Synthesis Of The Catalysts Based On MOFs And Their Lithium Air Battery's Performance

With the development of our society,energy has become an essential part of our life.Lithium air battery possesses the advantages of high energy density,cleaness,safety and excellent cycle performance,showing a good application prospect.Beside,metal-organic frameworks?MOFs?obtain many excellent advantages and have attracted great attention in electrocatalytic fields.In this paper,we attempt to apply catalysts based on MOFs in oxygen evolution reaction?OER?and oxygen reduction reaction?ORR?.Also,we develop air electrode and apply it in lithium air battery.Firstly,MCu-Co serial catalysts are synthesized by integrating Mes CuBTC with cobalt through impregnation method.The catalysts are characterized by XRD,FTIR,N2 adsorption/desorption,XPS and so on.The electrocatalytic acticities of the catalysts are tested by cyclic voltammetry,rotating disk electrode test.The MCu-Co-10 sample exhibits the best OER activity.The capacity of battery is 5602 mAh g^-1 at the current density of 50 mA·g^-1 and the stopping voltage of 2.0 V.The recycle numbers can reach 55 at the current density of 50 mA·g^-1 and the discharge capacity of 1000 mAh·g^-1,showing excellent charging performance.Secondly,Fe-N-C serial catalysts are synthesized by integrating ZIF-8 with MIL-10O?Fe?and the mixture is treated at 990 ? in N2 atmosphere.The Fe-N-C-1 sample exhibits the best ORR activity,which is superior to the ORR activity of 20 wt%Pt/C.The capacity of battery is 8757 mAh·g^-1 at the current density of 50 mA·g^-1 and the stopping voltage of 2.0 V,showing excellent discharging performance.Finally,FeCo-N-C serial catalysts are synthesized by integrating ZIF-8 with MIL-100?Fe?and ZIF-67,and the mixture is treated at 990 ? in N2 atmosphere.The overpotential ?E?the voltage difference between the voltageat 10 mA·cm-2 and initial voltage?is smallest and the value is 0.725 V.The capacity of battery is 9992 mAh·g^-1 at the current density of 50 mA·g^-1 and the stopping voltage of 2.0 V.The recycle numbers can reach 80 at the current density of 50 mA·g^-1 and the discharge capacity of 1000 mAh·g^-1.The battery based on FeCo-N-C-8 catalyst displays excellent charging and discharging performance,showing a good application prospect.