Preparation Of Supercapacitor Electrode Material Tricobalt Tetroxide Particles And Study Of Its Properties

Among the transition metal oxides,cubic spinel Co₃O₄ is considered to be a potential supercapacitor material because of its ease of preparation,low cost of environment friendliness and relatively high specific capacitance.However,due to the poor conductivity?semiconductor properties?of the Co₃O₄ electrode material,the capacity decay in the charge and discharge process is more obvious,especially in the large magnification charge and discharge under the cyclical stability is poor,so the development of excellent electrochemical performance of the Co₃O₄ advanced functional materials have important significance.In recent years,the transition metal oxide electrode material directly grown on the current collector gradually attracts people's attention.During this way,it makes possible to avoid the use of inert auxiliary materials such as conductive acetylene black and binder during the electrode preparation process,so that the active material is in direct contact with the current collector,and the production method is simple and the obtained electrode material has good electrical conductivity.In this paper,the spinel-type Co₃O₄ active material was supported on foamed nickel,and its different reaction conditions were studied.The morphology and crystal structure were characterized by XRD and SEM.The electrochemical properties of the composites were tested.The main research work is as follows:?1?Co₃O₄ was prepared by different cobalt sources.The Co₃O₄ particles were prepared and characterized by XRD and morphology.The formation mechanism of Co₃O₄ was further studied.when the cobalt source is Co?NO3?2·6H2O,the NO2 gas will be released in the process of heat decomposition,making the formation of the three-dimensional Co₃O₄,which has a porous characteristic.In the case of CoCl2.6H2 O as a cobalt source,the two-dimensional chip Co₃O₄,which is produced,does not exist many pores.?2?In the experiment of carrying Co₃O₄ electrode material on foamed nickel by hydrothermal-thermal decomposition method,the obtained product was changed by controlling the variable,changing the reaction time of hydrothermal reaction,the concentration of cobalt ion at the time of reaction and the calcination temperature duringthermal decomposition The results show that the electrochemical performance of the product is good when the hydrothermal reaction time is 12 h,the concentration of cobalt ion in the solution is 0.04 mol / L and the calcination temperature is 500 ?.The preparation of Co₃O₄ nanoelectrode was carried out on the foamed nickel under the best experimental conditions,and its structural morphology was characterized and the electrochemical properties were tested.The results show that Co₃O₄ flake particles on the foamed nickel base have a specific capacitance of up to 580.10 F / g,and when the discharge current density is 4A / g,the specific capacitance can still be maintained at 95.703% Has excellent cycle stability.?3?The Co₃O₄/NiO composite electrode materials were prepared by solvothermal thermal decomposition method.The electrode materials were prepared in the presence of Co₃O₄ and Ni O ratio of 1:1,2:1 and hydrothermal reaction for 12 h and 24 h Preparation and electrochemical properties of the study.The results show that the electrochemical performance of Co₃O₄ electrode material is better than that of Co₃O₄/ NiO composite electrode.This may be due to the large size of the particle size of the composite materials,so further study is needed on how to improve the performance of composite materials.