| With the development of customer electronics toward being portable,miniaturized and flexible energy storage devices have to be designed and fabricated to meet the requirements of market.Flexible supercapacitors,as one type of flexible energy storage devices,have shown excellent long cycle life,high power density,good environmental friendliness,and high safety.For the development of high-performance flexible supercapacitors,special attention should be paid to the electrochemical,mechanical,and interfacial properties of the flexible electrodes.Here we present the design and fabrication of two new flexible solid-state supercapacitors based on metallic fabrics with high specific capacitance.We firstly report the stainless steel fabrics(SSF)as the current collector for high-performance graphene-based supercapacitors.The SSF has superior properties with excellent conductivity,good mechanical flexibility and high electrochemical stability.The flexible supercapacitors show large specific capacitance of 180.4 mF/cm2(1 mA/cm2),and capacitance retention of 96.8%after 7500 charge-discharge cycles.Furthermore,96.4%of the capacitance is retained after 800 bending cycles.However,the double-layer capacitance originated form graphene is much lower than the pseudocapacitance of conductive polymers.Therefore,in order to obtain a high capacitance performance,we report a simple process to obtain hybrids consisting of graphene and polyaniline,and assemble them into supercapacitors.The supercapacitor exhibited a large specific capacitance of 1506.6 mF/cm2(6 mA/cm2).The bending tests showed that the supercapacitor maintained high mechanical flexibility and high capacitance simultaneously,after 1000 bending cycles,the capacitance of the device remains 95.8%of the original value.We believe such all-solid-state supercapacitors with SSF as the current collector will boost the development of highly flexible and wearable electronics and integrated fabric power devices. |
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