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Facile synthesis of Nb2O5@Carbon core-shell nanocrystals with controlled crystalline structure for high-power anodes in hybrid supercapacitors

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dc.contributor.authorLim, Eunho-
dc.contributor.authorJo, Changshin-
dc.contributor.authorKim, Haegyeom-
dc.contributor.authorKim, Mok-Hwa-
dc.contributor.authorMun, Yeongdong-
dc.contributor.authorChun, Jinyoung-
dc.contributor.authorYe, Youngjin-
dc.contributor.authorHwang, Jongkook-
dc.contributor.authorHa, Kyoung-Su-
dc.contributor.authorRoh, Kwang Chul-
dc.contributor.authorKang, Kisuk-
dc.contributor.authorYoon, Songhun-
dc.contributor.authorLee, Jinwoo-
dc.date.accessioned2020-04-25T08:01:07Z-
dc.date.available2020-04-25T08:01:07Z-
dc.date.issued2015-07-
dc.identifier.citationACS Nano, Vol.9 No.7, pp.7497-7505-
dc.identifier.issn1936-0851-
dc.identifier.other61759-
dc.identifier.urihttps://hdl.handle.net/10371/165059-
dc.description.abstractHybrid supercapacitors (battery-supercapacitor hybrid devices, HSCs) deliver high energy within seconds (excellent rate capability) with stable cyclability. One of the key limitations in developing high-performance HSCs is imbalance in power capability between the sluggish Faradaic lithium-intercalation anode and rapid non-Faradaic capacitive cathode. To solve this problem, we synthesize Nb2O5@carbon core-shell nanocyrstals (Nb2O5@C NCs) as high-power anode materials with controlled crystalline phases (orthorhombic (7) and pseudohexagonal (TT)) via a facile one-pot synthesis method based on a water-in-oil microemulsion system. The synthesis of ideal T-Nb2O5 for fast Li+ diffusion is simply achieved by controlling the microemulsion parameter (e.g., pH control). The T-Nb2O5@C NCs shows a reversible specific capacity of similar to 180 mA h g(-1) at 0.05 A g(-1) (1.1-3.0 V vs Li/Li+) with rapid rate capability compared to that of TT-Nb2O5@C and carbon shell-free Nb2O5 NCs, mainly due to synergistic effects of (i) the structural merit of T-Nb2O5 and (ii) the conductive carbon shell for high electron mobility. The highest energy (similar to 63 W h kg(-1)) and power (16 528 W kg(-1) achieved at similar to 5 W h kg(-1)) densities within the voltage range of 1.0-35 V of the HSC using T-Nb2O5@C anode and MSP-20 cathode are remarkable.-
dc.subjectorthorhombic Nb2O5 nanocrystals-
dc.subjectcontrolled crystal structures-
dc.subjectcore-shell nanostructures-
dc.subjecthigh-power anodes-
dc.subjecthybrid supercapacitors-
dc.titleFacile synthesis of Nb2O5@Carbon core-shell nanocrystals with controlled crystalline structure for high-power anodes in hybrid supercapacitors-
dc.typeArticle-
dc.contributor.AlternativeAuthor강기석-
dc.identifier.doi10.1021/acsnano.5b02601-
dc.citation.journaltitleACS Nano-
dc.identifier.scopusid2-s2.0-84938152116-
dc.citation.endpage7505-
dc.citation.number7-
dc.citation.startpage7497-
dc.citation.volume9-
dc.identifier.urlhttps://pubs.acs.org/doi/10.1021/acsnano.5b02601-
dc.identifier.rimsid61759-
dc.identifier.sci000358823200087-
dc.description.isOpenAccessN-
dc.contributor.affiliatedAuthorKang, Kisuk-
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Materials Science and Engineering (재료공학부)Journal Papers (저널논문_재료공학부)
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