Design And Fabricate Electrode Materials Based On Prussian Blue Analogs And Applied In Energy Storage

Prussian blue and its analogs are a class of coordination complex.These complex have a wide range of applications in energy storage.In this project,precursors of Prussian blue were prepared by a simple co-precipitation synthesis.The composition of Prussian blue and two-dimensional MXene was used to explore its application flexible supercapacitor.The transition metal compound nanoparticles with special structure was prepared with the selecteable etchant of Prussian blue analogs.These nanoparticles were used to explore its application in sodium ion battery.The main experimental are shown as follows:（1）Flexible hybrid film electrode composed of Ti3C2TX layers and cubic Ni-Fe oxide derived from Prussian blue analog is fabricated by the solution processing.The cubic Ni-Fe oxide is wrapped by MXene layers and continuously stacked forming a macroscopic flexible film.The optimized composite film manifest remarkable areal capacitance of 1038.43 m F cm^-2 at 0.5 m A cm^-2.,An all solid-state flexible supercapacitor is fabricated based on the flexible hybrid film electrode,which displays highly stable cycling stability with capacitance retention of 90.9%during 10 000charging-discharging cycles and maintains stable energy storage performance during the mechanical bending after 50 cycles.（2）A simple cubic Prussian blue analog precursor is synthesized by co-precipitation method with Co source.After using three different molecular weight nitrogen compounds,tetramethylethylenediamine（TEMED）is selected.Suitable mass ratio of tetramethylethylenediamine:Prussian blue analog and etch timeare optimized.Meanwhile a flower-like product is selenized to obtain flower-like Co Se2,As anodes for SIBs,the flower-like Co Se2 electrode exhibits a high capacity of 501.2 m Ah g^-1 is obtained at a current density of 0.1 A g^-1and ultra-long cycle life and excellent rate performance,which can maintain high capacity retention rate of 95%even after 1500cycles at a current density of 1 A g^-1.（3）The Ni-Co Prussian blue analogue is synthesized by co-precipitation method,the precursor is etched with three concentrations of polyethyleneimine,which result that larger etchant can reduce the etch reaction time and no effect on the morphology of the etched products.Then,the suitable concentration of etchant is optimized,two novel morphologies prepared by the etching then successfully converted into oxide after annealing treatment.Then mixed oxide are used as anode materials for sodium ion batteries and test chemical properties.