Figure 4.

SEM 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.

Kim and Park Nanoscale Research Letters 2012 7:47   doi:10.1186/1556-276X-7-47
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