Enhanced mechanical, thermal, and electric properties of graphene aerogels via supercritical ethanol drying and high-temperature thermal reduction.
Enhanced mechanical, thermal, and electric properties of graphene aerogels via supercritical ethanol drying and high-temperature thermal reduction.
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DOI：
10.1038/s41598-017-01601-x
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发表时间：
2017-05-03
影响因子：
4.6
通讯作者：
Han W
中科院分区：
文献类型：
--
作者：
Cheng Y;Zhou S;Hu P;Zhao G;Li Y;Zhang X;Han W
具有高表面积、超低密度和导热性的石墨烯气凝胶已被制备出来，以开发其从污染吸附到储能、超级电容器和隔热等广泛应用。然而，机械性能低、热稳定性差和导电性差限制了这些气凝胶的应用。在本文中，我们通过水热还原和超临界乙醇干燥制备了具有大BET表面积、低热导率、高热稳定性和电导率的机械强度石墨烯气凝胶。 1500℃退火导致石墨烯气凝胶的热导率略有增加，机械性能、氧化温度和电导率进一步提高。较大的 BET 表面积以及强大的机械性能、低导热性、高热稳定性和导电性使这些石墨烯气凝胶成为电池、传感器、电极、轻质导体和绝缘材料等多个领域的可行候选者。
Graphene aerogels with high surface areas, ultra-low densities and thermal conductivities have been prepared to exploit their wide applications from pollution adsorption to energy storage, supercapacitor, and thermal insulation. However, the low mechanical properties, poor thermal stability and electric conductivity restrict these aerogels’ applications. In this paper, we prepared mechanically strong graphene aerogels with large BET surface areas, low thermal conductivities, high thermal stability and electric conductivities via hydrothermal reduction and supercritical ethanol drying. Annealing at 1500 °C resulted in slightly increased thermal conductivity and further improvement in mechanical properties, oxidation temperature and electric conductivity of the graphene aerogel. The large BET surface areas, together with strong mechanical properties, low thermal conductivities, high thermal stability and electrical conductivities made these graphene aerogels feasible candidates for use in a number of fields covering from batteries to sensors, electrodes, lightweight conductor and insulation materials.