Tailored Combination of Low Dimensional Catalysts for Efficient Oxygen…
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논문명 | Tailored Combination of Low Dimensional Catalysts for Efficient Oxygen Reduction and Evolution in Li–O2 Batteries |
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저자 | Ki Ro Yoon, Dae Sik Kim, Won‐Hee Ryu, Sung Ho Song, Doo‐Young Youn, Ji‐Won Jung, Seokwoo Jeon, Yong Joon Park, Il‐Doo Kim |
저널명 | ChemSusChem |
게재년월 | 2016/8/23 |
Vol. pp | 9권 16호 페이지 2080-2088 |
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.