A novel Co(phen)_2/C catalyst for the oxygen electrode in rechargeable lithium air batteries

• 来源期刊: 科学通报(英文版)
• 学科: 工学
• 年，卷（期）: 2012,（16）
• 页码范围: 1959-1963
• 页数: 5页
• 分类号: TM911.41
• 语种: 中文

摘要

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.