Studies On The Controled Synthesis And Electrochemical Property Of Transition Metal(Hydro) Oxide Nanomaterials

Transition metal (hydrogen) oxide nano-materials have broadapplication prospects in the electrocatalysis, electroanalysis, andsupercapacitors owing to their rich morphology and structures. Thusdeveloping new synthetic route to obtain specific structure, size,dimensions of nanostructural system and researching the growth processhave important significance on in-depth study of the relationship betweenstructure and properties, and the directing synthesis of functional materials.This work does research on the synthesis and electrochemical properties of(hydrogen) oxide nano-materials of Mn, Ni, Zn. Exploring the formationprocess of materials and the relationship between electrochemicalproperties and structure.By using a liquid synthetic route, we prepared Mn3O4octahedronnanoparticles with high index planes and studied its electrocatalytic activityfor oxygen reduction and function in promoting direct electron transfer ofenzyme. Electrochemical results show that, relatively to the low-indexplanes of manganese oxide nanoparticles. Mn3O4octahedron showedhigher electrocatalytic activity for oxygen reduction. In addition, the prepared Mn3O4octahedron can promote fast direct electron transfer ofglucose oxidase (GOD) on electrode surface. Based on fast direct electrontransfer of glucose oxidase on the electrode surface, the prepared glucosebiosensor for glucose detection has high sensitivity, wide linear range, andanti-interference ability and so on.By using a simple drop-coating approach, we explore a novelmanganese dioxide nanosheets modified glassy carbon electrode(MNSs/GC) electrocatalyst, and study the electro-catalytic, electroanalyticproperty of MNSs/GC. Based on the unique structure and properties ofmanganese dioxide nanosheets and the high-performance, simple andpractical needs of electrocatalytic materials for chemically modifiedelectrode, we prepared MnO2nanosheets and dispensed the nanosheets onglassy carbon electrode surface to prepared MNSs/GC. Electrochemicalresults show that the prepared MNSs/GC showed good electrocatalyticactivity toward cysteine with lower potential compared with other MnO2nanomaterials, indicating that the manganese dioxide nanosheets may actas a potential nano-electrocatalytic materials. By using time-currenttechnology, MNSs/GC electrode shows a wide linear range, high sensitivityand good selectivity for the detection of cysteine.We prepared a manganese dioxide (MnO2) thin-film consisting ofMnO2nanosheets deposited on conductive Ni substrate via a facilesolution-based synthetic route and study the property of the thin-film as supercapacitor. The thin-film had an interconnected network structure,which was consisted of MnO2nanosheets perpendicularly standing on thesubstrate. Electrochemical results demonstrated that the nanosheet-basedMnO2thin-film electrode exhibited excellent capacitance performance withhigh rate property and good cycling stability. The capacitance retention isabout81.2%as the current density increased from0.5to5A·g1. Whencycled at a higher current density of1.25A·g1, the specific capacitancecould be retained at93%of its initial capacitance over5000cycles.By using a hydrothermal synthetic route, we perpared a Ni(OH)2thin-film on nickel plate with the nickel source from the nickel plate, andstudy the electro-catalytic and ultra-capacitor properties of as-preparedNi(OH)2thin-film. Structural tests show that the thin-films havecross-linking morphology. Electrochemical supercapacitor testing showsthat our prepared nickel hydroxide film electrode has a high rate-propertyand good cycling-stability. In addition, the prepared thin-film electrode alsoshowed good electrocatalytic oxygen reduction characteristics. Consideringthe good electrochemical performance and easy preparation process, thecurrent thin-film electrodes would have potential applications in thin-filmenergy devices.CoTsPc has been intercalated into ZnAl-LDH interlayer to preparedZnAl-CoTsPc-LDH inorganic-organic compound functional materials andthe electrocatalytic and electroanalytic property of ZnAl-CoTsPc-LDH has been studied. Structural tests show that the synthetic material has a typicallayered structure and CoTsPc being perpendicular to the ZnAl-LDH layers.Electrochemical results show that, relatively to pure CoTsPc and adsorbedCoTsPc on ZnAl-LDH (CoTsPc/ZnAl-LDH), the intercalated CoTsPcshowed higher electrocatalytic activity and stability. Based on its improvedelectrocatalytic activity and stability, ZnAl-CoTsPc-LDH modifiedelectrode showed excellent sensing performance for the detection ofglutathione.