A bi-functional metal-free catalyst composed of dual-doped graphene and mesoporous carbon for rechargeable lithium-oxygen batteries

Jae Hong Kim, Aravindaraj G. Kannan, Hyun Sik Woo, Dae Gun Jin, Wonkeun Kim, Kyounghan Ryu, Dong Won Kim

Research output: Contribution to journalArticle

42 Scopus citations

Abstract

Mesoporous carbon on nitrogen and sulfur co-doped graphene nanosheets (NSGC) was synthesized and its bi-functional catalytic activity toward oxygen reduction reaction and oxygen evolution reaction was investigated. The NSGC material showed high bi-functional catalytic activity due to the synergistic effect of co-doping of sulfur and nitrogen, as well as the presence of a hierarchical porous structure. The enhanced bi-functional catalytic activity of NSGC facilitated the efficient formation and decomposition of Li2O2 on the air cathode. The lithium-oxygen cell assembled with the NSGC-based air cathode delivered a high initial discharge capacity of 11 431 mA h g-1 and exhibited good cycling stability. The hybrid structure consisting of mesoporous carbon with co-doped graphene nanosheets can be an effective strategy to improve the round-trip efficiency and cycle life of lithium-oxygen batteries.

Original languageEnglish
Pages (from-to)18456-18465
Number of pages10
JournalJournal of Materials Chemistry A
Volume3
Issue number36
DOIs
StatePublished - 2015 Aug 4

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