A Facile Two-Step Hydrothermal Synthesis of Co(OH)@NiCoO Nanosheet Nanocomposites for Supercapacitor Electrodes.

The composites of NiCoO 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 NiCoO and subsequent preparation of Co(OH). The Co(OH)@NiCoO 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)@NiCoO nanosheet achieves higher specific capacitances of 1308 F·g at 0.5 A·g and notable long cycles with 92.83% capacity retention over 6000 cycles. The Co(OH)@NiCoO nanosheet electrode exhibits a long life span and high capacitances compared with the NiCoO and Co(OH) electrodes, respectively. These outstanding electrochemical properties are mainly because of their porous construction and the synergistic effects between NiCoO and Co(OH). Such unique Co(OH)@NiCoO nanosheets not only display promising applications in renewable storage but also reiterate to scientists of the unlimited potential of high-performance materials.