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A facile and mild approach was used for the controlled synthesis of 3D porous gear-like CuO on a Cu substrate (PGC) based on annealing gear-like Cu(OH) 2 (GC) at 200 uC in air. There are 3-10 edges that build up a gear-like structure and a huge number of holes formed on each edge. As an integrated nanostructure, the binder-free PGC can be used as a supercapacitors electrode (SC) directly. Due to its 3D porous structure and the highly conductive Cu substrate as a current collector, the integrated electrode exhibited excellent electrochemical properties. These were demonstrated by excellent specific capacitance as high as 348 F g 21 at a discharge current density of 1 A g 21 , which corresponds to the energy density of 43.5 Wh kg 21 . The electrochemical tests also showed that the as-synthesized PGC exhibited excellent cycling stability.

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