Ordered Self-supporting NiV LDHs@P-Nickel foam Nano-array as High-Performance supercapacitor electrode

Transition metal layered double hydroxides (LDHs) with amazing theoretical capacitance have caused remarkable interest as a potential supercapacitor electrode materials. However, the exerted low performance limits their further application. Nano-engineering technology was considered to be an effective strategy to further expose the pseudocapacitive properties of materials. Here, an ordered NiV LDHs@P-NF nanoarray was successfully constructed via phosphorized pretreatment and hydrothermal growth method. The as prepared NiV LDHs@P-NF electrode delivers an areal capacitance of 2.85 F cm^-2 at the current density of 20 mA cm^-2 and rarely decrease capacitance after over 5000 cycles at 50 mA cm^-2. Furthermore, the asymmetric supercapacitor assembled with prepared NiV LDHs@P-NF as the positive electrode and activated carbon as the negative electrode was found to show a maximum energy density of 0.202 mWh cm^-2 under a power density of 7.022 mW cm^-2. This work suggests that the NiV LDHs@P-NF nano-arrays electrode can be regard as the remarkable candidate to improve the performance of the asymmetric supercapacitor.