Integrated Design And Application Of Flexible Supercapacitor And Sensor

The rapid development of wearable electronic devices has put forward higher demands for the miniaturized and multi-functional electronics.In recent years,research on integrated device systems for wearable electronics has become a hot spot.Integrated devices can be divided into three parts according to their functions:production unit,energy storage unit and sensor unit.The energy storage unit is mainly composed of ion batteries or supercapacitors,and the sensing unit usually includes strain sensors,light sensors or temperature sensors with a wide range of application scenarios.Traditional integrated systems are built on hard substrates such as integrated circuits,and hard substrates are not conducive to the wearing comfort of the device,and it is difficult to meet the requirements for functions such as sensor devices.The carbon nanotube（CNT）film has the advantages of high flexibility,long life,high energy density,and better interface compatibility.Therefore,we choose carbon nanotube film as the growth substrate of the electrode material.The metal-organic framework precursors are used to construct supercapacitors and functional sensors of different new types of active materials to meet the demands of increasingly developed integrated systems for energy storage performance and high-efficiency sensing.From the perspective of the growth of electrode materials,the preparation and performance research of energy storage devices and sensor devices,the purpose of this paper is to study and prepare integrated devices with excellent performance.In the growth of electrode materials,derivatives based on metal-organic framework materials are mainly selected as active materials to prepare and study their applications in energy storage devices and sensor devices.In terms of the construction and research of integrated devices,different types of energy storage devices and sensor devices are mainly prepared by using laminated structures.The two devices are connected through a simple process,and the performance and potential applications of integrated devices have been successfully prepared and studied.Wait.The main research results are as follows:（1）Asymmetric supercapacitors were constructed based on Ti@Co₃O₄ electrode materials,and Ti@Zn O electrode materials were used to fabricate photo-responsive sensors and integrated devices for electrochemical performance research.Co（OH）₂ was grown in situ on the titanium wire by hydrothermal method and then annealed to obtain flower-like Co₃O₄nanosheets.After using three electrodes to study the electrochemical properties of the material,an asymmetric supercapacitor was formed with Ti@Fe₂O₃ to successfully drive the photo-responsive sensor constructed by Zn O,so that the photo-responsive sensor can generate current response to light of different wavelengths.It proves that the integrated system has certain energy storage conversion and good performance in optical sensing.（2）Construct flexible asymmetric supercapacitor based on Zn Se/Co Se₂ composite electrode material and CNT@r GO electrode material to prepare flexible strain sensor and form an integrated device for electrochemical performance research.The Zn Co-MOF precursor material was grown in situ on the carbon nanotube film by stirring at room temperature,and the Zn Se/Co Se₂ composite electrode material was obtained after selenization by hydrothermal method.The three-electrode test proved that the material has excellent electrochemical performance after selenization.This material and acid-activated carbon nanotube film（ECNT）form an asymmetric supercapacitor.The strain sensor constructed by CNT@r GO and pure CNT film was successfully driven and the current response to the strain stimulus changed.It shows that the integrated system has good energy storage conversion and excellent sensing performance.（3）Construct flexible symmetrical supercapacitors and flexible strain sensors based on Co-NCNT@MXene composite electrode materials and form integrated devices for electrochemical performance research.The Ti₃C₂T_x material is prepared by hydrofluoric acid etching.ZIF-8 and ZIF-67 were grown in two steps on Ti₃C₂T_x powder by stirring at room temperature,and finally Co-NCNT@MXene powder material was obtained by annealing in a tube furnace.The material is fixed on the CNT film by the coating method to obtain a composite electrode.The flexible symmetrical supercapacitor constructed by the composite electrode has good charge-discharge cycle performance and mechanical stability.The flexible dual-mode sensor constructed by the composite electrode can respond well to strain and pressure respectively.The integrated device can respond to a series of motions on the human body,such as fingers,pulse,swallowing,etc.,and can also output Morse code signals for pressure in the vertical direction.It has realized the use of a single electrode material in two modes of energy storage and sensing,as well as the practical application of the integrated system,showing the potential of a single electrode material to have multiple application scenarios at the same time.