Full metadata record
DC Field | Value | Language |
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dc.contributor.author | 최진호 | - |
dc.contributor.author | 황성주 | - |
dc.date.accessioned | 2016-08-28T12:08:24Z | - |
dc.date.available | 2016-08-28T12:08:24Z | - |
dc.date.issued | 2011 | - |
dc.identifier.issn | 0959-9428 | - |
dc.identifier.other | OAK-7411 | - |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/221482 | - |
dc.description.abstract | New phases of Zn-Co-layered double hydroxides (Zn-Co-LDHs) were synthesized for the first time via a co-precipitation reaction using hydrogen peroxide as an oxidant. According to powder X-ray diffraction and field emission-scanning electron microscopy, both nitrate- and sulfate-forms of the Zn-Co-LDHs crystallized with the brucite-type layer structure having interlayer nitrate and sulfate anions, respectively, and commonly showed plate-like morphology with a crystal size of several hundred nanometers. dc magnetic susceptibility measurements revealed that the Zn-Co-LDHs displayed ferromagnetic/ antiferromagnetic transitions below 15 K and the magnetic moment calculated from the paramagnetic region (30-300 K) indicated the co-existence of weak field Co 2+ and strong field Co 3+ ions. The mixed oxidation state of Co 2+/Co 3+ was confirmed by the results of iodometry and X-ray absorption near-edge structure spectroscopy. The heat-treatment for the Zn-Co-LDHs at elevated temperatures produced mixed metal oxide nanocomposites composed of spinel ZnCo 2O 4 and wurzite ZnO phases. The colloidal suspension of exfoliated Zn-Co-LDH nanosheets could be synthesized by dispersion of the pristine LDH materials in formamide, which was confirmed by the Tyndall phenomenon, high resolution-transmission electron microscopy/selected area electron diffraction, and UV-vis spectroscopy. The Zn-Co-LDH film fabricated with the restacked nanosheets exhibited pseudocapacitive behavior with a large specific capacitance and a good capacitance retention. The present findings underscore that the newly synthesized mixed valence Zn-Co-LDH phases showed promising functionality as a supercapacitor electrode material and also showed interesting magnetic coupling behavior. © 2011 The Royal Society of Chemistry. | - |
dc.language | English | - |
dc.title | Mixed valence Zn-Co-layered double hydroxides and their exfoliated nanosheets with electrode functionality | - |
dc.type | Article | - |
dc.relation.issue | 12 | - |
dc.relation.volume | 21 | - |
dc.relation.index | SCOPUS | - |
dc.relation.startpage | 4286 | - |
dc.relation.lastpage | 4292 | - |
dc.relation.journaltitle | Journal of Materials Chemistry | - |
dc.identifier.doi | 10.1039/c0jm03430d | - |
dc.identifier.wosid | WOS:000288220600042 | - |
dc.identifier.scopusid | 2-s2.0-79952593035 | - |
dc.author.google | Woo M.A. | - |
dc.author.google | Song M.-S. | - |
dc.author.google | Kim T.W. | - |
dc.author.google | Kim I.Y. | - |
dc.author.google | Ju J.-Y. | - |
dc.author.google | Lee Y.S. | - |
dc.author.google | Kim S.J. | - |
dc.author.google | Choy J.-H. | - |
dc.author.google | Hwang S.-J. | - |
dc.contributor.scopusid | 최진호(8044393000) | - |
dc.contributor.scopusid | 황성주(7404626171) | - |
dc.date.modifydate | 20190901081003 | - |