Mesoporous cobalt oxide (Co3O4) was studied for air electrode of Li-air rechargeable battery. In this study, mesoporous Co 3O4 with an average pore radius of 3.09 nm and BET surface area of 99m2/g was successfully prepared by using mesoporous SiO2 for template. Prepared mesoporous Co3O4 was applied for air electrode of Li-air battery after mixing with Pd and it was found that the cell showed a reasonably large discharge capacity of 481 mAh/g-cat. at 0.1 mA/cm2 at the initial cycle. Energy efficiency for charge and discharge was estimated to be ca. 75%. Raman spectroscopy suggests that the main product during discharge was Li 2O2 and formation of Li2CO3 was hardly observed.
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