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Kim, Kwang S.
Center for Superfunctional Materials (CSM)
Research Interests
  • Theoretical/experimental nanosciences, molecular electronics spectroscopy, energy materials

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Band Gap Narrowing of Zinc Orthogermanate by Dimensional and Defect Modification

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dc.contributor.author Kim, Dong Yeon ko
dc.contributor.author Yoon, Taeseung ko
dc.contributor.author Jang, Youn Jeong ko
dc.contributor.author Lee, Jin Ho ko
dc.contributor.author Na, Younghoon ko
dc.contributor.author Lee, Byeong Jun ko
dc.contributor.author Lee, Jae Sung ko
dc.contributor.author Kim, Kwang S. ko
dc.date.available 2019-07-22T00:35:29Z -
dc.date.created 2019-07-01 ko
dc.date.issued 2019-06 ko
dc.identifier.citation JOURNAL OF PHYSICAL CHEMISTRY C, v.123, no.23, pp.14573 - 14581 ko
dc.identifier.issn 1932-7447 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/27027 -
dc.description.abstract Dimensional reduction and defect control are powerful techniques for enhancing the physical and chemical properties of raw materials. Herein, we report the new type of sheetlike or two-dimensional-like zinc orthogermanate (Zn2GeO4, denoted as S-ZGO) with a one-step hydrothermal reaction and its application to photocatalytic water splitting. S-ZGO is directly grown along the surface of the Zn foil, since the growth rate of a crystal facet can be modified through the restricted reaction of dissolved precursor (GeO2) with a solid precursor (Zn foil) during the hydrothermal reaction. For further modification, the oxygen vacancies are introduced on the surface of S-ZGO using thermal hydrogen treatment and photodeposition-driven low amount of Pt/RuO2 co-catalysts loading. Notably, this reduced dimension decreases the band gap to 4.09 eV for S-ZGO (from 4.5 eV for the bulk), and the hydrogenation of S-ZGO further decreases the band gap to 3.88 eV. The origin of band gap narrowing is demonstrated with the density functional theory showing increased density of states at the edge of the conduction band (CB) and valence band (VB), and a new defect level between the CB minimum and VB maximum. As a possible application, we demonstrate that S-ZGO/H2 loaded with Pt/RuO2 exhibits the H2 rate of 167.0 μmol h-1 g-1 and the O2 rate of 83.0 μmol h-1 g-1, a8 times those of the rodlike ZGO photocatalysts. ko
dc.language 영어 ko
dc.publisher American Chemical Society ko
dc.title Band Gap Narrowing of Zinc Orthogermanate by Dimensional and Defect Modification ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85067046347 ko
dc.identifier.wosid 000471834000052 ko
dc.type.rims ART ko
dc.identifier.doi 10.1021/acs.jpcc.9b03728 ko
dc.identifier.url https://pubs.acs.org/doi/10.1021/acs.jpcc.9b03728 ko
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