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Simultaneous Reduction of Co3+ and Mn4+ in P2-Na2/3Co2/3Mn1/3O2 As Evidenced by X‑ray Absorption Spectroscopy during Electrochemical Sodium Intercalation

hal.structure.identifierDepartment of Chemical Engineering
dc.contributor.authorCHENG, Ju-Hsiang
hal.structure.identifierDepartment of Chemical Engineering
dc.contributor.authorPAN, Chun-Jern
hal.structure.identifierDepartment of Chemical Engineering
dc.contributor.authorLEE, Jyh-Fu
hal.structure.identifierDepartment of Chemical Engineering
dc.contributor.authorCHEN, Jin-Ming
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGUIGNARD, Marie
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDELMAS, Claude
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCARLIER-LARREGARAY, Dany
hal.structure.identifierDepartment of Chemical Engineering
dc.contributor.authorHWANG, Bing-Joe
dc.date.issued2014
dc.identifier.issn0897-4756
dc.description.abstractEnSodium intercalation in P2-Na2/3Co2/3Mn1/3O2 (obtained by a coprecipitation method) was investigated by ex situ and in situ X-ray absorption spectroscopy. The electronic transitions at the O K-edge and the charge compensation mechanism, during the sodium intercalation process, were elucidated by combining Density Function Theory (DFT) calculations and X-ray absorption spectroscopy (XAS) data. The pre-edge of the oxygen K-edge moves to higher energy while the integrated intensity dramatically decreases, indicating that the population of holes in O 2p states is reduced with increasing numbers of sodium ions. From the K-edge and L-edge observations, the oxidation states of pristine Co and Mn were determined to be +III and +IV, respectively. The absorption energy shifts to lower positions during the discharging process for both the Co and the Mn edges, suggesting that the redox pairs, that is, Co3+/Co2+ and Mn4+/Mn3+, are both involved in the reaction.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.title.enSimultaneous Reduction of Co3+ and Mn4+ in P2-Na2/3Co2/3Mn1/3O2 As Evidenced by X‑ray Absorption Spectroscopy during Electrochemical Sodium Intercalation
dc.typeArticle de revue
dc.identifier.doi10.1021/cm403597h
dc.subject.halChimie/Matériaux
bordeaux.journalChemistry of Materials
bordeaux.page1219-1225
bordeaux.volume26
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-00958397
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00958397v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Chemistry%20of%20Materials&rft.date=2014&rft.volume=26&rft.issue=2&rft.spage=1219-1225&rft.epage=1219-1225&rft.eissn=0897-4756&rft.issn=0897-4756&rft.au=CHENG,%20Ju-Hsiang&PAN,%20Chun-Jern&LEE,%20Jyh-Fu&CHEN,%20Jin-Ming&GUIGNARD,%20Marie&rft.genre=article


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