Nanotek Instruments, Inc.
Nano Lett. 2010 Dec 8;10(12):4863-8. doi: 10.1021/nl102661q. Epub 2010 Nov 8.
A supercapacitor with graphene-based electrodes was found to exhibit a specific energy density of 85.6 Wh/kg at room temperature and 136 Wh/kg at 80 °C (all based on the total electrode weight), measured at a current density of 1 A/g. These energy density values are comparable to that of the Ni metal hydride battery, but the supercapacitor can be charged or discharged in seconds or minutes. The key to success was the ability to make full utilization of the highest intrinsic surface capacitance and specific surface area of single-layer graphene by preparing curved graphene sheets that will not restack face-to-face. The curved morphology enables the formation of mesopores accessible to and wettable by environmentally benign ionic liquids capable of operating at a voltage >4 V.
一种基于石墨烯的电极超级电容器，在室温下的比能量密度为 85.6 Wh/kg，在 80°C 下的比能量密度为 136 Wh/kg（均基于总电极重量），在 1 A/g 的电流密度下进行测量。这些能量密度值可与镍金属氢化物电池相媲美，但超级电容器可以在几秒钟或几分钟内进行充电或放电。成功的关键是通过制备不会面对面堆叠的弯曲石墨烯片，从而能够充分利用单层石墨烯的最高固有表面电容和比表面积。弯曲的形态使形成介孔成为可能，这些介孔可被环境友好的离子液体润湿，离子液体可在 >4 V 的电压下工作。
