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DC Field | Value | Language |
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dc.citation.endPage | 4377 | - |
dc.citation.number | 18 | - |
dc.citation.startPage | 4371 | - |
dc.citation.title | ELECTROCHIMICA ACTA | - |
dc.citation.volume | 54 | - |
dc.contributor.author | Kim, Chang H. | - |
dc.contributor.author | Jung, Yoon Seok | - |
dc.contributor.author | Lee, Kyu Tae | - |
dc.contributor.author | Ku, Jun H. | - |
dc.contributor.author | Oh, Seung M. | - |
dc.date.accessioned | 2023-12-22T07:44:12Z | - |
dc.date.available | 2023-12-22T07:44:12Z | - |
dc.date.created | 2014-09-29 | - |
dc.date.issued | 2009-07 | - |
dc.description.abstract | To improve the coulombic efficiency of GeO2 electrode, a Cu-containing ternary metal oxide (CuGeO3) was prepared and the electrochemical behavior of Cu component was studied. The GeO2 electrode shows a low coulombic efficiency in the first cycle (43%), which is mainly caused by a poor Ge oxidation kinetics (Ge + 2Li2O → GeO2 + 2Li+ + 2e-). The X-ray absorption spectroscopy (XAS) data illustrate that the Cu component in CuGeO3 is converted to nano-sized metallic Cu in the earlier stage of lithiation but idles thereafter. In contrast, the Ge component in CuGeO3 behaves like the GeO2 electrode. It is converted to nano-sized Ge by a conversion reaction and further lithiated by alloying reaction. The de-lithiation proceeds in the reverse order. The CuGeO3 electrode shows a much improved coulombic efficiency (74%) in the first cycle, which is indebted to a facilitated Ge oxidation with a much reduced electrode polarization. This feature has been explained by the favorable roles provided by the in situ generated nano-sized metallic Cu particles that make such an intimate contact with the nano-sized Ge and Li2O that they can catalyze Li2O decomposition and provide an electronic conductive network for Ge oxidation. A similar favorable effect was observed with the other ternary oxides (FeGeO3 and CoGeO3), wherein the formation of nano-sized metallic Fe and Co can be assumed. | - |
dc.identifier.bibliographicCitation | ELECTROCHIMICA ACTA, v.54, no.18, pp.4371 - 4377 | - |
dc.identifier.doi | 10.1016/j.electacta.2009.03.009 | - |
dc.identifier.issn | 0013-4686 | - |
dc.identifier.scopusid | 2-s2.0-65549103363 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/6715 | - |
dc.identifier.url | http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=65549103363 | - |
dc.identifier.wosid | 000266826200015 | - |
dc.language | 영어 | - |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | - |
dc.title | The role of in situ generated nano-sized metal particles on the coulombic efficiency of MGeO3 (M = Cu, Fe, and Co) electrodes | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | scopus | - |
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