Abstract
Monodisperse Mn3O4 nanoparticles were prepared solvothermally starting from manganese acetate by using polyether amide block copolymers (Pebax2533) as a template in isopropanol. The diameter of the nanoparticles in the range of 8.7 nm∼31.5 nm was decreased with increase of Pebax2533 concentration. The electrochemical properties and application in supercapacitor of Mn3O4 nanoparticles were further studied. The results showed that smaller nanoparticles had a larger capacitance. The higher capacitance of 217.5 F/g at a current density of 0.5 A/g was obtained on 8.7 nm Mn3O4 nanoparticles. The specific capacitance retention of 82% was maintained after 500 times of continuous charge-discharge cycles.
Highlights
Supercapacitor, known as electrochemical capacitor, is an electrochemical energy storage element which stores electrical energy based on electrode/electrolyte interface with almost no energy loss in the process
It is found that the capacity retained after 500 cycles is about 82% of the initial specific capacitance. These results demonstrated that the Mn3O4 nanoparticles synthesized were very stable in the repeated charge-discharge cycles as supercapacitor electrode material
Monodisperse Mn3O4 nanoparticles have been synthesized by solvothermal method through self-assembly using polyether amide block copolymers (Pebax2533) as the template and manganese acetate as the raw material
Summary
Supercapacitor, known as electrochemical capacitor, is an electrochemical energy storage element which stores electrical energy based on electrode/electrolyte interface with almost no energy loss in the process. We prepared Mn3O4 nanoparticles with different diameters by using solvothermal method with Pebax2533 block copolymer as a template. C (wt.%) Fig. 2 The relationship between the concentration of Pebax2533 in the isopropanol and average particle diameter of Mn3O4 nanoparticles.
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