title: Tailored Combination of Low Dimensional Catalysts for Efficient Oxygen Reduction and Evolution in Li-O2 Batteries.
abstract: 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.
authors.affiliation: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
authors.forename: Ki Ro
authors.initials: KR
authors.lastname: Yoon
authors.affiliation: Department of Advanced Materials Engineering, Kyonggi University, Iui-dong, Yeongtong-gu, Suwon, Gyeonggi-do, 16227, Republic of Korea.
authors.forename: Dae Sik
authors.initials: DS
authors.lastname: Kim
authors.affiliation: Department of Chemical and Biological Engineering, Sookmyung Women's University, 100 Chengpa-ro 47 gil, Yongsan-gu, Seoul, 04310, Republic of Korea.
authors.forename: Won-Hee
authors.initials: WH
authors.lastname: Ryu
authors.affiliation: Division of Advanced Materials Engineering, Kongju National University, Chungnam, 330-717, Republic of Korea.
authors.forename: Sung Ho
authors.initials: SH
authors.lastname: Song
authors.affiliation: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
authors.forename: Doo-Young
authors.initials: DY
authors.lastname: Youn
authors.affiliation: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
authors.forename: Ji-Won
authors.initials: JW
authors.lastname: Jung
authors.affiliation: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
authors.forename: Seokwoo
authors.initials: S
authors.lastname: Jeon
authors.affiliation: Department of Advanced Materials Engineering, Kyonggi University, Iui-dong, Yeongtong-gu, Suwon, Gyeonggi-do, 16227, Republic of Korea. yjpark2006@kyonggi.ac.kr.
authors.forename: Yong Joon
authors.initials: YJ
authors.lastname: Park
authors.affiliation: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea. idkim@kaist.ac.kr.
authors.forename: Il-Doo
authors.initials: ID
authors.lastname: Kim
mesh_terms: D002384:Catalysis; D011211:Electric Power Supplies; D004563:Electrochemistry; D008094:Lithium / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D008094:Lithium; D010100:Oxygen
keywords: graphenes; lithium-oxygen batteries; nanofibers; perovskites; ruthenium oxides