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dc.contributor.author이종목-
dc.contributor.author이영미-
dc.contributor.author김명화-
dc.date.accessioned2020-03-23T16:30:16Z-
dc.date.available2020-03-23T16:30:16Z-
dc.date.issued2020-
dc.identifier.issn0925-4005-
dc.identifier.otherOAK-26590-
dc.identifier.urihttps://dspace.ewha.ac.kr/handle/2015.oak/253612-
dc.description.abstractThis paper reports the facile formation of the alloy nanofibers of highly immiscible Au and Ir with diverse composition ratios (denoted as TH2_AuxIr1-x, x= 0.05, 0.10 or 0.33, relative molar content of Au precursor) and the application for direct glucose oxidation. First, the composite nanofibers consisting of Ir/IrO2 fibrous main frames decorated with Au nanoparticles (denoted as Pre_AuxIr1-xOy ) were synthesized via electrospinning and calcination. Then, these composites were annealed under H-2 gas flowing and successfully transformed to AuIr alloy nanofibers along with IrO2 reduction to Ir metal in the Ir/IrO2 fibrous frames. Thermal H-2-treatments with varying temperatures and duration times confirmed that Au-Ir alloy production required an unusually low temperature >= 90 degrees C at which Au and Ir were completely alloyed within 1 min. This study suggests that the Au-Ir alloying and IrO2 reduction occur simultaneously and promote each other. TH2_Au0.33Ir0.67, with similar to 50.4 % Au atomic %, was found to still have segregated Au phase, indicating the limited solubility (molar ratio of Au/Ir < 1). Alloyed TH2_Au0.10Ir0.90 exhibited high electroactivity for glucose oxidation: a surprisingly low onset potential ( < < - 0.4 V vs SCE) and greatly enhanced oxidation current levels compared with Pre_Au0.10Ir0.90Oy and pure Au nanoparticles. The high activity of TH2_Au0.10Ir0.90 go was attributed to the higher surface area of Au and more favorable formation of catalytically active OHads in the Au-Ir alloy. Current study presents that Au-Ir alloys can be formed under moderate condition via thermal H-2-treatment and possess a feasibility for nonenzymatic glucose oxidation.-
dc.languageEnglish-
dc.publisherELSEVIER SCIENCE SA-
dc.subjectIridium-
dc.subjectGold-
dc.subjectNanofibrous alloy-
dc.subjectElectrospinning-
dc.subjectGlucose oxidation-
dc.subjectElectrocatalysis-
dc.titleAu-Ir alloy nanofibers synthesized from Au-Ir/IrO2 composites via thermal hydrogen treatment: Application for glucose oxidation-
dc.typeArticle-
dc.relation.volume310-
dc.relation.indexSCIE-
dc.relation.indexSCOPUS-
dc.relation.journaltitleSENSORS AND ACTUATORS B-CHEMICAL-
dc.identifier.doi10.1016/j.snb.2020.127822-
dc.identifier.wosidWOS:000519306300012-
dc.identifier.scopusid2-s2.0-85079172333-
dc.author.googleYu, Areum-
dc.author.googleMoon, Sinyoung-
dc.author.googleKwon, Taehui-
dc.author.googleCho, Yun-Bin-
dc.author.googleKim, Myung Hwa-
dc.author.googleLee, Chongmok-
dc.author.googleLee, Youngmi-
dc.contributor.scopusid이종목(55812178500)-
dc.contributor.scopusid이영미(35237907700)-
dc.contributor.scopusid김명화(14025589300)-
dc.date.modifydate20210423081001-
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자연과학대학 > 화학·나노과학전공 > Journal papers
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