Modified redox synthesis and electrochemical properties of potassium manganese oxide nanowires

Abstract

A convenient hydrothermal method has been developed for the controllable synthesis of various nanostructures of manganese oxides and their derivatives through modified redox reactions between Mn²⁺ and the combinative oxidizer of KBrO₃/KX (X = Cl, Br, I). The morphologies and oxidation states of the products could be modulated simply by changing the anions in KX to regulate the oxidizability of the combinative oxidizer. With KBrO₃/KBr as the oxidizer, potassium manganese oxide (KMO) nanowires are obtained owing to the appropriate oxidizability of the oxidizer as well as the assistance of ion-intercalated effect. The KMO nanowires exhibit the electrochemical capacitance of about 134.2 F g⁻¹ at the scan rate of 10 mV s⁻¹ and superior cycling stability as revealed by cyclic voltammetry and charge/discharge measurements, implying their potential application in supercapacitors for electrical storage.