A porous hydrous ruthenium oxide for supercapacitors is fabricated by electro-deposition accompanied with hydrogen-evolution reaction. This high-surface-area electrode (207.5 m2 g-1) is developed by electrochemical de-alloying process of copper from as-deposited Ru-(Cu) foam (23.5 m2 g-1). The threedimensional structures with open pores and numerous dendritic morphologies produce good electrochemical performances by providing the pathway for facile penetration of electrolytes into active electrode surface. The three-dimensional porous hydrous ruthenium oxide exhibits good capacitance performance of 809 F g-1 at 1.5 A g-1, high energy density (112 Wh kg-1), and excellent stability retention (∼98%) even after 3000 cycles.
- Dendrite structure
- Electrochemical dealloying
- Hydrogen evolution reaction
- Porous hydrous ruthenium oxide