The Control Synthesis And Electrochemical Performance Of Monodispersed CoO

Looking for renewable energy to replace non-renewable energy(coal,oil,natural gas)has become the top priority.Lithium-ion batteries,because of clean,non-polluting,long life,and were widely used as energy storage devices in various fields.In recent decades,catalysts for oxygen reduction and evolution reactions are at the heart of renewable-energies technologies,such as fuel cells and water treatment.Despite tremendous efforts,looking for alternative precious metals,to reduce the cost of catalyst,has achieved obvious achievements,based on cheap transition metal while oxides with high stability,highly active electric catalyst design and development is still the research focus in the field of chemistry and materials.In this article,the monodispersed CoO nanoparticles with different morphologies were synthesised in different reaction system,on its surface structure,growth mechanism and electric catalytic activity were studied.In the oleyamine and cobalt nitrate system,adding a certain amount of silver nitrate,by adjusting the experimental parameters,monodispersed CoO nanocube with the size of less than 10 nm was synthesized.The growth mechanism and the formation mechanism of CoO nanocube are discussed,which provides the ideas of selective control for synthesising different directions.In the oleyamine system,the monodispersed CoO nanoparticles whose size are at the nanometer scale were synthesized by cobalt(Ⅱ)acetylacetone and cobalt(Ⅱ)nitrate,respectively.They were all used as the anode material of lithium-ion batteries,their performances were discussed after lithium electronic measurement.Test results show that pure CoO nanomaterials,although the first discharge rate is high,the material cycle and stability are poor,while the circulation and stability of the CoO/XC-72 material are significantly improved.In cobalt(Ⅱ)acetylacetonate and oleyamine system,the monodispersed CoO nanoparticle with the size of less than 5 nm were prepared by two methods.They were mixed with nitrogen doped reduction graphene oxide at a mass ratio of 3:2,the CoO/nitrogen doped reduction graphene oxide nanocomposites were prepared by ultrasonic loading.The supported complexes were used to catalyze the oxygen reduction reaction and the oxygen evolution reaction,respectively.Their catalytic performances were measured by rotating disk electrode test,The results show that: the composites(prepared by CoO nanoparticles synthesized in high temperature)’s limiting diffusion current is larger than the low temperature synthesised.