PPy coated nanoflower like CuCoObased ongrowth of nanoporous copper for high-performance supercapacitor electrodes.

General CuCoOelectrodes suffer a very low reversible capacity and poor cycling stability because of easily fading phenomena and volume change during cycling. To optimize the electrode, a facile method is conducted to fabricate a novel electrode of Cu@CuCoO@polypyrrole nanoflowers. Due to larger specific surface area and more electrochemical reactive areas of CuCoO@polypyrrole nanoflowers, the pseudocapacitance of thegrown CuCoO@polypyrrole (912 F gat 2 A g) is much higher than the pristine CuCoO(618 F gat 2 A g). Remarkably, the CuCoO@polypyrrole (cathode) and active carbon (anode) are used to assemble an asymmetric supercapacitor, which exhibits a relatively high energy density of 90 Wh kgat a power density of 2519 W kgand 35 Wh kgat a high-power density of 9109 W kg, and excellent cycling stability (about 90.4% capacitance retention over 10 000 cycles). The prominent performance of CuCoO@polypyrrole makes it as a potential electrode for supercapacitor.