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dc.contributor.author이윤정-
dc.date.accessioned2019-12-06T06:48:10Z-
dc.date.available2019-12-06T06:48:10Z-
dc.date.issued2018-03-
dc.identifier.citationACS CATALYSIS, v. 8, no. 4, page. 2923-2934en_US
dc.identifier.issn2155-5435-
dc.identifier.urihttps://pubs.acs.org/doi/10.1021/acscatal.8b00248-
dc.identifier.urihttps://repository.hanyang.ac.kr/handle/20.500.11754/117943-
dc.description.abstractDespite their potential to provide high energy densities, lithium oxygen (Li-O-2) batteries are not yet widely used in ultrahigh energy density devices like electric vehicles, owing to various challenges, including poor cyclability, low efficiency, and poor rate capability, especially at high areal mass loading. Even the most promising Li-O-2 cells are unsuitable for practical applications, owing to a limited areal mass loading below 1 mg cm(-2), resulting in low areal capacity. Here, we demonstrate air cathodes of unprecedentedly high areal capacity at a high rate with sufficient cycle life for pragmatic operation of Li-O-2 batteries. A separator-carbon nanotube (CNT) monolith-type cathode of massive loading is prepared to achieve high areal capacity, but the cycle life and round-trip efficiency of CNT-only separator monolith cathodes are limited. The reversible and energy-efficient operation at high areal capacity and a high rate is enabled by adopting RuO2/MnO2 solid catalysts on the CNT (RMCNT). RMCNTs show a bifunctional catalytic effect in both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) and also completely decompose LiOH and Li2CO3 byproducts that may exist in discharged electrodes. This separator-RMCNT monolith offers beneficial features such as high mass loading, binder-free, intimate contact with the separator, and most importantly, catalysts for reversibility. Together, these features provide a remarkably long cycle life at unprecedentedly high capacity and high rate: 315, 45, and 40 cycles, with areal capacity limits of 1.5, 3.0, and 4.5 mAh cm(-2), respectively, at a rate of 1.5 mA cm(-2). Cycling is possible even at the curtailing capacity of 10 mAh cm(-2).en_US
dc.description.sponsorshipThis research was supported by the Basic Science Research Program and the Engineering Research Center of Excellence (ERC) Program of the National Research Foundation of Korea (NRF), Korean Ministry of Science, and ICT (grant no. NRF-2014R1A2A1A11049801 and NRF-2017R1A5A1014708).en_US
dc.language.isoen_USen_US
dc.publisherAMER CHEMICAL SOCen_US
dc.subjectlithium-oxygen batteriesen_US
dc.subjectRuO2/MnO2en_US
dc.subjectpractical applicationsen_US
dc.subjectmonolith cathodeen_US
dc.subjecthigh areal capacityen_US
dc.titleHigh-Rate and High-Areal-Capacity Air Cathodes with Enhanced Cycle Life Based on RuO2/MnO2 Bifunctional Electrocatalysts Supported on CNT for Pragmatic Li-O-2 Batteriesen_US
dc.typeArticleen_US
dc.relation.no4-
dc.relation.volume8-
dc.identifier.doi10.1021/acscatal.8b00248-
dc.relation.page2923-2934-
dc.relation.journalACS CATALYSIS-
dc.contributor.googleauthorLee, Young Joo-
dc.contributor.googleauthorPark, Se Hwan-
dc.contributor.googleauthorKim, Su Hyun-
dc.contributor.googleauthorKo, Youngmin-
dc.contributor.googleauthorKang, Kisuk-
dc.contributor.googleauthorLee, Yun Jung-
dc.relation.code2018004645-
dc.sector.campusS-
dc.sector.daehakCOLLEGE OF ENGINEERING[S]-
dc.sector.departmentDEPARTMENT OF ENERGY ENGINEERING-
dc.identifier.pidyjlee94-
dc.identifier.researcherIDM-1198-2017-
dc.identifier.orcidhttp://orcid.org/0000-0003-3091-1174-
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COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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