A Facile Two-Step Hydrothermal Synthesis of Co(OH)(2)@NiCo(2)O(4) Nanosheet Nanocomposites for Supercapacitor Electrodes

The composites of NiCo(2)O(4) with unique structures were substantially investigated as promising electrodes. In this study, the unique structured nanosheets anchored on nickel foam (Ni foam) were prepared under the hydrothermal technique of NiCo(2)O(4) and subsequent preparation of Co(OH)(2). The Co(OH)(2)@NiCo(2)O(4) nanosheet composite has demonstrated higher specific capacitances owing to its excellent specific surface region, enhanced rate properties, and outstanding electrical conductivities. Moreover, the electrochemical properties were analyzed in a three-electrode configuration to study the sample material. The as-designed Co(OH)(2)@NiCo(2)O(4) nanosheet achieves higher specific capacitances of 1308 F·g(−1) at 0.5 A·g(−1) and notable long cycles with 92.83% capacity retention over 6000 cycles. The Co(OH)(2)@NiCo(2)O(4) nanosheet electrode exhibits a long life span and high capacitances compared with the NiCo(2)O(4) and Co(OH)(2) electrodes, respectively. These outstanding electrochemical properties are mainly because of their porous construction and the synergistic effects between NiCo(2)O(4) and Co(OH)(2). Such unique Co(OH)(2)@NiCo(2)O(4) nanosheets not only display promising applications in renewable storage but also reiterate to scientists of the unlimited potential of high-performance materials.