| Lithium air battery with ultra-high specific energy density,is the future of chemical power in the most potential of green energy,lithium air battery is still in the laboratory research and development stage,you want to spread there are many problems to be solved,the most important part is Lithium air battery cathode catalyst,which directly affects the overall electrochemical performance of lithium-air battery.To make the performance of lithium-air battery battery better,cathode catalyst must meet the large enough surface area,there are enough porous structure,high catalytic activity.In this paper,hydrothermal method is used to synthesize the metal ion source with(CoNO3)2·6H20 as the metal ion source,2,5-dihydroxy-terephthalic acid(DHTA)as the organic ligand and DMF/ethanol as the organic solvent.The metal-organic framework has an ultrahigh specific surface area and a microporous structure,and is pyrolyzed into a three-dimensional system in a protective gas atmosphere.The carbon-intercalated porous Co/CoO cathode Catalyst,this synthesis method can well maintain its original three-dimensional porous structure,the catalyst for lithium-air battery ORR and OER process has a good catalytic effect,effectively reducing the charge and discharge process over-potential.The electrochemical performance of the Co/CoO catalyst was evaluated by controlling the temperature of the Co/CoO catalyst,and the electrochemical performance of the Co/CoO cathode was tested by comparing with the conventional Super P catalyst.The electrocatalytic performance of the catalyst was evaluated by the electrochemical method.The results show that the discharge capacity of the Li-air battery can reach 8019 mAh/g when the current density is 0.1 mA/cm2 and the cut-off voltage is 1.5 V.The cycle performance is as high as 70 laps,far higher than the traditional Super P catalyst 2450 mAh/g discharge capacity and 24 cycle.In this paper,the commercial XC-72 catalyst was mixed with acid to make it disperse even more,and the surface of the XC-72 catalyst had oxygen-containing functional groups and defective structure.These oxygen-containing groups and defective structures catalyzed the electrode reaction.The XC-72 catalyst was tested by electrochemical method before and after the mixed acid treatment.The results showed that the XC-72 catalyst could improve the discharge capacity,energy conversion efficiency and cycling performance of lithium air battery.The MnO2/XC-72 composite catalyst was successfully prepared by oxidizing Mn2+ to MnO2 on the surface of mixed acid-treated XC-72 by liquid-phase oxidation-reduction method.The prepared cathode catalyst not only possessed the catalytic merits of strong oxide,The electrocatalytic activity of the catalysts was evaluated by the electrochemical measurements of the MnO2/XC-72 catalysts prepared by controlling the loading of MnO2,and the electrochemical performance of the Li-air battery was tested.The MnO2/XC-72 composite catalyst prepared with the concentration of 0.4M manganese acetate has the best electrochemical performance.The discharge specific capacity is up to 1.5 V at a current density of 0.1 mA/cm2,discharge voltage of 4454 mAh/g,limiting capacity 600 mAh/g,can be recycled 49 laps.In this paper,MnO/C cathode catalyst was prepared by the template method,and the carbon source was used to produce the grapefruit skin in Fujian.It has a natural three-dimensional porous pore structure.This cathode catalyst is low in cost and relatively simple in preparation process,and green,the electrocatalytic activity of the MnO/C cathode prepared at 500? was also investigated.The results show that the MnO/C cathode prepared at 500? has good catalytic activity and high catalytic activity,which is the most popular preparation method.The catalyst exhibits the best electrochemical performance. |
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