Preparation And Application Of Selenide Derived From Metal Organic Frameworks

The nanomaterials can shorten the transmission distance of lithium ion diffusion and reduce the internal resistance of the battery system;hollow structure design can provide greater specific surface area and more active sites;and porous structure can provide a reserved space that can better adapt to the volume changes in the charging and discharging process of lithium ion batteries,and effectively avoiding pulverization phenomenon.There is great potential in the study of lithium ion battery electrode materials.The rapid development of nanomaterials has made their application in the field of biomedicine more and more popular by researchers,while hollow structure nanomaterials have large specific surface area and more active sites,and gradually become the drug carrier.Zeolitic Imidazolate Frameworks?ZIFs?are coordinated with imidazole organic ligands with divalent zinc,cobalt,and other transition metals,which is a type of crystal material formed by self-assembly with a zeolite topology.ZIFs with stable structure are often used as a template to prepare morphologically controlled derivative materials.The materials derived from ZIF-67,such as hollow carbon,metal oxides,and metal sulphides,have shown excellent performance in the study of lithium ion batteries,but less research on metal selenides involved in this aspect.Therefore,it is imperative to study its application in lithium-ion batteries.In addition,the selenide derived from ZIF-67 has the advantages of hollow,porous,multi-site,etc.,which shows the great potential in drug loading and cancer treatment.Based on this,this article will focus on the preparation of metal-organic framework material derivatives.The specific work is as follows:?1?Preparation of NiCoSe₂ and NiCoSe₂@NC composites.The nickel and cobalt bimetallic hydrotalc analogue with a hollow structure?NiCo layed double hydroxide,NiCo-LDH?was prepared with ZIF-67 as a template.Then NiCo-LDH@PDA?Polydopamine,PDA?was prepared with the characteristics of dopamine adhesion growth.Hollow,porous NiCoSe₂ and NiCoSe₂@NC?Nitrogen-doped Carbon,NC?nanomaterials was obtained followed by selenization.?2?Electrochemical properties of NiCoSe₂ and NiCoSe₂@NC composites.Using NiCoSe₂and NiCoSe₂@NC as cathode materials for lithium-ion batteries,NiCoSe₂ showed a high specific capacity,demonstrating the great potential of NiCoSe₂ as a cathode material.NiCoSe₂@NC due to carbon-layer was more stable in structure,when NiCoSe₂@NC was used as a negative electrode material for lithium ion batteries,NiCoSe₂@NC nanocomposites exhibited excellent multiplier properties.When the current density was 0.5,1,2,5,10 A g^-1,the capacity was 772,728,669,534 and 397 mAh g^-1,their performance was significantly better than commercial graphite materials.?3?Biological properties of NiCoSe₂ and NiCoSe₂@NC composites.Cytological experiments showed that the two materials exhibit good biocompatibility when the concerntration is less than 80?g/mL.Under the same concentration,NiCoSe₂@NC shows less cytotoxicity and NiCoSe₂ has a better inhibitory effect on iver cancer cell SMMC-7721.The inhibition showed a good anti-cancer potential.