Improving the specific capacity of nickel hydroxide nanocrystals via yttrium doping for application in hybrid supercapacitors

摘要

Herein, Y-doped Ni(OH)(2) composites were successfully fabricated via a simple hydrothermal process. The specific surface areas were significantly improved when Y3+ ions were incorporated into the Ni hydroxide lattice. The Y-doped Ni(OH)(2) electrode exhibited the remarkable specific capacity of 735.46 C g(-1) at 1.5 A g(-1) and ultrahigh rate performance with 71.36% capacity retention at 20 A g(-1). The optimum Y-doped Ni(OH)(2) electrodes were further evaluated for application in an asymmetric supercapacitor, demonstrating the maximum energy density of 55.49 W h kg(-1) at the power density of 843.31 W kg(-1) as well as satisfying cycling performance with 85.8% retention after 7000 cycles.