Ultra-Fine Ruthenium Oxide Quantum Dots/Reduced Graphene Oxide Composite as Electrodes for High-Performance Supercapacitors
Jie Zhao,
Jianmin Zhang,
Hang Yin,
Yuling Zhao,
Guangxu Xu,
Jinshi Yuan,
Xiaoyao Mo,
Jie Tang,
Fengyun Wang
Affiliations
Jie Zhao
College of Physics, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China
Jianmin Zhang
National Engineering Research Center for Intelligent Electrical Vehicle Power System, College of Mechanical and Electrical Engineering, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China
Hang Yin
College of Physics, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China
Yuling Zhao
State Key Laboratory of Bio Fibers and Eco Textiles, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China
Guangxu Xu
College of Physics, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China
Jinshi Yuan
College of Physics, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China
Xiaoyao Mo
College of Physics, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China
Jie Tang
National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 3050047, Japan
Fengyun Wang
College of Physics, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China
This study synthesized ultra-fine nanometer-scaled ruthenium oxide (RuO2) quantum dots (QDs) on reduced graphene oxide (rGO) surface by a facile and rapid microwave-assisted hydrothermal approach. Benefiting from the synergistic effect of RuO2 and rGO, RuO2/rGO nanocomposite electrodes showed ultra-high capacitive performance. The impact of different RuO2 loadings in RuO2/rGO nanocomposite on their electrochemical performance was investigated by various characterizations. The composite RG-2 with 38 wt.% RuO2 loadings exhibited a specific capacitance of 1120 F g−1 at 1 A g−1. In addition, it has an excellent capacity retention rate of 84 % from 1A g−1 to 10 A g−1, and excellent cycling stability of 89% retention after 10,000 cycles, indicating fast ion-involved redox reactions on the nanocomposite surfaces. These results illustrate that RuO2/rGO composites prepared by this facile process can be an ideal candidate electrode for high-performance supercapacitors.
