期刊
RSC ADVANCES
卷 3, 期 7, 页码 2483-2490出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ra23283a
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资金
- Opening Foundation of Zhejiang Provincial Top Key Discipline [20121102]
- Public-benefit Foundation of Science and Technology Department of Zhejiang Province [2010C31112]
- Chinese University of Hong Kong
Asymmetric electrochemical capacitors (ECs) consisting of composites of reduced graphene oxide (RGO) and CoAl layered double hydroxide (LDH) as positive electrode, activated carbon (AC) as negative electrode (RGO/LDH//AC)and 6 M KOH solution as electrolyte were achieved. RGO/LDH was synthesized by a facile solution method in one step under mild conditions. Owing to its wide operating voltage window of 0-1.75 V and the utilization of RGO, the RGO/LDH//AC capacitor exhibited excellent electrochemical properties with a maximum energy density of 35.5 W h kg(-1), much higher than those of LDH//AC (25.1 W h kg(-1)) and AC//AC (6.3 W h kg(-1)) electrochemical capacitors. Moreover, the devices also showed a high power density of 8.75 kW kg(-1) and long cycle life of similar to 90% retention after 6000 cycles at the current density of 4 A g(-1). Such high-performance asymmetric electrochemical capacitors offer great promise in the application of energy storage systems.
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