Nickel–Cobalt Hydroxides with Tunable Thin-Layer Nanosheets for High-Performance Supercapacitor Electrode

Abstract Layered double hydroxides as typical supercapacitor electrode materials can exhibit superior energy storage performance if their structures are well regulated. In this work, a simple one-step hydrothermal method is used to prepare diverse nickel–cobalt layered (NiCo-LDHs), in which the different contents of urea regulate nanostructures NiCo-LDHs. The results show that decrease content effectively improve dispersibility, adjust thickness and optimize internal pore NiCo-LDHs, thereby enhancing capacitance performance. When reduced from 0.03 0.0075 g under fixed precursor mass ratio nickel (0.06 g) cobalt (0.02 3:1, prepared sample NiCo-LDH-1 exhibits 1.62 nm, clear thin-layer nanosheet large number surface pores formed, beneficial transmission ions into material. After being electrode, displays an ultra-high specific 3982.5 F −1 current density 1 A high retention above 93.6% after 1000 cycles charging discharging at 10 . excellent electrochemical proved by assembling two-electrode asymmetric with carbon spheres, displaying 95 78% over cycles. work offers facile way control nanostructure confirms important affection on capacitive for provides possibility development high-performance supercapacitors.