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MnO2 Nanoflowers Decorated on ZIF‐8‐ZnO with Ni Foam Supportfor High‐Performance Supercapacitors

Von Wiley-VCH zur Verfügung gestellt

A binder-free electrode was constructed by decorating MnO2 nanoflowers onto the hybrid material of ZIF-8/ZnO, as derived from ZIF-8 via pyrolysis. Both the composite electrode and the NF/ZIF-8-ZnO/MnO2//activated carbon (AC) asymmetric supercapacitor demonstrate excellent electrochemical performance, showing that NF/ZIF-8-ZnO/MnO2 is a promising candidate for supercapacitors due to the synergistic contribution of ZIF-8, ZnO and MnO2.


Abstract

In this study, ZIF-8 (Zn(MeIn)2, MeIn=2-methylimidazole) was synthesized directly on Ni foam with the use of polydopamine (PDA). By following a hydrothermal process, MnO2 nanoflowers were decorated on the hybrid material of ZIF-8/ZnO, as derived from ZIF-8 via pyrolysis at 500 °C under nitrogen flow. The produced binder-free electrode (NF/ZIF-8-ZnO/MnO2) demonstrated an excellent electrochemical performance for supercapacitors, including a specific capacitance of 2005 F g−1 at 2 A g−1 and a fairly high cycling stability (90.74% retention after 4000 cycles). Furthermore, a NF/ZIF-8-ZnO/MnO2//activated carbon (AC) asymmetric supercapacitor showed an energy density of 70.57 Wh kg−1 given a power density of 112.45 kW kg−1. These results demonstrate that NF/ZIF-8-ZnO/MnO2 is a promising candidate for supercapacitors due to the synergistic contribution of ZIF-8, ZnO and MnO2.

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