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Stabilized Octahedral Frameworks in Layered Double Hydroxides by Solid-Solution Mixing of Transition Metals

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dc.contributor.authorLee, Ji Hoon-
dc.contributor.authorLee, Hyeon Jeong-
dc.contributor.authorLim, Soo Yeon-
dc.contributor.authorChae, Keun Hwa-
dc.contributor.authorPark, Sung Hyeon-
dc.contributor.authorChung, Kyung Yoon-
dc.contributor.authorDeniz, Erhan-
dc.contributor.authorChoi, Jang Wook-
dc.date.accessioned2020-03-16T11:10:51Z-
dc.date.available2020-03-16T11:10:51Z-
dc.date.issued2017-02-
dc.identifier.citationAdvanced Functional Materials, Vol.27 No.7, p. 1605225-
dc.identifier.issn1616-301X-
dc.identifier.other38406-
dc.identifier.urihttp://hdl.handle.net/10371/164703-
dc.description.abstractPseudocapacitors have received considerable attention, as they possess advantages of both rechargeable batteries and electric double layer capacitors. Among various active materials for pseudocapacitors, alpha-layered double hydroxides (alpha-TM(OH)(2), TM = transition metal) are promising due to their high specific capacities. Yet, irreversible alpha-to-beta phase transitions of alpha-TM(OH)(2) hinder their long-term cyclability, particularly when the TM is nickel. Here, it is reported that binary TM ion mixing can overcome the limited cycle lives of alpha-TM(OH)(2) by stabilizing the octahedral frameworks of alpha-TM(OH)(2). In particular, an alpha-TM(OH)(2) with equal amounts of nickel and cobalt exhibits long-term capacity retention (89.0% after 2000 cycles) and specific capacity (206 mA h g(-1)), which are better than those of individual TM counterparts. A series of analyses reveals that the improved performances originate from the synergistic effects between the TM ions; the preferred trivalent state of cobalt ions stabilizes the octahedral framework by accommodating the detrimental Jahn-Teller distortion of Ni3+. The stabilized framework also widens the redox swing range of the nickel up to 4+, thus, increasing the specific capacity of the corresponding alpha-TM(OH)(2). This study indicates that proper mixing of TMs is a prolific approach in enhancing the vital properties of alpha-TM(OH)(2), a promising family of pseudocapacitor materials.-
dc.subjectcrystal field theory-
dc.subjectJahn–Teller effects-
dc.subjectlayered double hydroxides-
dc.subjectoctahedral coordination-
dc.subjectsolid-solution mixing-
dc.titleStabilized Octahedral Frameworks in Layered Double Hydroxides by Solid-Solution Mixing of Transition Metals-
dc.typeArticle-
dc.contributor.AlternativeAuthor최장욱-
dc.identifier.doi10.1002/adfm.201605225-
dc.citation.journaltitleAdvanced Functional Materials-
dc.identifier.scopusid2-s2.0-85007481133-
dc.citation.number7-
dc.citation.startpage1605225-
dc.citation.volume27-
dc.identifier.rimsid38406-
dc.identifier.sci000394681900005-
dc.description.isOpenAccessN-
dc.contributor.affiliatedAuthorChoi, Jang Wook-
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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