The Microwave Preparation And Electrochemical Properties Of Bi₂Se₃and Bi₃Se₄

Electrochemical capacitor is a new energy storage device with the advantages of highspecific capacitance, short charging time, long cycling life, wider work temperatures，energy conservation and green environmental protection. The performance of the electrodematerial is an important factor influencing the performances of electrochemical capacitor.According to the principle of the super capacitor into the electric double layer type supercapacitor and Pseudocapacitance type super capacitor. Pseudocapacitance, also known asfaraday pseudocapacitance not only on the electrode surface, and can be generated in theinternal electrode, and thus obtain a higher capacitance and the energy density than that ofthe electric double layer capacitance.In this paper，the nanosheet was prepared by microwave synthesis using the seleniumpowder(Se) and bismuth nitrate pentahydrate(Bi(NO3)3·5H2O) as a raw material. In thesynthesis process changing the proportion of raw materials and adding the right amount ofhydroxylamine synthesis nanoparticulate Bi3Se4. By X-ray diffraction(XRD), scanningelectron microscope(SEM) and transmission electron microscope(TEM) on the composi-tion and morphology of the samples were characterized.Apply two kinds of samples to super capacitor electrode materials, testing its cyclicvoltammograms, constant current charge-discharge and ac impedance by electrochemicalworkstation, analysis of test results and to study the electrochemical properties of thecapacitor. The two materials through the lithography and magnetron sputtering process onelectrochemical transparent flexible components and preparation into electrochemicalperformance test and the flexible study. Analysed the test results of the two materials.Results showed that in the three electrode system, when the scanning speed was1mv/s,Bi2Se3specific capacitance of the electrode was446.23F/g, Bi3Se4specific capacitance ofthe electrode of259.38F/g.In a transparent flexible device tests, when the scan rate was20mV/s, Bi2Se3electrode specific capacitance84.70F/cm3, cycle after1000times specific capacitance fellto95.48%; Bi3Se4electrode specific capacitance72.01F/cm3, cycle after1000timesspecific capacitance fell to90.26%. It can be seen as a supercapacitor electrode material Bi2Se3’s performance is much better than Bi3Se4. For Bi2Se3as the electrode material oftransparent flexible devices under the scan rate of1V/s flexible test, little change curveshowed that the device under the condition of crimp can be normal and efficient work. Inthe transparent flexible research greatly expanded the super capacitor application scopeand conditions of use.