Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 6, Pages 2234-2241Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b00488
Keywords
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Funding
- RIKEN [IBS-R014-G2]
- National Research Foundation (NRF) of Korea [2010-00285]
- Japan-Korea Basic Scientific Cooperation Program from Japan Society for the Promotion of Science (JSPS)
- SR Center at Ritsumeikan University (Japan) [R1341]
- Ministry of Science, ICT & Future Planning, Republic of Korea [IBS-R014-D1-2015-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2013K1A3A1A32035430, 2010-00285] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We report a novel catalytic reaction to promote oxidation of carbonate and carboxylate species using nanoporous nickel oxide (NiO) in the lithium-oxygen (Li-O-2) battery. These nanoporous NiO catalysts in the shape of two-dimensional (2-D) hexagonal plates are incorporated on the carbon nanotube (CNT) electrode, which remarkably enhances oxidation efficiency of carbonate and carboxylate species as representative side products in Li-O-2 electrochemistry and greatly improves the cycleability to more than 70 cycles. The oxidation reaction predominantly occurs at the nanoporous NiO, toward which the carbonate and carboxylate species may migrate for the complete decomposition. This result is notably distinguished from a NiO-free CNT electrode, where such a passivation layer becomes thicker and precludes electron transfer, thus inducing poor cyclability.
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