The Fabrication Of Cobalt-based Metallic Oxide Nanomaterials And The Study Of Its Electrocatalytic Properties

Since the beginning of the 21st century,energy and environmental problems have been more and more mentioned by people.The requirements on energy and environment have become increasingly high,and the search for a new type of environmentally friendly,efficient and cheap energy has been an urgent problem to be solved by the scientific research community.Metal air batterie is an ideal alternative energy source.Oxygen reduction reaction（ORR）and oxygen evolution reaction（OER）,as the two most important reactions in metal air battery,are the hot and difficult research in the field of metal air battery.Noble metal catalysts are recognized as highly effective catalysts,owever,due to its rarity and poor stability,metal air battery is difficult to achieve large-scale commercial production.Therefore,it is very meaningful to find a kind of electrocatalyst which is cheap,easy to obtain,high efficiency and stable.In recent years a large number of studies have made remarkable progress,but there are still many problems,such as the complicated preparation process,low production rate and the catalyst structure is not stable,performance is difficult to achieve expected effect,in addition,for different catalytic conditions of catalyst,the catalytic active site is not clear,the theoretical analysis,the complex could not form a unified theory,find the ultimate decision factors,and make the crucial for this study.In this work,we prepared a kind of the electrospun carbon fibers with uniform appearance and excellent performance by using the mature industrialized electrospinning technology,then acidified it,and prepared the nitrogen-doped electrospun carbon fiber supported by Co₃O₄ nanoparticles composite catalyst through a mature one-step hydrothermal reaction（Co₃O₄/N-ACCNF）.The preparation of the composite material of ORR/OER catalytic performance tests show that our preparation of the composite catalyst exhibited excellent electrical catalytic properties,it was found by test characterization that this bifunctional catalyst could provide faster electron transfer pathways and faster reaction kinetics for ORR/OER during catalytic reaction.It is a cheap transition group metal oxide catalyst with excellent performance and stability,which is expected to be used in commercial zinc air batteries.In addition,we prepared a kind of the three-dimensional porous structure of double metal oxide iron cobalt catalyst by hydrothermal reaction used in the study of rechargeable zinc air battery,electrochemical tests show that our preparation of the composite catalyst showed good catalytic performance,in alkaline conditions,when Co/Fe ratio is 1:1,the dual metal oxide catalyst showed the best catalytic performance.The analysis shows that the good porous structure and small particle size are the source of catalytic activity of the catalyst,and when the Co/Fe ratio is 1:1,the interaction between the bimetals can reach the best,showing the best bifunctional catalytic activity.