Abstract
Due to high theoretical capacity and good electrochemical stability, nickel-cobalt hydroxide has attracted extensive attention in alkaline energy storage applications. In this work, we coated nickel cobalt hydroxide nitrate nanosheets arrays on CuO nanowires using a simple solvothermal reaction without any alkali sources and additional oxidants. The three-dimensional structure of core-shell nanowire arrays and the synergistic combination of Ni2+ and Co2+/Co3+ resulted in a large specific capacity of 3.76 mAh cm−2 (43.2 F cm−2) under 11.6 mg cm−2. At the power density of 0.754 kW kg−1, the energy density of as-fabricated nickel-zinc battery can reach 530.1 Wh kg−1, indicating excellent alkaline energy storage performance.
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