One-Dimensional RuO2/Mn2O3 Hollow Architectures as Efficient Bifunctional Catalysts for Lithium–Oxygen Batteries

详细信息    查看全文

• 作者：Ki Ro Yoon ; Gil Yong Lee ; Ji-Won Jung ; Nam-Hoon Kim ; Sang Ouk Kim ; Il-Doo Kim
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：March 9, 2016
• 年：2016
• 卷：16
• 期：3
• 页码：2076-2083
• 全文大小：743K
• ISSN：1530-6992

文摘

Rational design and massive production of bifunctional catalysts with fast oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) kinetics are critical to the realization of highly efficient lithium–oxygen (Li–O₂) batteries. Here, we first exploit two types of double-walled RuO₂ and Mn₂O₃ composite fibers, i.e., (i) phase separated RuO₂/Mn₂O₃ fiber-in-tube (RM-FIT) and (ii) multicomposite RuO₂/Mn₂O₃ tube-in-tube (RM-TIT), by controlling ramping rate during electrospinning process. Both RM-FIT and RM-TIT exhibited excellent bifunctional electrocatalytic activities in alkaline media. The air electrodes using RM-FIT and RM-TIT showed enhanced overpotential characteristics and stable cyclability over 100 cycles in the Li–O₂ cells, demonstrating high potential as efficient OER and ORR catalysts.