▎ 摘　　要

This work presents the effect of different contents of graphene foam (GF) on the electrochemical capacitance of nickel phosphate Ni-3(PO4)(2) nano-rods as an electrode material for hybrid electrochemical energy storage device applications. Pristine Ni-3(PO4)(2) nano-rods and Ni-3(PO4)(2)/GF composites with different GF mass loadings of 30, 60, 90 and 120 mg were synthesised via a hydrothermal method. The electrochemical behavior of pristine Ni-3(PO4)(2) and Ni-3(PO4)(2)/GF composites were analysed in a three-electrode cell configuration using 6 M KOH electrolyte. The Ni-3(PO4)(2)/90 mg GF composite sample exhibited the highest specific capacity of 48 mA h g(-1) at a current density of 0.5 A g(-1). The electrochemical behavior of the Ni-3(PO4)(2)/90 mg GF composite was further analysed in a two-electrode hybrid asymmetric device. A hybrid asymmetric device was fabricated with Ni-3(PO4)(2)/90 mg GF as the cathode and carbonized iron cations (Fe3+) adsorbed onto polyaniline (PANI) (C-FP) as the anode material (Ni-3(PO4)(2)/90 mg GF//C-FP) and tested in a wide potential window range of 0.0-1.6 V using 6 M KOH. This hybrid device achieved maximum energy and power densities of 49 W h kg(-1) and 499 W kg(-1), respectively, at 0.5 A g(-1) and had long-term cycling stability.