A carbon quantum dot decorated RuO2 network: outstanding supercapacitances under ultrafast charge and discharge

• DOI: 10.1039/c3ee41776j
• Publication Date: 2013-10-08T16:06:19Z
• Authors: Yirong Zhu; Xiaobo Ji; Chenchi Pan; Qingqing Sun; Weixin Song; Laibing Fang; Qiyuan Chen; Craig E. Banks
• Keywords: Hybrid material

Carbon quantum dots (CQDs) due to their unique properties have recently attracted extensive attention from researchers in many fields. In the present work, a new application form of CQD-based hybrid as an excellent electrode material for supercapacitors is reported first time. The CQDs are fabricated by facile chemical oxidation method following which they thermally reduced, and further decorated with RuO2 obtain composites. exhibits specific capacitance 460 F g−1 at ultrahigh current density 50 A (41.9 wt% Ru loading), rate capability (88.6, 84.2, 77.4% capacity retention 10, 20, compared 1 g−1, respectively). Surprisingly, shows exceptional cycling stability 96.9% over 5000 cycles 5 g−1. Such remarkable electrochemical performances can be primarily ascribed significantly enhanced utilization achieved efficient dispersion tiny reduced formation network structure that facilitate fast charge transport ionic motion during charge–discharge process. Additionally, contact resistance interface between active materials collectors concluded key factor determining performance hybrid. These results above demonstrate great potential development high-performance supercapacitors.