Prepatation Of Graphitized Carbon And Its Electrocatalytic Performance Study

At present,mankind is facing the severe problems of energy shortage and environmental pollution,so it is imperative to develop clean energy,and fuel cell is considered as the most promising environmental protection and efficient new energy.However,the performance of fuel cells is greatly limited due to the slow kinetic rate of cathodic oxygen reduction reaction.At present,the most effective cathode catalyst for fuel cells is platinum carbon.However,the large scale application of fuel cells is limited because of the scarcity of platinum resources,high price.Therefore,it is urgent to develop non-precious metal catalysts with abundant reserves,low price and excellent catalytic performance.graphitized carbon material has a good application prospect in the field of electrocatalysis because of its excellent charge conduction ability,chemical stability and great specific surface area.Therefore,in this thesis,graphitized carbon materials with three-dimensional structure and excellent catalytic performance were prepared by simple preparation method.The structure,morphology and electrochemical properties of graphitized carbon materials were studied in detail.The main contents and conclusions are as follows:3D graphitized carbon catalyst was prepared by one-step reduction method with lithium as reducing agent and carbon dioxide as carbon source.The prepared graphitized carbon has a three-dimensional flower-like structure.After electrochemical test,it was found that the graphitized prepared by reaction at 600?for 24 h showed the best catalytic performance of oxygen reduction:The initial potential,half-wave potential and limiting diffusion current density of the catalyst were 0.91 V,0.78 V and 5.66 mA cm^-2,respectively.The number of transferred electrons is close to 4,which is a typical four-electron reaction process.The product of oxygen reduction reaction is H₂O.In addition,the three-dimensional graphitized carbon catalyst showed better stability and methanol resistance than commercial platinum carbon.3D graphitized carbon catalyst was prepared by one-step reduction method with magnesium as reducing agent and carbon monoxide as carbon source.graphitized carbon has a unique three-dimensional structure of blocks/sheets combination,and has a large specific surface area and a uniform mesoporous structure.After electrochemical test,the graphitized carbon prepared by reaction at 850?with carbon monoxide for 6 h showed the best catalytic performance of oxygen reduction:The initial potential,half-wave potential and limiting diffusion current density of the catalyst were 0.94 V,0.81 V and5.92 mA cm^-2,respectively.The number of transferred electrons is close to 4,which is a typical four-electron reaction process,and the product of oxygen reduction reaction is H₂O.In addition,graphitized carbon catalyst showed better stability and methanol resistance than commercial platinum carbon.