Synthesis And Photocatalytic /Electrocatalysis Performance Of CoTe And Copper Based Composite Semiconductor Nanomaterials

With the rapid development of today's society,environmental pollution and energy consumption have become the main problems faced by human beings,especially the water pollution caused by organic dyes,which has restricted the sustainable development of industry and endangered human health and life.Therefore,sustainable energy production,conversion and storage technologies,such as water decomposition,carbon dioxide emission reduction,nitrogen reduction reaction,metal-air cell and fuel cell,have attracted more and more attention.Among these alternative"clean"energy technologies,photocatalysis and electrochemical decomposition of water are considered promising methods.As we all know,Nanocomposites with controlled compositions and structures have generated considerable interest for their distinguished properties,which find application in fields such as photonic crystals,catalysis,drug delivery,multifunctional probes,and supercapacitor electrodes,But the properties of nanomaterials are closely related to the morphology,structure,composition and size of the materials themselves.It is of great significance to develop a new synthesis method to construct nanomaterials with special structures to improve the properties and practical applications of the materials.In this paper,CoTe and copper-based composite semiconductor nanomaterials(Cu₂O,Ag@Cu₂O)with high quality and uniform morphology and size were synthesized by a simple one-step method,and their photocatalytic performance was systematically studied.The main contents are as follows:(1)In this work,We synthesized pure phase CoTe nanorods by one-step method.The results were characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),field emission scanning electron microscopy(FE-SEM),transmission electron microscopy(TEM,HRTEM)and other techniques.Electrochemical results showed that the prepared CoTe NRS was for the first time proved to be a highly efficient non-enzymic sensor for the electrochemical detection of glucose in alkaline solutions,and showed excellent OER activity close to that of industrial Ru O₂catalysts,as well as excellent performance in terms of power density,durability and circulation.(2)In this experiment,we prepared Cuprous oxide octahedron,cube,microsphere,hollow sphere and other micro and nano particles with uniform morphology by using a simple polyol reduction method.The formation mechanism of the product was preliminarily studied,and it was applied to the detection of non-enzymatic hydrolysis of glucose.The results were characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),field emission scanning electron microscopy(FE-SEM),transmission electron microscopy(TEM,HRTEM)and other techniques.The results show that the electrode has a good performance of glucose oxidation.Cu₂O nanomaterials with different morphologies have different catalytic activities for glucose oxidation(GOR)in alkaline solution,and Cu₂O octahedron shows the best biosensor performance.At the same time,the response time of all samples is relatively fast,and the anti-interference ability of a series of disturbance species such as Na Cl,UR,UA and AA is relatively strong.Because of these obvious advantages,these electrodes have broad application prospects in practical applications.(3)Core-shell nanostructures have attracted much attention because of their unique properties and wide application prospects.In this work,we mainly use Cu₂O as the template,using a one-step method to prepare Ag@Cu₂O core-shell structure composite material,and proved its photocatalytic performance,can work continuously under the light conditions.The composition,structure and morphology of the composites were investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),high resolution transmission electron microscopy(HRTEM)and X-ray photoelectron spectroscopy(XPS).Using rhodamine B(Rh B)and methyl blue(MB)as raw materials,the photocatalytic activity of rhodamine B was determined under visible light irradiation.The results show that,compared with pure Cu₂O,Ag@Cu₂O enhances the photocatalytic performance of the material.More importantly,Ag@Cu₂O also shows excellent photocatalytic performance and excellent reusability,which is very important for photocatalysis.Therefore,this study provides some insights for the degradation of organic pollutants,and the composite materials prepared have great application potential in actual wastewater treatment.