Catalytic properties of Co(3)O(4 )nanoparticles for rechargeable Li/air batteries

Three types of Co(3)O(4 )nanoparticles are synthesized and characterized as a catalyst for the air electrode of a Li/air battery. The shape and size of the nanoparticles are observed using scanning electron microscopy and transmission electron microscopy analyses. The formation of the Co(3)O(4 )phase is confirmed by X-ray diffraction. The electrochemical property of the air electrodes containing Co(3)O(4 )nanoparticles is significantly associated with the shape and size of the nanoparticles. It appears that the capacity of electrodes containing villiform-type Co(3)O(4 )nanoparticles is superior to that of electrodes containing cube- and flower-type Co(3)O(4 )nanoparticles. This is probably due to the sufficient pore spaces of the villiform-type Co(3)O(4 )nanoparticles.