Influence of Li ions on the oxygen reduction reaction of platinum electrocatalyst

详细信息    查看全文

• 作者：Hao Liu^a ; Yangchuan Xing ; ^a ; ^{xingy@mst.edu"" rel=""nofollow}
• 关键词：Li-air battery ; Lithium cation ; Platinum electrocatalyst ; Oxygen reduction reaction
• 刊名：Electrochemistry Communications
• 出版年：2011
• 出版时间：June 2011
• 年：2011
• 卷：13
• 期：6
• 页码：646-649
• 全文大小：415 K

文摘

A Li-air battery can provide a much higher theoretical energy density than a Li-ion battery. The use of aqueous acidic electrolytes may prevent lithium oxide deposition from aprotic electrolytes and lithium carbonate precipitation from alkaline electrolytes. The present communication reports a study on the effect of Li ions on the oxygen reduction reaction (ORR) in sulfuric acid electrolytes. It was found that the Li ions have negligible interactions with the active surface of Pt catalysts. However, significantly lower ORR activities were found when Li ions are present in the sulfuric acid. The intrinsic kinetic activities were found to decrease with the increase of Li ion concentrations, but level off when the Li ion concentrations are larger than 1.0 M. The low activities of Pt catalysts in Li ion containing electrolytes were attributed to a constraining effect of Li ions on the diffusion of oxygen in the electrolyte solution.