The Oxidation of Cobalt Nanoparticles into Kirkendall-Hollowed CoO and Co3O4: The Diffusion Mechanisms and Atomic Structural Transformations
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ha, Don-Hyung | - |
dc.contributor.author | Moreau, Liane M. | - |
dc.contributor.author | Honrao, Shreyas | - |
dc.contributor.author | Hennig, Richard G. | - |
dc.contributor.author | Robinson, Richard D. | - |
dc.date.accessioned | 2022-01-24T02:49:42Z | - |
dc.date.available | 2022-01-24T02:49:42Z | - |
dc.date.issued | 2013-07 | - |
dc.identifier.issn | 1932-7447 | - |
dc.identifier.issn | 1932-7455 | - |
dc.identifier.uri | https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/54143 | - |
dc.description.abstract | We report on the atomic structural changes and diffusion processes during the chemical transformation of epsilon-Co nanoparticles (NPs) through oxidation in air into hollow CoO NPs and then Co3O4 NPs. Through XAS, XRD, TEM, and DFT calculations, the mechanisms of the transformation from epsilon-Co to CoO to Co3O4 are investigated. Our DFT calculations and experimental results suggest that a two-step diffusion process is responsible for the Kirkendall hollowing of epsilon-Co into CoO NPs. This first step is O in-diffusion by an indirect exchange mechanism through interstitial O and vacancies of type I Co sites of the epsilon-Co phase. This indirect exchange mechanism of O has a lower energy barrier than a vacancy-mediated diffusion of O through type I sites. When to CoO phase is established, the Co then diffuses outward faster than the O diffuses inward, resulting in a hollow NP. The lattice orientations during the transformation show preferential orderings after the single-crystalline. epsilon-Co NPs are transformed to polycrystalline CoO and Co3O4 NPs. Our Co3O4 NPs possess a high ratio of {110} surface planes, which are known to have favorable catalytic activity. The Co3O4 NPs can be redispersed in an organic solvent by adding surfactants, thus rendering a method to create solution-processable colloidal, monodisperse Co3O4 NPs. | - |
dc.format.extent | 10 | - |
dc.language | 영어 | - |
dc.language.iso | ENG | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | The Oxidation of Cobalt Nanoparticles into Kirkendall-Hollowed CoO and Co3O4: The Diffusion Mechanisms and Atomic Structural Transformations | - |
dc.type | Article | - |
dc.identifier.doi | 10.1021/jp402939e | - |
dc.identifier.bibliographicCitation | JOURNAL OF PHYSICAL CHEMISTRY C, v.117, no.27, pp 14303 - 14312 | - |
dc.description.isOpenAccess | N | - |
dc.identifier.wosid | 000321883600064 | - |
dc.citation.endPage | 14312 | - |
dc.citation.number | 27 | - |
dc.citation.startPage | 14303 | - |
dc.citation.title | JOURNAL OF PHYSICAL CHEMISTRY C | - |
dc.citation.volume | 117 | - |
dc.type.docType | Article | - |
dc.publisher.location | 미국 | - |
dc.subject.keywordPlus | INITIO MOLECULAR-DYNAMICS | - |
dc.subject.keywordPlus | LOW-TEMPERATURE OXIDATION | - |
dc.subject.keywordPlus | TOTAL-ENERGY CALCULATIONS | - |
dc.subject.keywordPlus | COMBINED X-RAY | - |
dc.subject.keywordPlus | ROOM-TEMPERATURE | - |
dc.subject.keywordPlus | CATION-EXCHANGE | - |
dc.subject.keywordPlus | IN-SITU | - |
dc.subject.keywordPlus | SURFACE-STRUCTURE | - |
dc.subject.keywordPlus | REDUCTION | - |
dc.subject.keywordPlus | NANOCRYSTALS | - |
dc.relation.journalResearchArea | Chemistry | - |
dc.relation.journalResearchArea | Science & Technology - Other Topics | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical | - |
dc.relation.journalWebOfScienceCategory | Nanoscience & Nanotechnology | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.description.journalRegisteredClass | sci | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.
84, Heukseok-ro, Dongjak-gu, Seoul, Republic of Korea (06974)02-820-6194
COPYRIGHT 2019 Chung-Ang University All Rights Reserved.
Certain data included herein are derived from the © Web of Science of Clarivate Analytics. All rights reserved.
You may not copy or re-distribute this material in whole or in part without the prior written consent of Clarivate Analytics.