Tailored Combination of Low Dimensional Catalysts for Efficient Oxygen Reduction and Evolution in Li-O2 Batteries

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• 作者：Ki Ro Yoon ; Dae Sik Kim ; Prof. Won-Hee Ryu ; Prof. Sung Ho Song ; Doo-Young Youn ; Ji-Won Jung ; Prof. Seokwoo Jeon ; Prof. Yong Joon Park and Prof. Il-Doo Kim
• 刊名：ChemSusChem
• 出版年：2016
• 出版时间：August 23, 2016
• 年：2016
• 卷：9
• 期：16
• 页码：2080-2088
• 全文大小：2703K
• ISSN：1864-564X

文摘

The development of efficient bifunctional catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is a key issue pertaining high performance Li–O₂ batteries. Here, we propose a heterogeneous electrocatalyst consisting of LaMnO₃ nanofibers (NFs) functionalized with RuO₂ nanoparticles (NPs) and non-oxidized graphene nanoflakes (GNFs). The Li–O₂ cell employing the tailored catalysts delivers an excellent electrochemical performance, affording significantly reduced discharge/charge voltage gaps (1.0 V at 400 mA g⁻¹), and superior cyclability for over 320 cycles. The outstanding performance arises from (1) the networked LaMnO₃ NFs providing ORR/OER sites without severe aggregation, (2) the synergistic coupling of RuO₂ NPs for further improving the OER activity and the electrical conductivity on the surface of the LaMnO₃ NFs, and (3) the use of GNFs providing a fast electronic pathway as well as improved ORR kinetics.