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.identifier | Department of Chemical Engineering | |
dc.contributor.author | CHENG, Ju-Hsiang | |
hal.structure.identifier | Department of Chemical Engineering | |
dc.contributor.author | PAN, Chun-Jern | |
hal.structure.identifier | Department of Chemical Engineering | |
dc.contributor.author | LEE, Jyh-Fu | |
hal.structure.identifier | Department of Chemical Engineering | |
dc.contributor.author | CHEN, Jin-Ming | |
hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
dc.contributor.author | GUIGNARD, Marie | |
hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
dc.contributor.author | DELMAS, Claude | |
hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
dc.contributor.author | CARLIER-LARREGARAY, Dany | |
hal.structure.identifier | Department of Chemical Engineering | |
dc.contributor.author | HWANG, Bing-Joe | |
dc.date.issued | 2014 | |
dc.identifier.issn | 0897-4756 | |
dc.description.abstractEn | Sodium 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.iso | en | |
dc.publisher | American Chemical Society | |
dc.title.en | Simultaneous Reduction of Co3+ and Mn4+ in P2-Na2/3Co2/3Mn1/3O2 As Evidenced by X‑ray Absorption Spectroscopy during Electrochemical Sodium Intercalation | |
dc.type | Article de revue | |
dc.identifier.doi | 10.1021/cm403597h | |
dc.subject.hal | Chimie/Matériaux | |
bordeaux.journal | Chemistry of Materials | |
bordeaux.page | 1219-1225 | |
bordeaux.volume | 26 | |
bordeaux.issue | 2 | |
bordeaux.peerReviewed | oui | |
hal.identifier | hal-00958397 | |
hal.version | 1 | |
hal.popular | non | |
hal.audience | Internationale | |
hal.origin.link | https://hal.archives-ouvertes.fr//hal-00958397v1 | |
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