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Joo, Sang Hoon
Nanomaterials & Catalysis Lab
Research Interests
  • Catalyst, energy conversion, fuel cells, electrolyzer, ORR, HER, OER


Intrinsic Relation between Catalytic Activity of CO Oxidation on Ru Nanoparticles and Ru Oxides Uncovered with Ambient Pressure XPS

DC Field Value Language Qadir, Kamran ko Joo, Sang Hoon ko Mun, Bongjin S. ko Butcher, Derek R. ko Renzas, J. Russell ko Aksoy, Funda ko Liu, Zhi ko Somorjai, Gabor A. ko Park, Jeong Young ko 2014-04-10T01:52:54Z - 2013-06-20 ko 2012-11 ko
dc.identifier.citation NANO LETTERS, v.12, no.11, pp.5761 - 5768 ko
dc.identifier.issn 1530-6984 ko
dc.identifier.uri -
dc.description.abstract Recent progress in colloidal synthesis of nanoparticles with well-Controlled size, shape, and composition, together with development of in situ surface science characterization tool's, such as ambient pressure X-ray photoelectron spectroscopy (APXPS), has generated new opportunities to unravel the surface structure of working catalysts. We report an APXPS study of Ru nanoparticles to investigate catalytically active species on Ru nanoparticles under oxidizing, reducing, and CO oxidation reaction conditions. The 2.8 and 6 nm Ru nanoparticle Model catalysts were synthesized in the presence of poly(vinyl pyrrolidone) polymer capping agent and deposited onto a flat Si support as two-dimensional arrays using the Langmuir-Blodgett deposition technique. Mild oxidative and reductive characteristics, indicate the formation of surface oxide on the Ru nanoparticles, the thickness of Which is found to be dependent on nanoparticle size. The larger 6 nm Ru nanoparticles were oxidized to a smaller extent than the smaller Ru 2.8 nm nanoparticles within the temperature range of 50-200 degrees C under reaction conditions, which appears to he correlated with the higher catalytic, activity of the bigger nanoparticles. We found that the smaller. Ru nanoparticle form bulk RuO2 on their. surfaces, causing the lower catalytic activity As the size of the nanoparticle. increases, the core-shell type RuO2 becomes stable. Such in situ observations of Ru nanoparticles are useful in identifying the active state of the catalysts during use and hence, may allow for rational catalyst designs for practical applications. ko
dc.description.statementofresponsibility close -
dc.language 영어 ko
dc.publisher AMER CHEMICAL SOC ko
dc.title Intrinsic Relation between Catalytic Activity of CO Oxidation on Ru Nanoparticles and Ru Oxides Uncovered with Ambient Pressure XPS ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84869172019 ko
dc.identifier.wosid 000311244400054 ko
dc.type.rims ART ko
dc.description.scopustc 11 * 2014-07-12 *
dc.identifier.doi 10.1021/nl303072d ko
dc.identifier.url ko
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