Preparation Of TiCN/C Electrode Materials And Characterization Of Supercapacitors

Recently,as a new type of energy storage device,ultracapacitors with the characteristics of both rapid charging and discharging of traditional capacitors and energy storage of batteries can solve the bottleneck caused by the shortage of traditional energy storage batteries in many fields and have broad application prospects.It is generally believed that the electrochemical performance of supercapacitors is limited by many factors,such as electrode material,electrolyte membrane and packaging technology,among which the type,composition and structure of electrode material play a decisive role in the electrochemical performance of supercapacitors.TiCN/C and its composites are considered as one of the supercapacitor electrode materials with high power density properties among various materials reported in the current study.,however,usually adopt the synthesis methods of often require stringent process conditions?temperature,>1000°C?and complex process steps,and limits the TiCN/C mass preparation and application of composite materials.In this paper,titanium dioxide nanotubes were directly nitrogenated to obtain titanium carbonitride?TiCN?materials,and their physical and chemical properties and capacitance characteristics were studied.On this basis,flexible supercapacitors with excellent performance were successfully prepared,which proved the practicability of this material.In this work,the main results are summarized as follows:1.a direct solid state carbonitridation of Titania nanotube at the relatively lower temperature of 900°C to prepare carbon anchored TiCN as electrode material for supercapacitor.The prepared sample is highly conductive and porous,in favor of fast electron transfer and ion transport,ensuring high rate capability.The carbon anchored TiCN based electrode shows an outstanding capacitive performance,achieving a high capacitance of 360 F g^-1 at 0.5 A g^-1,and an impressive capacitance of 126 F g^-1 at ultrahigh 150A g^-1,as well as long cyclic capability?>10000 cycles?in 1 M H₂SO₄.2.Based on the excellent performance of TiCN electrode material,a flexible tape-shaped H₂SO₄/PVA solid-state symmetric supercapacitor was fabricated to demonstrate its practicality.With outstanding flexibility of 180°C bending,Its electrochemical properties are still good.Respectively,as well as excellent cyclic capability?⁹0%capacitance retention after 10000 cycles?.The above results show that TiCN/C and its composite materials with good performance and practicality were prepared by a simple and environmentally friendly synthesis method with relatively mild process conditions,providing experimental reference for the preparation of electrode materials for supercapacitors.