Department of Chemistry, Tsinghua University, Beijing, People's Republic of China.
Phys Chem Chem Phys. 2011 Jun 21;13(23):11193-8. doi: 10.1039/c1cp20980a. Epub 2011 May 11.
2-Aminoanthraquinone (AAQ) molecules were covalently grafted onto chemically modified graphene (CMG), and the AAQ functionalized CMG sheets were self-assembled into macroporous hydrogels for supercapacitor electrodes. The electrode based on the AAQ modified self-assembled graphene hydrogel (AQSGH) showed a high specific capacitance of 258 F g(-1) at a discharge current density of 0.3 A g(-1), which is much larger than that of a pure graphene hydrogel (193 F g(-1)). Furthermore, the AQSGH electrode exhibited excellent rate capability and a long cycle life. This is mainly due to the covalently bonded AAQ moieties contributing additional redox capacitance. Furthermore, the highly conductive graphene hydrogel scaffold provided a large specific surface area for forming electric double layers and convenient routes for charge transfer and electrolyte diffusion.
2-氨基蒽醌（AAQ）分子被共价接枝到化学改性石墨烯（CMG）上，AAQ 功能化的 CMG 片自组装成用于超级电容器电极的大孔水凝胶。基于 AAQ 修饰的自组装石墨烯水凝胶（AQSGH）的电极在 0.3 A g(-1)的放电电流密度下表现出 258 F g(-1)的高比电容，比纯石墨烯水凝胶（193 F g(-1)）大得多。此外，AQSGH 电极表现出优异的倍率性能和长循环寿命。这主要是由于共价键合的 AAQ 部分贡献了额外的氧化还原电容。此外，高导电性的石墨烯水凝胶支架为形成双电层提供了大的比表面积，并为电荷转移和电解质扩散提供了方便的途径。
