Electrochemical energy storage devices having high power density and energy density with robust cycle life are necessary to addressing ever-growing global energy demand.In order to realize a high-performance electrode,we designed and fabricated metal oxides-based supercapacitor electrode materials with hierarchical nanostructure.Strategies for hierarchical nanostructures are conducted to meet- Electrochemical energy storage devices having high power density and energy density with robust cycle life are necessary to address ever-growing global energy demand. In order to realize a high-performance electrode, we designed and fabricated metal oxides-based supercapacitor electrode materials with hierarchical nanostructure .Strategies for hierarchical nanostructures are conducted to meet-