Key Words:Manganese oxide;Digital storage - Electric discharges - Electrochemical properties - Nanostructures - Potash - Supercapacitor
Abstract:In this paper, MnO<inf>2</inf> with four different structures (nanosandwiches, microsticks, nanowires and microflowers) are synthesized through varying reaction conditions, including the concentration of KMnO<inf>4</inf> solution and hydrothermal reaction temperature. Through comparing experimental data, it can be concluded that the microstructure of MnO<inf>2</inf> plays a vital role in electrochemical performance. Among the four structures, the microflower has the largest specific surface area for more electroactive sites, and thus demonstrates an excellent charge storage performance of 185 F/g at a current density of 0.5 A/g and cycling stability with a capacitance retention rate of 85% and a coulombic efficiency of nearly 100% after 10,000 charge-discharge cycles.<br/> © 2019 Elsevier B.V.
Volume:848
Issue:无
Translation or Not:no