Application Of Composite Materials Based On Cu-MOF-199 In Sensors And Capacitors

Cu-MOF-199 is a material with a typical"pocket-channel"structure whose pores are three-dimensional crossed squares with a higher porosity.Single-walled carbon nanotubes（SWCNTs）have excellent electrical and mechanical properties,and also have a high mobility for electrons and holes.Thermosetting phenolic resin is cheap and easy to obtain from synthetic raw materials.The synthesis method is safe and simple.The pore size and specific surface area of the material could be adjusted by foaming process and carbonization process.So,it becomes our preferred carbon source material.The graphene oxide（GO）contains a large amount of oxygen-containing functional groups,which can form various non-covalent bonding forces with other materials to guide structural change.The graphene obtained by the reduction of graphene oxide not only has a large specific surface area,but also has a high electron mobility,which can improve the electrochemical performance of the electrode material.Threecomposites,Cu-MOF-199/SWCNTs,Cu-MOF-199/PFand Cu-MOF-199/GO,were prepared based on Cu-MOF-199 in this work.The structure of the materials was characterized by SEM,FTIR,XRD and N₂ desorption experiments.And then,after the subsequent process,they were applied to electrochemicalsensors,electricdoublelayercapacitorsandFaraday pseudo-capacitors.The electrochemical properties of the materials were investigated by CV,DPV,CP,EIS and other electrochemical methods.The excellent electrode materials were prepared.First,the glassy carbon electrode was modified by the composite Cu-MOF-199/SWCNTs through dropping and electrodeposition to prepare an electrochemical sensor.The modified electrode was employed to detect the pollutants,catechol（CT）and hydroquinone（HQ）.Based on the excellent properties of Cu-MOF-199/SWCNTs,the electrochemical sensor exhibited superior performance.The detection range of HQ and CT was 0.1¹453μmol·L^-1(R_HQ=0.9999)and 0.1¹150μmol·L^-1(R_CT=0.9990),respectively.And the detection limits（S/N=3）of HQ and CT were 0.08μmol·L^-11 and 0.1μmol·L^-1,respectively.In addition,the prepared electrochemical sensors had good practical properties,and the recoveries of HQ and CT were 96.38¹01.9%and 96.52¹03.5%,respectively.The standard deviations（RSD）were within 5%.Then,the composite Cu-MOF-199/PF was prepared by doping a certain amount of Cu-MOF-199 into the phenolic resin.The effect of phenolic resin viscosity,material ratio and carbonization temperature on the properties of the composite was discussed.The porous composite Cu-Cu_xO/C-PF was prepared by foaming process and carbonization process.Cu-Cu_x O/C-PF was used as the electrode material for the electric double layer capacitor.When the viscosity of phenolic resin is 3.90 Pa·s（25℃）,the ratio of Cu-MOF-199 in phenolic resin is 4%and the carbonation temperature is 900℃,the prepared composite had the best performance and its BET specific surface area is 848.6 m²·g^-1,and the maximum specific capacitance is 229.60F·g^-11 at the current density of 0.1 A·g^-1.Finally,the graphene oxide was prepared by the modified Hummer method and the Cu-MOF-199/GO composite was synthesized by hydrothermal method.The ratio of raw material,carbonization temperature and other conditions were optimized.The porous composite Cu-Cu_xO-C/rGO was prepared by carbonization process and used as electrode material for the Faraday pseudo-capacitor.When the doping ratio of graphene oxide is 10%and the carbonation temperature is 700℃,the composite had the good electrical conductivity,a large BET specific surface area and the maximum specific capacitance of 1259.99 F·g^-1(current density 0.1 A·g^-1).