Abstract: A Al-H2O2 semi-fuel cell using Ni foam supported NiCo2O4  nanowire arrays as cathode was reported.  Ni foam supported-NiCo2O4 nanowire arrays were prepared by a template-free growth method, and demonstrated that NiCo2O4 nanowires grow almost vertically from the surface of foamed Ni substrate by scanning electron microscopy(SEM). The effects of concentrations of H2O2, flow rate of electrolyte as well as operation temperature on the cell performance were investigated. The cell exhibited an open circuit voltage of about 1.40 V; peak power densities of 79 and 120 mW/cm2 at current densities of 98  and 172 mA/cm2 and a cell voltage of 0.80 V and 0.70 V operating at room temperature and 320 K, respectively, using aluminium sheet as anode fuel and 0.6 mol/L H2O2 as oxidant. The current density at 0.7 V and voltage 75 mA/cm2 remained nearly constant within a 5000 s  test period, the Ni foam supported NiCo2O4  nanowire arrays electrode exhibits superior activity, stability, and mass transport property for H2O2 electroreduction.

Key words: Ni foam supported NiCo2O4 nanowire array, Al-H2O2 semi-fuel cell, Cathode catalyst