Preparation Of MXene-based Fabric Triboelectric Nanogenerator And Its Applications In Self-powered Sensing

With the continuous development of science and technology,wearable electronic devices are more and more popular and concerned by people.They are also used more and more in sports rehabilitation,health monitoring,human-computer interaction and other aspects.The traditional battery energy used in wearable electronic devices has a short battery life and needs to be recharged repeatedly,resulting in a short cycle life and easy environmental pollution.The development of wearable electronic devices has been hindered to some extent by their disadvantages such as large volume,heavy weight,high rigidity,low capacity and short life.As a new energy collection technology,triboelectric nanogenerator is characterized by a wide range of materials,small size,light weight,low carbon and environmental protection.It can effectively collect various kinds of energy in the environment,such as wind energy,sound energy,tidal energy,human mechanical energy,etc.,and convert it into electric energy to directly power other devices.Moreover,triboelectric nanogenerator can respond instantaneously to mechanical stress stimulation,and its sensitivity is extremely high.The output electrical signal of triboelectric nanogenerator can reflect the change of mechanical stress,and it can be directly used as a sensor.Because of its air permeability,softness,washable and hygroscopic properties,traditional textiles are the first choice for people to wear closely.Therefore,in this paper,the traditional fabric and triboelectric nanogenerator are combined.Without affecting the advantages of lightweight and breathable fabric,wearable fabric based triboelectric nanogenerator is prepared to collect human mechanical energy and realize human energy management,gesture recognition,underwater rescue system and other applications.Firstly,the traditional fabric was modified by soaking in MXene solution to prepare negative MXene-based conductive fabric,which can be used as the friction layer and conductive layer of triboelectric nanogenerator at the same time.The triboelectric nanogenerator prepared by connecting wire with aluminum tape and MXene-based conductive fabric can effectively collect mechanical energy and convert it into electricity.By comparing the output under different fabrics,different drying methods and different soaking times,the triboelectric nanogenerator with the best output performance was selected based on the cotton fabric soaked in 3 mg/m L MXene solution for three times(the effective contact area was 5 cm×5 cm).The output voltage,current and charge are40 V,0.17 μA and 14 n C,respectively.Based on the MXene-based conductive fabric triboelectric nanogenerator,this paper realizes the application of energy collection,energy storage and energy supply,and realizes the human heat management.While passively hindering the diffusion of human heat energy,it can also actively heat up with electricity,maximizing the utilization rate of human energy.Besides,stretchable Modell cotton fabric is used as the substrate.By adding a conductive layer of silver nanowires between the electronegative MXene friction layer and the fabric substrate,the surface functional groups of MXene were selectively arranged,and a breathable,stretchable conductive fabric with high conductivity and surface electronegativity was constructed.By introducing silver nanowires,the output voltage,current and charge of Ag NWs-MXene-based conductive elastic fabric are increased from 35 V,0.45 μA,9 n C to 45 V,2.7 μA,16 n C.Based on this,we prepared Ag WS-MXene based conductive elastic fabric triboelectric nanogenerator,and studied its output performance under tensile state,under different contact areas,and before and after washing.Finally,the mechanical energy collection and sensing of human body are realized by using the elastic fabric friction nanogenerator,and the application of gesture recognition and underwater rescue system is constructed.