Preparation And Electrocatalytic Properties Of MoS₂ Composite Electrodes

Growing industrialization led to the rapid deterioration of water environment and insufficient energy supply,so the effective treatment of wastewater and the development of new energy sources is urgent.Molybdenum disulfide(MoS₂)has the advantages of a large number of active sites on the edge and higher ionic conductivity than oxides,which makes it has great potential in energy storage and advanced oxidation degradation of organic wastewater.The combination of MoS₂ and highly conductive carbon materials is an effective way to improve its easy aggregation,increase its stability and electrical conductivity.In this paper,MoS₂ is compounded with corn stalk-derived carbon and ZIF-8-derived carbon materials,the electrocatalytic activity and superelectric performance of the two composite materials are discussed,which provides an important basis for the use of MoS₂ in the fields of electrochemical advanced oxidation and supercapacitors.Using corn stover-derived carbon(CSDC)as a carbon source,MoS₂/CSDC composite materials are prepared by hydrothermal method.MoS₂ is spherical and uniformly dispersed on the surface of the sheet-like CSDC.The three-dimensional spherical structure better exposes the active sites of MoS₂.The MoS₂/CSDC material has abundant micropores and mesopores.At the same time,the coexistence and mutual conversion of Mo⁴⁺and Mo⁶⁺on the surface of the material facilitate the surface transfer of electrons,making it have excellent electrocatalytic activity.In the experiment of electrocatalytic degradation of phenol,the degradation rate of phenol reached 97.26%after 120 min.The removal rate of COD reached 88.00%after 180 min.At the same time,the MoS₂/CSDC material also has outstanding superelectric performance.When the current density is 1 A g^-1,the specific capacitance of the composite material is as high as 332.62 F g^-1.Using ZIF-8 derived carbon(ZDC)as the carbon source,the MoS₂/ZDC composite material is successfully synthesized by the hydrothermal method.MoS₂ nanosheets grow evenly and vertically on the surface of ZDC to form a unique dodecahedron structure,which greatly exposes the catalytic active sites at the edge of MoS₂ and ensures excellent electrocatalytic activity.The mesoporous structure formed after recombination helps to promote the electrolyte to penetrate into the pores and diffuse to the active site,enhancing the electrocatalytic activity.The composite material was used as the cathode material for electrocatalytic degradation of phenol.After 120 min,the degradation rate of phenol is as high as 98.75%.In addition,the removal rate of COD reached 90.31%after 180 min of degradation.