Preparation And Electrochemical Properties Of Cobalt Tetroxide@Silica/Carbon Nanomaterials

Metal oxide nanomaterials have ultra-small size advantages,unique physical and chemical properties,and higher application value than traditional metal materials.Therefore,the research on metal oxide nanomaterials is gradually deepening.The research process revealed the shortcomings of metal oxide nanomaterials,they are poor in stability,easy to agglomerate,and susceptible to environmental acid and alkali,when used alone.In order to solve this problem,the nanoparticles are compounded with a matrix material with high performance stability to achieve the purpose of protecting the particles and improving the applicability.Composite nanomaterial have attracted much attention in the field of nanomaterial due to their high specific surface area special structure and versatility.The preparation method of composite nanoparticles presented in this paper has great significance in scientific research and industrial applications.In this paper,the template method combined with the hydrothermal method is used to construct the Si-O-Si network using protonated amines.The composite nanomaterial,carbon layer coated silica-supported metal oxide nanoparticles,were successfully synthesized under near-neutral conditions.There are two main works as follows: First,a bromoacetic acid metal salt was synthesized as a precursor.APTES and TEOS were used as silicon sources to auto-catalyze the formation of a continuous Si-O-Si network in a water-alcohol neutral system,and calcined to obtain Co₃O₄@SiO₂.Then Co₃O₄@SiO₂ was coated with glucose as a carbon source by hydrothermal method,and finally K-Co₃O₄@SiO₂/C nanoparticles were obtained.This paper demonstrated the excellent electrochemical performance and cyclic stability of the material through performance testing,which proves that this preparation method can obtain a supercapacitor electrode materials with 419.94F·g-1 high specific capacitance at 1 A·g-1 current density and small resistance?ESR=0.77 ?,Rct=0.858 ??;we also researched the factors that affect the material to explore the material structure and performance.For the control,first we use the Co₃O₄@SiO₂ as a template,and use the functional group reaction between C6H12O6 and CH4N2S in the hydrothermal process to introduce N and S elements into the C layer to obtain hetero-element-doped K-Co₃O₄@SiO₂/C-N,S,and then explored the control results of the material by changing the hydrothermal time.Finally,by comparing the morphology test results and electrochemical data,the optimal conditions for the preparation of the material structure and properties were obtained.