Reduced graphene oxide as a charge reservoir of manganese oxide: Interfacial interaction promotes charge storage property of MnOx-based micro-supercapacitors

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dc.contributor.authorByun, Segiko
dc.contributor.authorShim, Yoonsuko
dc.contributor.authorYuk, Jong Minko
dc.contributor.authorLee, Chan-Wooko
dc.contributor.authorYoo, Jungjoonko
dc.date.accessioned2022-05-06T07:00:09Z-
dc.date.available2022-05-06T07:00:09Z-
dc.date.created2022-05-06-
dc.date.created2022-05-06-
dc.date.created2022-05-06-
dc.date.issued2022-07-
dc.identifier.citationCHEMICAL ENGINEERING JOURNAL, v.439-
dc.identifier.issn1385-8947-
dc.identifier.urihttp://hdl.handle.net/10203/296381-
dc.description.abstractReduced graphene oxide (rGO)-based micro-supercapacitors (MSCs) have emerged as a new type of micro-energy storage device. However, the low volumetric energy density of rGO hampers the application of MSCs in mini-aturized energy storage devices. Hybridization of pseudocapacitive materials with rGO is a potential approach to increase the energy density of MSCs. Herein, a densely packed hybrid film of birnessite-type manganese oxide (K-MnOx) supported by rGO is developed, and hybrid-film-based MSCs are found to show a high volumetric capacitance (490 F/cm(3)) that is & nbsp;similar to 1.2 and 19 times greater than those of rGO and K-MnOx-based MSCs, respectively. A semi-permanent cycle life with capacitance retention of 97% after 10,000 cycles is observed. Moreover, a charge reservoir concept is introduced, which explains the origin of the high pseudocapacitance of the K-MnOx/rGO hybrid in a unique way. It is observed that synergistic interaction among the charge reservoir (rGO) and electron transfer channel (K-MnOx, which becomes conductive at the interface) facilitates the charging and discharging of K ions, with minimum deviation of the Mn oxidation states. This new charge reservoir concept would serve as a stepping stone toward designing novel hybrid devices with high energy storage capabilities.-
dc.languageEnglish-
dc.publisherELSEVIER SCIENCE SA-
dc.titleReduced graphene oxide as a charge reservoir of manganese oxide: Interfacial interaction promotes charge storage property of MnOx-based micro-supercapacitors-
dc.typeArticle-
dc.identifier.wosid000783190900002-
dc.identifier.scopusid2-s2.0-85126128489-
dc.type.rimsART-
dc.citation.volume439-
dc.citation.publicationnameCHEMICAL ENGINEERING JOURNAL-
dc.identifier.doi10.1016/j.cej.2022.135569-
dc.contributor.localauthorYuk, Jong Min-
dc.contributor.nonIdAuthorByun, Segi-
dc.contributor.nonIdAuthorLee, Chan-Woo-
dc.contributor.nonIdAuthorYoo, Jungjoon-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorReduced graphene oxide-
dc.subject.keywordAuthorBirnessite manganese oxide-
dc.subject.keywordAuthorHeterostructured film-
dc.subject.keywordAuthorDensity functional theory calculation-
dc.subject.keywordAuthorMicro-supercapacitor-
dc.subject.keywordPlusVOLUMETRIC CAPACITANCE-
dc.subject.keywordPlusGRAPHITE OXIDE-
dc.subject.keywordPlusANODE MATERIAL-
dc.subject.keywordPlusELECTRODE-
dc.subject.keywordPlusHYBRID-
dc.subject.keywordPlusPERFORMANCE-
dc.subject.keywordPlusMICROSUPERCAPACITORS-
dc.subject.keywordPlusNANOCOMPOSITE-
dc.subject.keywordPlusBEHAVIOR-
dc.subject.keywordPlusFILMS-
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