Schist‐like Nanostructured Manganese Oxides and Their Electrochemical Capacitance Properties

With an aim to develop environment friendly and inexpensive materials for electrochemical capacitor electrodes, nanocrystalline γ‐MnO₂ with layered architecture of schist‐like structure was successfully synthesized by reducing mixed MnSO₄×H₂O and CTAMnO₄ precursors in stoichiometric amounts through a hydrothermal process. The as‐prepared MnO₂ was characterized by field emission scanning electron microscopy, X‐ray diffraction, and thermal gravimetric analysis. Also, cyclic voltammetry was employed to investigate the electrochemical properties of the products in neutral KCl aqueous solution, showing a higher enhanced capacitive performance than that of the sample without a coating of schist‐like γ‐MnO₂, indicating that our MnO₂‐based electrode provides a promising opportunity for high‐performance energy storage devices.