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dc.contributor.author유원철-
dc.date.accessioned2019-04-17T02:05:12Z-
dc.date.available2019-04-17T02:05:12Z-
dc.date.issued2016-03-
dc.identifier.citationCHEMISTRY OF MATERIALS, v. 28, No. 5, Page. 1526-1536en_US
dc.identifier.issn0897-4756-
dc.identifier.issn1520-5002-
dc.identifier.urihttps://pubs.acs.org/doi/abs/10.1021/acs.chemmater.5b05037-
dc.identifier.urihttps://repository.hanyang.ac.kr/handle/20.500.11754/102197-
dc.description.abstractMagnesiothermic reduction of various types of silica/carbon (SiO2/C) composites has been frequently used to synthesize silicon/carbon (Si/C) composites and silicon carbide (SiC) materials, which are of great interest in the research areas of lithium-ion batteries (LIBs) and nonmetal oxide ceramics, respectively. Up to now, however, it has not been comprehensively understood how totally different crystal phases of Si or SiC can result from the compositionally identical parent materials (SiO2/C) via magnesiothermic reduction. In this article, we propose a formation mechanism of Si and SiC by magnesiothermic reduction of SiO2/C; SiC is formed at the interface between SiO2 and carbon when silicon intermediates, mainly in situ-formed Mg2Si, encounter carbon through diffusion. Otherwise, Si is formed, which is supported by an ex situ reaction between Mg2Si and carbon nanosphere that results in SiC. In addition, the resultant crystalline phase ratio between Si and SiC can be controlled by manipulating the synthesis parameters such as the contact areas between silica and carbon of parent materials, reaction temperatures, heating rates, and amount of the reactant mixtures used. The reasons for the dependence on these synthesis parameters could be attributed to the modulated chance of an encounter between silicon intermediates and carbon, which determines the destination of silicon intermediates, namely, either thermodynamically preferred SiC or kinetic product of Si as a final product. Such a finding was applied to design and synthesize the hollow mesoporous shell (ca. 3-4 nm pore) SiC, which is particularly of interest as a catalyst support under harsh environments.en_US
dc.description.sponsorshipThis work was supported by the Basic Science Research Program through the National Research Foundation of Korea (2014R1A1A2057204).en_US
dc.language.isoen_USen_US
dc.publisherAMER CHEMICAL SOCen_US
dc.subjectLITHIUM-ION BATTERIESen_US
dc.subjectMESOPOROUS SILICONen_US
dc.subjectORDERED MESOPOROSITYen_US
dc.subjectREVERSIBLE STORAGEen_US
dc.subjectANODE MATERIALSen_US
dc.subjectENERGY-STORAGEen_US
dc.subjectSURFACE-AREASen_US
dc.subjectCARBONen_US
dc.subjectPERFORMANCEen_US
dc.subjectPOWDERen_US
dc.titleVariation in Crystalline Phases: Controlling the Selectivity between Silicon and Silicon Carbide via Magnesiothermic Reduction using Silica/Carbon Compositesen_US
dc.typeArticleen_US
dc.relation.no5-
dc.relation.volume28-
dc.identifier.doi10.1021/acs.chemmater.5b05037-
dc.relation.page1526-1536-
dc.relation.journalCHEMISTRY OF MATERIALS-
dc.contributor.googleauthorAhn, Jihoon-
dc.contributor.googleauthorKim, Hee Soo-
dc.contributor.googleauthorPyo, Jung-
dc.contributor.googleauthorLee, Jin-Kyu-
dc.contributor.googleauthorYoo, Won Cheol-
dc.relation.code2016002061-
dc.sector.campusE-
dc.sector.daehakCOLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E]-
dc.sector.departmentDEPARTMENT OF CHEMICAL AND MOLECULAR ENGINEERING-
dc.identifier.pidwcyoo-


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