Journal
CHEMSUSCHEM
Volume 9, Issue 16, Pages 2080-2088Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201600341
Keywords
graphenes; lithium-oxygen batteries; nanofibers; perovskites; ruthenium oxides
Funding
- Korea CCS R&D Center (KCRC) - Korea government (Ministry of Science, ICT & Future Planning) [NRF-2014M1A8A1049303]
- Global PH.D Fellowship Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2015H1A2A1033952]
- Hyundai Motor Company
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning [2014R1A2A2A01003542]
- National Research Foundation of Korea [2014R1A2A2A01003542, 2015H1A2A1033952, 2014M1A8A1049303] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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-O-2 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-O-2 cell employing the tailored catalysts delivers an excellent electrochemical performance, affording significantly reduced discharge/charge voltage gaps (1.0V at 400mAg(-1)), and superior cyclability for over 320cycles. 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.
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