专业从事离子液体的合成、应用及其相关技术的研究工作----Lanzhou Greenchem ILs/青岛奥立科

题名

[Wiley数据库][2013] Superior Micro-Supercapacitors Based on Graphene Quantum Dots

参考引用方式

Wen-Wen Liu , Ya-Qiang Feng , Xing-Bin Yan , Jiang-Tao Chen , Qun-Ji Xue. Adv. Funct. Mater. 2013, 23, 4111–4122

研究机构

中科院兰州化学物理研究所

所涉及离子液体

1-乙基-3-甲基咪唑四氟硼酸盐          143314-16-3

研究领域

超级电容器；石墨烯量子点；离子液体

论文摘要

Graphene quantum dots (GQDs) have attracted tremendous research interest due to the unique properties associated with both graphene and quantum dots. Here, a new application of GQDs as ideal electrode materials for supercapacitors is reported. To this end, a GQDs//GQDs symmetric microsupercapacitor is prepared using a simple electro-deposition approach, and its electrochemical properties in aqueous electrolyte and ionic liquid electrolyte are systematically investigated. The results show that the as-made GQDs micro-supercapacitor has superior rate capability up to 1000 V s−1, excellent power response with very short relaxation time constant (τ0 = 103.6 μs in aqueous electrolyte and τ0 = 53.8 μs in ionic liquid electrolyte), and excellent cycle stability. Additionally, another GQDs//MnO2 asymmetric supercapacitor is also built using MnO2 nanoneedles as the positive electrode and GQDs as the negative electrode in aqueous electrolyte. Its specific capacitance and energy density are both two times higher than those of GQDs//GQDs symmetric micro-supercapacitor in the same electrolyte. The results presented here may pave the way for a new promising application of GQDs in micropower suppliers and microenergy storage devices.

关键词

GQDs；Superior Micro-Supercapacitors; Ionic liquid