Methods for synthesizing nanometer-sized manganese dioxides having ramsdellite-type crystal structures as well as methods for producing hydroxide ion-derived proton, electron and oxygen using manganese dioxides

摘要

By means of a series of wet multistage oxidation process comprising: Step 1 for adding an alkaline reagent to an aqueous solution of a manganese compound containing a divalent manganese thereby precipitating a manganese hydroxide; Step 2 for adding an aqueous hydrogen peroxide while keeping the temperature of the water of the aqueous solution comprising the manganese hydroxide at room temperature thereby converting into a manganese oxide; and also Step 3 for adding a dilute acid to the manganese oxide in a state where the water is coexisting, a nanometer-sized manganese dioxide having a ramsdellite-type crystal structure is obtained.

主权项

1. A method for synthesizing a manganese dioxide comprising a series of wet multistage oxidation process comprising: Step 1 for adding an alkaline reagent to an aqueous solution of a manganese compound containing a divalent manganese thereby precipitating a manganese hydroxide; Step 2 for adding an aqueous hydrogen peroxide while keeping the temperature of the water of said aqueous solution at room temperature thereby converting said manganese hydroxide into a manganese oxide; and Step 3 for adding a dilute acid to said manganese oxide in a state where the water is coexisting thereby obtaining a nanometer-sized manganese dioxide having a ramsdellite-type crystal structure.