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.