Design of Hollow Porous P-NiCo(2)O(4)@Co(3)O(4) Nanoarray and Its Alkaline Aqueous Zinc-Ion Battery Performance

Alkaline aqueous zinc-ion batteries possess a wider potential window than those in mildly acidic systems; they can achieve high energy density and are expected to become the next generation of energy storage devices. In this paper, a hollow porous P-NiCo(2)O(4)@Co(3)O(4) nanoarray is obtained by ion etching and the calcination and phosphating of ZiF-67, which is directly grown on foam nickel substrate, as a precursor. It exhibits excellent performance as a cathode material for alkaline aqueous zinc-ion batteries. A high discharge specific capacity of 225.3 mAh g(−1) is obtained at 1 A g(−1) current density, and it remains 81.9% when the current density is increased to 10 A g(−1). After one thousand cycles of charging and discharging at 3 A g(−1) current density, the capacity retention rate is 88.8%. Even at an excellent power density of 25.5 kW kg(−1), it maintains a high energy density of 304.5 Wh kg(−1). It is a vital, promising high-power energy storage device for large-scale applications.