oxide (GO) modified chromium (III) terephthalate metal organic framework (MIL-101Cr), which breaks the limitation of latent heat limitation of common phase change materials and is highly desirable for long-term heat dissipation of batteries and chips. Nanoscale MIL101Cr (50-100 nm) in-situ grown on the surface of GO (MIL-101Cr@GO) were prepared using a simple hydrothermal reaction method. In which, the MIL-101Cr acts as moisture adsorbent thus enables us to realize efficient heat dissipation through its moisture adsorption and desorption; while the GO acts as the nucleating agent for the growth of MIL-101Cr thus increases the nucleation rate and reduces the grain size of MIL-101Cr. As a result, the MIL-101Cr@GO shows high specific surface area and pore volume than that of pristine MIL-101Cr, resulting in higher moisture adsorption capacity and adsorption rate. In particular, the thermal management material MG6 (composed of MIL-101Cr and 6 wt% GO) shows a high moisture adsorption capacity of 1.391 g g(-1) (i.e., 1 g absorbent can absorb 1.391 g moisture), 35.44% higher than that of MIL-101Cr. The thermal management material MG6 achieves 9.0 degrees C temperature drop under 95% relative humidity for a ceramic heater with a heating power of 4 W (similar to a typical Li-ion battery), and keep at similar to 43.2 degrees C for at least 2 h. In addition, the material MG(6) can remain 95% moisture adsorption capacity after 144 h of continuous operation, showing good thermal management performance and stability. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The study demonstrates a passive thermal management material based on moisture adsorption and desorption of graphene oxide modified MIL-101Cr, which shows high efficiency in heat dissipation, with higher moisture adsorption capacity and adsorption rate. The material has great potential for long-term heat dissipation for batteries and chips.