Instability of a noncrystalline NaO2 film in Na-O2 batteries: The controversial effect of the RuO2 catalyst

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dc.citation.epage19686en_US
dc.citation.issueNumber34en_US
dc.citation.spage19678en_US
dc.citation.volumeNumber122en_US
dc.contributor.authorTovini, M. F.en_US
dc.contributor.authorHong, M.en_US
dc.contributor.authorPark, J.en_US
dc.contributor.authorDemirtaş, M.en_US
dc.contributor.authorToffoli, D.en_US
dc.contributor.authorUstunel, H.en_US
dc.contributor.authorByon, H. R.en_US
dc.contributor.authorYılmaz, E.en_US
dc.date.accessioned2019-02-21T16:02:16Zen_US
dc.date.available2019-02-21T16:02:16Zen_US
dc.date.issued2018en_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractThe unique electrochemical and chemical features of sodium-oxygen (Na-O2) batteries distinguish them from the lithium-oxygen (Li-O2) batteries. NaO2 as the main discharge product is unstable in the cell environment and chemically degrades, which triggers side products' formation and charging potential increment. In this study, RuO2 nanoparticles dispersed on carbon nanotubes (CNTs) are used as the catalyst for Na-O2 batteries to elucidate the effect of the catalyst on these complex electrochemical systems. The RuO2/CNT contributes to the formation of a poorly crystalline and coating-like NaO2 structure during oxygen reduction reaction, which is drastically different from the conventional micron-sized cubic NaO2 crystals deposited on the CNT. Our findings demonstrate a competition between NaO2 and side products' decompositions for RuO2/CNT during oxygen evolution reaction (OER). We believe that this is due to the lower stability of a coating-like NaO2 because of its noncrystalline nature and high electrode/electrolyte contact area. Although RuO2/CNT catalyzes the decomposition of side products at a lower potential (3.66 V) compared to CNT (4.03 V), it cannot actively contribute to the main electrochemical reaction of the cell during OER (NaO2 → Na+ + O2 + e-) because of the fast chemical degradation of the film NaO2 to the side products. Therefore, tuning the morphology and crystallinity of NaO2 by a catalyst is detrimental for the Na-O2 cell performance and it should be taken into account for the future applications.en_US
dc.description.provenanceMade available in DSpace on 2019-02-21T16:02:16Z (GMT). No. of bitstreams: 1 Bilkent-research-paper.pdf: 222869 bytes, checksum: 842af2b9bd649e7f548593affdbafbb3 (MD5) Previous issue date: 2018en_US
dc.description.sponsorshipThis study is financially supported by The Scientific and Technological Research Council of Turkey (TUBITAK) with the project number 115M375 and the National Research Foundation (NRF) of Korea (grant NRF-2016R1C1B2008690).en_US
dc.identifier.doi10.1021/acs.jpcc.8b06024en_US
dc.identifier.eissn1932-7455en_US
dc.identifier.issn1932-7447en_US
dc.identifier.urihttp://hdl.handle.net/11693/49986en_US
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttps://doi.org/10.1021/acs.jpcc.8b06024en_US
dc.relation.projectNational Research Foundation of Korea, NRF: NRF-2016R1C1B2008690 - 115M375 - Council for Scientific and Industrial Research, CSIRen_US
dc.source.titleJournal of Physical Chemistry Cen_US
dc.titleInstability of a noncrystalline NaO2 film in Na-O2 batteries: The controversial effect of the RuO2 catalysten_US
dc.typeArticleen_US

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