Study On The Modification Of Manganese-Based Cathode Materials For Aqueous Zinc-Ion Batteries

In this paper,the synthesis of 3D graphene and its composites with other semiconductors and MOFs is studied,and using scanning electron microscopy,transmission electron microscopy,X-ray diffractometer,UV-vis spectrometer,Fourier transform infrared spectroscopy,specific surface area,mass spectrometer and X-ray photoelectron spectroscopy.The adsorption and photocatalytic activity of these materials for degradation of wastewater pollutants,such as rhodamine blue,methylene blue（MB）,acridine orange（AO）,atenolol,tetracycline（TC）,and reduced Cr（Ⅵ）,were investigated.In addition,the adsorption and degradation pathways of these potential water pollutants were thoroughly investigated and the corresponding mechanisms were proposed.The main content of the paper is as follows:Reduced graphene oxide（CuS-NS）decorated with mesoporous CuS nanospheres was successfully prepared by chemical reduction method.The specific surface area and porosity of the synthesized samples were determined by Brunuer-Emmet-Teller（BET）,and the morphological and structural properties of the samples were investigated using transmission electron microscopy（TEM）and scanning electron microscopy（SEM）.The experimental results showed that CuS nanospheres were induced to form and dispersed on the three-dimensional network of reduced graphene（3D rGO）,forming CuS-NS/3D rGO composites.We further evaluated the synergistic removal of cationic dyes and Cr（Ⅵ）by this composite.By studying the reduction of Cr（Ⅵ）and the degradation of cationic dyes under visible light,it was found that the CuS-NS/3D rGO composite exhibited excellent photocatalytic activity,which was better than that of CuS nanospheres.To adsorb potential water pollutants,we successfully fabricated a novel three-dimensional porous graphene（3D PG）.A novel three-dimensional porous graphene framework was prepared by a simple carbonization process at 700°C using maleic acid as a carbon source.Sodium carbonate was used as the skeleton substrate for three-dimensional PG.Na₂CO₃ releases carbon dioxide gas during the reaction,thus forming a three-dimensional porous graphene network.Characterization by Raman spectroscopy,SEM,TEM,and FT-IR confirmed that the as-prepared novel 3D PG had properties similar to those of 3D porous graphene.In addition,this unique porous structure enables 3D PG to possess a high surface area(567.56 cm² g^-1),and the adsorption capacities for atenolol and RhB are433.3(mg g^-1)and 642.5(mg g^-1),respectively.Cobalt oxide（CoO）and three-dimensional porous graphene（3D PG）composites were successfully prepared by tube furnace calcination,and their photocatalytic behavior under visible light irradiation was investigated for the removal of pollutants in wastewater.The composites were characterized by means of XRD,SEM,TEM,FT-IR,and Raman spectroscopy,which confirmed that CoO@3D PG composites were successfully prepared through a simple carbonization process.The results show that CoO@3D PG has enhanced photocatalytic activity towards atenolol（ATE）and methylene blue（MB）compared with cobalt oxide or 3D PG alone.Three-dimensional porous graphene and ZIF-60 composites（PGZF）were successfully synthesized by a facile method.The formation of the target material was verified by characterization by scanning electron microscopy,transmission electron microscopy,FT-IR spectroscopy,and UV-vis spectroscopy.We used the synthesized PGZF samples for photodegradation and adsorption experiments of tetracycline,Congo red and methylene blue dyes,and studied their electromagnetic properties using an electrochemical workstation.The results show that the PGZF composite has excellent photocatalytic degradation and adsorption performance,and also exhibits good electrochemical performance...