Controllable Synthesis And Electrochemical Property Study Of Three-dimensional Porous Structure Based On Copper Oxide Nanomaterials

Recent years,transition metal oxide has attracted increasing attention owing to its unique physicochemical properties.Research results suggest that the properties of transition metal oxide are closely related with the size,morphology,composition,and structure of the material.As the size of transition metal oxide reduces to nanoscale,a variety of new physicochemical properties will be activated,making transition metal oxide becoming an ideal option for the theoretical research and practical application of nanodevice.The CuO nanomaterial therein has been widely researched and applicated due to the advantages of high chemical stability,large specific surface area,low cost,multi-morphologic,and environmental friendliness.3D nanostructure is endowed with the stable structure,large specific surface area,and the capability of shortening ionic diffusion channel by providing more active sites and hierarchical porous channels.Thus,the electrochemical properties of nanomaterials can be effectively improved by 3D porous nanomaterial.In this study,the CuO nanomaterial with controllable morphology and mass,prepared using the simple and easily-operated hydrothermal method,is combined with3D porous nanomaterial to obtain a new material with corresponding electrochemical properties.This study includes the following contents and results:?1?Ultra-fine CuO nanoparticles embedded in three-dimensional graphene network nano-structure for high-performance flexible supercapacitorsWe develop ultra-fine CuO nanoparticles embedded in three-dimensional graphene network grown on carbon cloth?CuO/3DGN/CC?to construct a novel electrode material with advantages of high conductivity,large specific area and excellent redox activity for supercapacitor application.The CuO/3DGN/CC with different CuO mass ratios are utilized to fabricate supercapacitors and the optimized mass loading achieves the high areal capacitance of 2787 mF cm^-2 and specific capacitance of 1539.8 F g^-1 at current density of 6 mA cm^-2 with good stability?the capacitance retained 82.6%after1000 cycles?.In addition,a high-flexible solid-state symmetric supercapacitor is also fabricated by using this CuO/3DGN/CC composite.The device shows excellent electrochemical performance even at various bending angles indicating a promising application for wearable electronic devices,and two devices with area 2?4 cm² in series can light nine light emitting diodes for more than 3 minutes.These results indicating that the CuO/3DGN/CC structure has promising potential in flexible,wearable energy storage devices.?2?CuO nanoparticles combined with the?001?facet-dominated TiO₂ nanosheet arrays for enzyme-free photoelectrochemical glucose sensor.A?001?facet-dominated TiO₂ nanosheet array is firstly utilized as a scaffold for photoelectrochemical glucose sensing.A three-dimensional CuO/?001?TiO₂semiconductor heterojunction is fabricated on a carbon cloth by a two-step hydrothermal synthesis and its enzyme-free photoelectrochemical glucose sensing properties are studied in detail.With an optimized CuO mass loading,the composite achieves a maximum sensitivity of 5530.14?A mM^-1 cm^-2 to glucose,which is much higher than those sensors with the similar configurations reported previously.Moreover,the obtained composite also demonstrates a low detection limit of 0.2?M and an ideal linear range from 0.2 to 680?M.These excellent performances contribute to the?001?facet-dominated TiO₂ nanosheets provide highly active site for CuO decoration and glucose molecule absorption,and attribute to the effectively separation of photo-generated electron-hole pairs by the CuO/?001?TiO₂ heterojunction and excellent charge collection and shuttling characteristic of carbon cloth.We hope this work could provide a general strategy for semiconductor based enzyme-free photoelectrochemical biosensors.