A novel Co(phen)2/C catalyst for the oxygen electrode in rechargeable lithium air batteries
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A novel Co(phen)2/C catalyst was prepared by coating cobalt(II) phenanthroline (phen) chelate on BP2000 carbon black and then heat treating in an inert atmosphere. The obtained Co(phen)2/C product with 1.0 wt% cobalt loading exhibits similar morphology and porosity characteristics to those of the bare BP2000. X-ray diffraction measurements demonstrate a face-centered cubic (fcc) α-Co phase embedded in the carbon support after pyrolysis. Charge/discharge tests of the lithium-oxygen cells using the prepared Co(phen)2/C catalyst show high discharge capacities of 4870 mAh g−1 (0.05 mA cm−2), 3353 mAh g−1 (0.1 mA cm−2) and 3220 mAh g−1 (0.15 mA cm−2), respectively. The Co(phen)2/C cathode exhibits reasonable reversibility with capacity retention of 1401 mAh g−1 (0.1 mA cm−2) after 10 cycles. The superior electrochemical performance of the prepared Co(phen)2/C catalyst and low cost of the phenanthroline chelating agent indicate that Co(phen)2/C is a promising cheap catalyst for lithium-air batteries.
Keywordsrechargeable lithium-air batteries cobalt phenanthroline catalyst oxygen electrode
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