MoO2/a-CNT/rGO as electrode material for all-in-one flexible supercapacitor with integrated structure and function
DIAMOND AND RELATED MATERIALS(2024)
摘要
Flexible hydrogel based supercapacitors are ideal wearable energy storage devices due to their excellent power density, high charge/discharge efficiency. However, conventional laminated and sandwich structures could increase the interfacial contact resistance between the electrolyte and electrodes. Herein, a new all-in-one flexible supercapacitor with integrated structure and function was developed to avoid displacement and delamination during deformation and reduce the interface contact resistance. The all-in-one flexible supercapacitor is prepared from in situ synthesis and polymerization of MoO2/acidified carbon nanotubes (a-CNTs)/reduced graphene oxide (rGO) electrode materials into the PVA hydrogel. The unique freeze-thaw cycle method significantly enhances the integrity of the capacitor, making it exhibit enhanced specific capacitance (61.1 mF center dot cm(-2) at a current density of 0.2 mA center dot cm(-2)), excellent cycling stability (99.4 % capacity retention over 4000 cycles) and flexibility (243.3 % of tensile rate). Experimental and computational analyses probe into the root of the improvement of the electrochemical performance, confirming the significance of the 3D conductive network structure. This strategy furnishes a new reliable approach and paves the way for further study of flexible energy storage devices.
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关键词
MoO2/a-CNTs/rGO,Flexible supercapacitor,Freeze-thaw cycle method
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