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Electrochemically Generated KO2 as a Phase-Transfer Mediator for Na-O-2 Batteries
DC Field | Value | Language |
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dc.contributor.author | Jung, Min Soo | - |
dc.contributor.author | Ha, Seongmin | - |
dc.contributor.author | Koo, Dongho | - |
dc.contributor.author | Lee, Kyu Tae | - |
dc.date.accessioned | 2023-03-24T01:08:13Z | - |
dc.date.available | 2023-03-24T01:08:13Z | - |
dc.date.created | 2020-05-14 | - |
dc.date.created | 2020-05-14 | - |
dc.date.created | 2020-05-14 | - |
dc.date.issued | 2020-04 | - |
dc.identifier.citation | Journal of Physical Chemistry C, Vol.124 No.14, pp.7644-7651 | - |
dc.identifier.issn | 1932-7447 | - |
dc.identifier.uri | https://hdl.handle.net/10371/189747 | - |
dc.description.abstract | Superoxide-based Na-O-2 batteries have attracted much attention as promising alternatives to peroxide-based Li-O-2 batteries because of their small polarization for oxygen evolution reactions. However, the limited solubility of their discharge product, NaO2, leads to the surface-confined mechanism at high current densities, resulting in the poor energy density of Na-O-2 batteries. In this connection, a few protic phase-transfer catalysts, such as water and benzoic acid, have been examined to improve reversible capacity because they promote the solution-mediated mechanism. Herein, KO2, which is electrochemically generated from potassium trifluoromethanesulfonate dissolved in electrolytes during discharge, is introduced as a phase-transfer mediator for Na-O-2 batteries. The reaction mechanism of Na-O-2 batteries containing a KO2 mediator is clarified through ex situ XRD, cross-sectional SEM, and ICP analyses. KO2 plays the role of a phase-transfer mediator because the desolvation rate of KO2 is slower than that of NaO2. As a result, Na-O-2 batteries with KO2 show the solution-mediated mechanism rather than the surface-confined mechanism, thus delivering a high reversible capacity of approximately 6 mAh cm(-2). In addition, since KO2 is chemically and electrochemically more stable than previous protic phase-transfer mediators, Na-O-2 cells with KO2 show stable cycle performance, such as negligible capacity fading over 25 cycles. | - |
dc.language | 영어 | - |
dc.publisher | American Chemical Society | - |
dc.title | Electrochemically Generated KO2 as a Phase-Transfer Mediator for Na-O-2 Batteries | - |
dc.type | Article | - |
dc.identifier.doi | 10.1021/acs.jpcc.9b11631 | - |
dc.citation.journaltitle | Journal of Physical Chemistry C | - |
dc.identifier.wosid | 000526331500006 | - |
dc.identifier.scopusid | 2-s2.0-85084078832 | - |
dc.citation.endpage | 7651 | - |
dc.citation.number | 14 | - |
dc.citation.startpage | 7644 | - |
dc.citation.volume | 124 | - |
dc.description.isOpenAccess | N | - |
dc.contributor.affiliatedAuthor | Lee, Kyu Tae | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.subject.keywordPlus | NAO2 | - |
dc.subject.keywordPlus | MECHANISMS | - |
dc.subject.keywordPlus | OXIDATION | - |
dc.subject.keywordPlus | DISCHARGE | - |
dc.subject.keywordPlus | INSIGHTS | - |
dc.subject.keywordPlus | LI2O2 | - |
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