Details

Autor(en) / Beteiligte

• Zhu, Yirong
• Ji, Xiaobo
• Pan, Chenchi
• Sun, Qingqing
• Song, Weixin
• Fang, Laibing
• Chen, Qiyuan
• Banks, Craig E

Titel

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

Ist Teil von

• Energy & environmental science, 2013, Vol.6 (12), p.3665-3675

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 in the form of a CQD-based hybrid as an excellent electrode material for supercapacitors is reported for the first time. The CQDs are fabricated by a facile chemical oxidation method following which they are thermally reduced, and further decorated with RuO 2 to obtain the composites. The hybrid exhibits a specific capacitance of 460 F g −1 at an ultrahigh current density of 50 A g −1 (41.9 wt% Ru loading), and excellent rate capability (88.6, 84.2, and 77.4% of capacity retention rate at 10, 20, and 50 A g −1 compared with 1 A g −1 , respectively). Surprisingly, the hybrid shows exceptional cycling stability with 96.9% capacity retention over 5000 cycles at 5 A g −1 . Such remarkable electrochemical performances can be primarily ascribed to the significantly enhanced utilization of RuO 2 achieved by the efficient dispersion of tiny reduced CQDs and the formation of a CQD-based hybrid network structure that can facilitate the fast charge transport and ionic motion during the charge-discharge process. Additionally, the contact resistance at the interface between active materials and current collectors is concluded to be a key factor in determining the performance of the hybrid. These results above demonstrate the great potential of CQD-based hybrid materials in the development of high-performance electrode materials for supercapacitors. A new carbon quantum dot-based hybrid as an excellent electrode material for supercapacitors is firstly and successfully fabricated with the composite exhibiting excellent electrochemical performances.