In this work, bundlelike CuCo 2 O 4 microstructures (CuCo 2 O 4 BMs) assembled with ultrathin nanosheets were fabricated through employing an easy and scalable hydrothermal method along with an extra thermal treatment in air. These CuCo 2 O 4 BMs possessed a specific surface area as large as 114.36 m 2 g −1 and a mean pore size of 10.99 nm with pore size distribution at 1.88 nm. The electrochemical behavior was evaluated in 2 M KOH solution. It demonstrated that the CuCo 2 O 4 BMs exhibited the typical features of battery-type electrode material with a specific capacity up to 303.22 C g −1 at 1 A g −1 , a rate capability of 69.77% at 10 A g −1 , and 71.8% capacity retention after 5000 cycles at 5 A g −1 . A hybrid supercapacitor (HSC) was assembled with CuCo 2 O 4 BMs as the cathode and activated carbon as the anode, respectively. The HSC exhibited a specific capacity of 152.25 C g −1 at 1 A g −1 with 111.75% retention over 5000 cycles and delivered a remarkable energy density of 39.95 W h kg −1 at 944.63 W kg −1 and still maintained 27.06 W h kg −1 even at 8.06 kW kg −1 . By virtue of these impressive electrochemical performances, the CuCo 2 O 4 BMs can serve as a promising battery-type electrode material toward high-performance hybrid supercapacitors and other energy-storage systems.

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