Design And Fabrication Of "Island Bridge" One-Dimensional Stretchable High Energy Density Hybrid Supercapacitor Arrays

Wire-shaped stretchable supercapacitors could be a promising candidate as the compatible energy supply unit for wearable electronics.However,great challenges still exist in simultaneously achieving the goals of high energy density,large elongation,stable electrochemical output,excellent integration capability and washability.Herein,a―rolled-up island-bridge（RIB）‖architecture design is demonstrated for fabricating novel wire-shaped stretchable micro-supercapacitor array（WSS-MSCA）to concurrently realize the above objectives.The acquired WSS-MSCA,consisting of rolled-up MXene//CNTs@PPy asymmetric MSC array serving as active islands interconnected by screen-printed semi liquid metal（LM）circuit functioning as conductive/stretchable bridges,can deliver a maximum linear/areal capacitance of 29.45 mF cm^-1/26.80 mF cm^-2,while functioning well in extreme deformations such as stretching to 100%strain,bending to 180°and twisting by 360°.Combined with an extended potential window up to 1.4 V,a high linear/areal energy density of 7.94μWh cm^-1/7.22μWh cm^-2 is further acquired.Most notably,the unique RIB electrode layout guarantees the outstanding integration capability of the MSC array,enabling on-demand output of the voltage/current with their convenient series/parallel interconnection via LM bridges and ensuring unprecedented adjustability to the whole electrochemical performance of the device.Moreover,the modular nature of the RIB architecture combined with the waterproof and stress-absorbing elastic silicone encapsulation matrix renders the WSS-MSCA excellent mechanical robustness and additional washability.The stable and controllable electrochemical output,excellent deformability and washability,combined with outstanding integration capability and proper length makes the WSS-MSCA promising compatible micro-power source for wearable microelectronics.