Amorphous RuO2 coated on carbon spheres as excellent electrode materials for supercapacitors

作者：Zhou, Zhou; Zhu, Yirong; Wu, Zhibin; Lu, Fang; Jing, Mingjun; Ji, Xiaobo^*

来源：RSC Advances, 2014, 4(14): 6927-6932.

DOI：10.1039/c3ra46641h

• ELECTROCHEMICAL CAPACITORS
• METAL-OXIDES
• HYDROUS RUO2
• GRAPHENE
• BATTERY

Significant enhancement in supercapacitor performances was achieved by the first fabrication of amorphous RuO2 hybrid by utilising carbon spheres as templates. The as-prepared carbon spheres (Cs)/RuO2 and reduced carbon spheres (rCs)/RuO2 composites exhibit high specific capacitances of 387 F g(-1) (44.2 wt% RuO2 loading) and 614 F g(-1) (72.6 wt% RuO2 loading) at a current density of 1 A g(-1) at 2 mg cm(-2) loading mass, showing remarkable rate capability with capacitances of 336 F g(-1) and 491 F g(-1) at a current density of 20 A g(-1) and excellent cycling stability with capacity retention of 97.7% and 90.8% for 5000 cycles. The enhanced electrochemical performances could be attributed to the unique structure of the resulted composites as well as the high utilization of well-dispersed RuO2 nanoparticles on the carbon surface. These results demonstrate the great potential of carbon sphere-based composites in the development of high-performance electrode materials for supercapacitors.

• 出版日期2014
• 单位中南大学