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dc.contributor.author이종목*
dc.contributor.author이영미*
dc.contributor.author김명화*
dc.contributor.author김수진*
dc.date.accessioned2019-06-04T16:30:07Z-
dc.date.available2019-06-04T16:30:07Z-
dc.date.issued2019*
dc.identifier.issn2168-0485*
dc.identifier.otherOAK-24841*
dc.identifier.urihttps://dspace.ewha.ac.kr/handle/2015.oak/249913-
dc.description.abstractHydrogen evolution reaction (HER) is of importance in energy conversion processes. This paper reports the facile synthesis of iridium/iridium oxide nanofibers (Ir/IrO(2)NFs) with diverse Ir and IrO2 relative composition ratios and their electrocatalytic HER activities. Highly porous Ir/IrO(2)NFs are simply synthesized via electrospinning and the following calcination at various temperatures (300-900 degrees C). Different calcination temperature alters the actual composition of Ir/IrO(2)NFs: The higher the temperature, the greater IrO2 content exists. The HER activity of Ir/IrO(2)NFs is examined in 1 M H2SO4. Ir/IrO2NF calcined at 300 degrees C exhibits the best HER activity in terms of the onset potential, overpotential generating 50 mA cm(-2), turnover frequency, Tafel slope along with the decent stability for 5 h; the HER performance of this material even exceeds that of platinum, a benchmark HER catalyst. As the IrO2 content in Ir/IrO(2)NFs increases with a higher calcination temperature, the HER activity decreases. Ir/IrO2NF calcined at 900 degrees C consists of only IrO2 and presents the worst activity. DFT calculations show that hydrogen atom adsorption on metallic Ir (not IrO2) resembles that on Pt: similar adsorption energy and adsorbate-substrate distance. Both the experimental and theoretical results clearly demonstrate that metallic Ir rather than IrO2 is a good HER catalytic platform.*
dc.languageEnglish*
dc.publisherAMER CHEMICAL SOC*
dc.subjectHydrogen evolution reaction*
dc.subjectNanofibers*
dc.subjectIridium metal*
dc.subjectIridium oxide*
dc.subjectElectrospinning*
dc.subjectDFT calculation*
dc.titleComparative Study on Hydrogen Evolution Reaction Activity of Electrospun Nanofibers with Diverse Metallic Ir and IrO2 Composition Ratios*
dc.typeArticle*
dc.relation.issue9*
dc.relation.volume7*
dc.relation.indexSCIE*
dc.relation.indexSCOPUS*
dc.relation.startpage8613*
dc.relation.lastpage8620*
dc.relation.journaltitleACS SUSTAINABLE CHEMISTRY & ENGINEERING*
dc.identifier.doi10.1021/acssuschemeng.9b00402*
dc.identifier.wosidWOS:000467351200064*
dc.identifier.scopusid2-s2.0-85065391765*
dc.author.googleKim, Su-jin*
dc.author.googleJung, Hyeseung*
dc.author.googleLee, Chongmok*
dc.author.googleKim, Myung Hwa*
dc.author.googleLee, Youngmi*
dc.contributor.scopusid이종목(55812178500)*
dc.contributor.scopusid이영미(35237907700)*
dc.contributor.scopusid김명화(57191596821)*
dc.contributor.scopusid김수진(55862532700;55461431200)*
dc.date.modifydate20240130103418*
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자연과학대학 > 화학·나노과학전공 > Journal papers
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