Preparation And Application Of Cobalt-Based Materials

The development of electrochemistry provides many effective methods for solving atmospheric pollution and new energy sources.The electrocatalytic treatment of gaseous pollutants and high-performance electrode has become a hot topic in modern scientific research.Spherical Co₃O₄,CoCO₃,MnCO₃ and their carbon composites and Co₃O₄/Co Mn₂O₄ were prepared by solvent method.The flake,cottonwool Co₃O₄ and their carbon composites were prepared by solvothermal thermal-decomposition.The composition and structure of materials were characterized by XRD,SEM and BET,et al.The electrocatalytic properties of the material were characterized by NO_x conversion rate.The electrochemical properties and reaction mechanism of materials were characterized by cyclic charge and discharge,CV,et al.The spherical Co₃O₄ and flake Co₃O₄ were used as catalysts to adhere to the surface of AC.The effect of mass ratio of catalyst to AC on the conversion rate of NO_x was studied.The conversion rate showed a parabolic distribution.15 wt%flake Co₃O₄,at 200°C,1.5 V,0.02 A,has a NO_x conversion rate of 84%,which is superior to the spherical Co₃O₄,because of the large specific surface area.The spherical Co₃O₄,flake Co₃O₄ and cottonwool Co₃O₄ as anode of lithium ion batteries exhibit electrochemical activities.At 100 m A·g^-1,100 cycles,the cottonwool Co₃O₄ exhibited a discharge specific capacity of 463 m Ah·g^-1,which is superior to the others.The properties of the cottonwool Co₃O₄/MWCNTs are more excellent.100 m A·g^-1,100 cycles,the specific discharge capacity is 732.4m Ah·g^-1.Corn-like CoCO₃ was prepared by solvothermal method with CoCl₂·6H₂O.As a new structure of CoCO₃,the corn-like structure can buffer the volume change during charge and discharge.At 100m A·g^-1,after 100 cycles,the discharge specific capacity of was 702 m Ah·g^-1.The self-assembled hierarchical MnCO₃ was prepared by solvothermal method with KMnO₄.The composite prepared with HC exhibited excellent electrochemical performance.At 100 m A·g^-1,after100 cycles the discharge specific discharge capacity was 864 m Ah·g^-1.On this basis,Co₃O₄/CoMn₂O₄was successfully prepared as a new type of lithium ion batteries anode materials anode at 100 m A·g^-1,the specific capacity of discharge was 248 m Ah·g^-1 after 100 cycles.Figure 63;Table 6;Reference 96.