Hydrothermal preparation and the capacitance of hierarchical MnO2 nanoflower

Abstract. Hierarchical MnO2 nanoflower has been simply prepared via a hydrothermal treatment technology in a mixed solution of KMnO4 and cetyltrimethylammonium hydroxide at 90 ◦C for 12 h. The morphology and structure of the obtained material are examined by XRD, SEM, TEM, HRTEM, SAED, and N2 adsorption–desorption. The electrochemical properties are characterized by cyclic voltammetry, …