Highly Conductive and Porous Activated Reduced Graphene Oxide Films for High-Power Supercapacitors
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- 作者：Li Li Zhang ; Xin Zhao ; Meryl D. Stoller ; Yanwu Zhu ; Hengxing Ji ; Shanthi Murali ; Yaping Wu ; Stephen Perales ; Brandon Clevenger ; Rodney S. Ruoff
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：April 11, 2012
- 年：2012
- 卷：12
- 期：4
- 页码：1806-1812
- 全文大小：513K
- 年卷期：v.12,no.4(April 11, 2012)
- ISSN：1530-6992
文摘
We present a novel method to prepare highly conductive, free-standing, and flexible porous carbon thin films by chemical activation of reduced graphene oxide paper. These flexible carbon thin films possess a very high specific surface area of 2400 m2 g鈥? with a high in-plane electrical conductivity of 5880 S m鈥?. This is the highest specific surface area for a free-standing carbon film reported to date. A two-electrode supercapacitor using these carbon films as electrodes demonstrated an excellent high-frequency response, an extremely low equivalent series resistance on the order of 0.1 ohm, and a high-power delivery of about 500 kW kg鈥?. While higher frequency and power values for graphene materials have been reported, these are the highest values achieved while simultaneously maintaining excellent specific capacitances and energy densities of 120 F g鈥? and 26 W h kg鈥?, respectively. In addition, these free-standing thin films provide a route to simplify the electrode-manufacturing process by eliminating conducting additives and binders. The synthetic process is also compatible with existing industrial level KOH activation processes and roll-to-roll thin-film fabrication technologies.