Journal
IONICS
Volume 23, Issue 9, Pages 2241-2250Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-017-2079-9
Keywords
Mesoporous; Lithium-O-2 battery; Catalyst; La0.8Sr0.2MnO3 perovskite oxide; Nitrogen-doped graphene
Funding
- National Natural Science Foundation of China [21171060, 21671096, 21603094]
- Program for New Century Excellent Talents in University [NCET-12-0643]
- Shenzhen Peacock Plan [KQCX20140522150815065]
- Natural Science Foundation of Shenzhen [JCYJ20150331101823677, JCYJ20150630145302231]
- Science and Technology Innovation Foundation for the Undergraduates of SUSTC [2015x19, 2015x12]
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We have successfully devised a simple method to synthesize La0.8Sr0.2MnO3 with nitrogen-doped graphene composites (LSM/NrGO) and investigated their catalytic performance in the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Interestingly, the LSM/NrGO composites demonstrate outstanding catalytic performance in ORR, including high limiting current density and superior onset potential, compared to bare LSM nanocrystals or nitrogen-doped graphene, showing a performance close to that of commercial Pt/C. Moreover, Li-O-2 batteries assembled based on the LSM/NrGO catalysts exhibited brilliant performance, especially during long-term cycling, where the terminal discharge voltage still exceeded 2.31 V after 360 cycles. The excellent catalytic performance is mainly attributed to the large specific surface area (152.24 m(2) g(-1)) of the materials, which provides many catalytic active sites, and the mesoporous structure (2 to 50 nm), which can facilitate the penetration of oxygen molecules into the surface of the nanoparticles and mass transfer.
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