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DC Field | Value | Language |
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dc.citation.endPage | 11938 | - |
dc.citation.number | 22 | - |
dc.citation.startPage | 11928 | - |
dc.citation.title | JOURNAL OF PHYSICAL CHEMISTRY C | - |
dc.citation.volume | 125 | - |
dc.contributor.author | Woo, Jinwoo | - |
dc.contributor.author | Choi, Hyunkyung | - |
dc.contributor.author | Sa, Young Jin | - |
dc.contributor.author | Kim, Ho Young | - |
dc.contributor.author | Lim, Taejung | - |
dc.contributor.author | Jang, Jue-Hyuk | - |
dc.contributor.author | Yoo, Sung Jong | - |
dc.contributor.author | Kim, Jin Young | - |
dc.contributor.author | Kim, Chul Sung | - |
dc.contributor.author | Joo, Sang Hoon | - |
dc.date.accessioned | 2023-12-21T15:42:28Z | - |
dc.date.available | 2023-12-21T15:42:28Z | - |
dc.date.created | 2021-07-14 | - |
dc.date.issued | 2021-06 | - |
dc.description.abstract | Iron and nitrogen codoped carbon (Fe-N/C) catalysts are considered the most promising nonprecious metal catalysts for the oxygen reduction reaction (ORR), with their activities approaching those of Pt-based catalysts. Recently, silica-based protective-layer or intermediate layer-assisted synthesis strategies have been developed to preferentially generate catalytically active Fe-N-x sites while suppressing inactive Fe clusters. However, the role of the silica layer in the formation of Fe-N-x sites remains elusive. In this study, we used X-ray absorption and Fe-57 Mossbauer spectroscopies to determine the evolution of the structure of Fe-based species during the silica-coating-mediated synthesis. Through X-ray absorption near-edge structure and Fe-57 Mossbauer spectroscopy analyses, the formation of iron silicide (Fe-Si) species after silica coating was identified. Peak parameter analyses of Fe-57 Mossbauer spectroscopy data suggested that the density of active Fe-N-x species with the Fe-N/C catalyst prepared with silica coating was twice as high as that of the Fe-N/C without silica coating. Consequently, the Fe-N/C catalyst with silica coating exhibited a kinetic current density for the ORR (0.9 V vs reversible hydrogen electrode, RHE) twice as high as that without silica coating. | - |
dc.identifier.bibliographicCitation | JOURNAL OF PHYSICAL CHEMISTRY C, v.125, no.22, pp.11928 - 11938 | - |
dc.identifier.doi | 10.1021/acs.jpcc.1c01333 | - |
dc.identifier.issn | 1932-7447 | - |
dc.identifier.scopusid | 2-s2.0-85108442955 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/53262 | - |
dc.identifier.url | https://pubs.acs.org/doi/10.1021/acs.jpcc.1c01333 | - |
dc.identifier.wosid | 000662197000012 | - |
dc.language | 영어 | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | Structural Evolution of Atomically Dispersed Fe Species in Fe-N/C Catalysts Probed by X-ray Absorption and Fe-57 Mossbauer Spectroscopies | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary | - |
dc.relation.journalResearchArea | Chemistry; Science & Technology - Other Topics; Materials Science | - |
dc.type.docType | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordPlus | OXYGEN-REDUCTION REACTION | - |
dc.subject.keywordPlus | FUNCTIONAL THEORY CALCULATIONS | - |
dc.subject.keywordPlus | NITROGEN-DOPED CARBON | - |
dc.subject.keywordPlus | ACTIVE-SITES | - |
dc.subject.keywordPlus | FE/N/C-CATALYSTS | - |
dc.subject.keywordPlus | ELECTROCATALYTIC ACTIVITY | - |
dc.subject.keywordPlus | ACTIVITY TRENDS | - |
dc.subject.keywordPlus | N-COORDINATION | - |
dc.subject.keywordPlus | FUEL-CELL | - |
dc.subject.keywordPlus | IRON | - |
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