Preparation and capacitance behavior of manganese oxide hollow structures with different morphologies via template-engaged redox etching

A variety of MnOx electrode materials with uniform nonspherical hollow interiors are successfully prepared via sacrificial template-engaged redox etching of the shape-controlled corresponding Cu2O nanocrystals in KMnO4 solution at room temperature. The as-prepared amorphous manganese oxide hollow star architecture shows not only a large area of 198 m2 g−1, but also an ideal capacitive behavior with a specific capacitance of 366 F g−1 in a neutral electrolyte system at a scan rate of 5 mV s−1.