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Na+ pre-intercalated Na0.11MnO2 on three-dimensional graphene as cathode for aqueous zinc ion hybrid supercapacitor with high energy density

It is a critical challenge to build electrochemical energy storage devices with both high energy density and remarkable power density. Although zinc ion hybrid supercapacitors (Zn-ion HSCs) with battery-type cathode and capacitor-type anode have attracted widespread attention, cathode materials possessing high stability and good electrical conductivity are still worth pursuing. Herein, Na+ pre-intercalated ?-MnO2 nanoflakes (Na0.11MnO2) were grown on three-dimensional graphene (3DG) by a facile electrodeposition method. Benefiting from the in situ growth of MnO2 on high-crystallinity graphene and Na+ pre-intercalation in layered ?-MnO2, the Na0.11MnO2/3DG electrode shows a superior specific capacitance of 1240?F?g?1 at the current density of 0.2?A?g?1 and excellent cycling stability with 90% capacitance retention after 9000 cycles in 2?M ZnSO4/0.2?M MnSO4 aqueous electrolyte. Moreover, the assembled Na0.11MnO2/3DG//AC Zn-ion HSCs device delivers superb energy density of 74.3?Wh kg?1 and high power density of 9.6?kW?kg?1, as well as satisfactory cycling lifespan with 83% capacitance retention after 5000 cycles. This work may pave a way for rational design of layer-structured MnO2 cathode in aqueous energy storage devices with both high energy and power densities.

» Author: Hao Ren, Lu Zhang, Jingyuan Zhang, Tianyu Miao, Ruiwen Yuan, Wenxiao Chen, Zhuo Wang, Junhe Yang, Bin Zhao

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