2.2. Synthesis of porous Co3O4@Co core/shell nanowire arrays
The self-supported Co3O4 nanowire arrays were used as the
backbone for the growth Co shell by a simple electro-deposition
method. The electro-deposition was performed in a two-electrode
glass cell at 25 C in the electrolyte consisting of 0.05 mol L1 cobalt
sulfate + 0.1 mol L1 ammonium chloride, the above Co3O4 nanowire
arrays as the working electrode, and a Pt foil as the counter
electrode. The electro-deposition was carried out at 2.5 mA cm2
for 10 min to form Co3O4@Co core/shell nanowire arrays. The load
weight of Co3O4 and Co is about 2.2 and 0.25 mg cm2, respectively