Figure 4From: Catalytic properties of Co3O4 nanoparticles for rechargeable Li/air batteriesSEM images of the air electrodes. Air electrodes composed of Co3O4 nanoparticles, carbon (Ketjen black), and binder before the test and after discharge at 2.3 V. (a) Cube type, (b) villiform type, and (c) flower type.Back to article page