CuCo2O4 flowers/Ni foam architecture as a battery type positive electrode for high performance hybrid supercapacitor applications
Abstract The battery type CuCo 2 O 4 electrode was evaluated as a positive electrode material for its hybrid supercapacitor applications. CuCo 2 O 4 flowers were prepared on Ni foam through a simple hydrothermal process and post calcination treatment. The structure and morphology of the CuCo 2 O 4 flowers/Ni foam was characterized by X ray diffraction (XRD) field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy. FESEM clearly revealed the flower like morphology, which was composed of large number of petals. The length and width of the petals ranged from approximately 5 8 mm and approximately 50 150 nm, respectively. The CuCo 2 O 4 flowers/Ni foam electrode was employed for electrochemical characterization for hybrid supercapacitor applications. The specific capacity of the CuCo 2 O 4 flower like electrode was 692.4C g 1 (192.3 mA h g 1 at a scan rate of 5 mV s 1 The flower like CuCo 2 O 4 electrode exhibited a maximum specific capacity of 645.1C g 1 (179.2 mA h g 1 at a specific current of 1 A g 1 and good long term cyclic stability. The high specific capacity, good cyclic stability, and low internal and charge transfer resistance of the CuCo 2 O 4 flowers/Ni foam electrode confirmed the suitability of the prepared material as a positive electrode for hybrid supercapacitor applications.