High Density of Free-Standing Holey Graphene/PPy Films for Superior Volumetric Capacitance of Supercapacitors.
作者： Zhimin Fan , Jianpeng Zhu , Xinghui Sun , Zhongjun Cheng , Yuyan Liu
关键词:
摘要: The volumetric performance is a vitally important metric for portable electronic and wearable devices with limited space. However, it contradictory the most supercapacitors in connection between gravimetric capacitances. Herein, we report simple strategy to prepare free-standing binder-free holey graphene/PPy film that possesses dense microstructure but still high own high-efficiency ion transport channels big ion-accessible surface area achieve high-powered supercapacitor electrodes, which have superior capacitance (416 F cm–3) (438 g–1) at 1.0 A g–1 6 M KOH electrolyte. Meanwhile, rate capability good cycling (82.4% retention even after 2000 cycles). Furthermore, energy density of assembled symmetric can show as 22.3 Wh L–1. Such densely packed free-s...
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