Science and Technology on Advanced Composites in Special Environment Laboratory, Harbin Institute of Technology, Harbin, 150080, People's Republic of China.
Sci Rep. 2017 May 3;7(1):1439. doi: 10.1038/s41598-017-01601-x.
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.
具有高比表面积、超低密度和热导率的石墨烯气凝胶已被制备出来，以从污染吸附到储能、超级电容器和隔热等方面广泛应用。然而，低机械性能、差的热稳定性和电导率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 比表面积、低热导率、高热稳定性和高电导率的机械强度高的石墨烯气凝胶。在 1500°C 下退火导致热导率略有增加，并且进一步改善了石墨烯气凝胶的机械性能、氧化温度和电导率。大的 BET 比表面积，以及优异的机械性能、低热导率、高热稳定性和电导率使得这些石墨烯气凝胶成为从电池到传感器、电极、轻质导体和绝缘材料等多个领域的可行候选材料。
