Chemically grown 3D copper hydroxide electrodes with different morphologies for high-performance asymmetric supercapacitors

Abstract Present study investigated decoration of Cu(OH) 2 with different morphologies by copper precursors, on 3D nickel foam. The Cu(OH) 2 -A (nano flower)electrode showed an excellent capacitance of 1332 F g −1 at current density of 2 A g −1 compared to the Cu(OH) 2 -C (nano ribbon, 1100 F g −1 ) and Cu(OH) 2 -S (nano long leaf, 1013 F g −1 ) electrodes. Asymmetric supercapacitor (ASC) was fabricated, and showed maximum capacitance of 165 F g −1 at current density of 2 A g −1 with high energy density of 66.7 Wh kg −1 and power density of 5698 W kg −1 with excellent stability of 80% after 10,000 cycles.