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2 results on '"Youngkwang Yun"'

1. Simple Solid-Phase Synthesis of Hollow Graphitic Nanoparticles and Their Application to Direct Methanol Fuel Cell Electrodes

Author

Youngkwang Yun, Sangjin Han, Taeghwan Hyeon, Yung-Eun Sung, and Kyung-Won Park

Subjects
Direct methanol fuel cell, Materials science, Solid-phase synthesis, Chemical engineering, Mechanics of Materials, Chemistry, Simple (abstract algebra), Mechanical Engineering, Electrode, Nanoparticle, General Materials Science, Nanotechnology, General Medicine
Published
2004
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2. Origin of the enhanced catalytic activity of carbon nanocoil-supported PtRu alloy electrocatalysts

Author

Sang Jin Han, Youngkwang Yun, Kyung-Won Park, Taeghwan Hyeon, and Yung-Eun Sung

Subjects
Materials science, Alloy, chemistry.chemical_element, Nanotechnology, Carbon nanotube, engineering.material, Surfaces, Coatings and Films, Catalysis, law.invention, Crystallinity, Chemical engineering, chemistry, law, Materials Chemistry, medicine, engineering, Carbon nanotube supported catalyst, Physical and Theoretical Chemistry, Carbon, Activated carbon, medicine.drug, Alloy catalyst
Abstract

The origin of the excellent electrocatalytic performance of PtRu alloy catalysts supported on newly synthesized carbon nanocoil supports was investigated. Among three commercially available carbon materialsVulcan XC-72, multiwall carbon nanotube, and activated carbon, the Vulcan XC-72-supported catalyst exhibited the best catalytic performance. Carbon nanocoils with variable surface areas and crystallinity were employed as the supports for 60 wt % Pt/Ru (1:1) catalysts. The catalysts supported on all these three carbon nanocoils exhibited better electrocatalytic performance compared to the catalyst supported on Vulcan XC-72 carbon. In particular, the PtRu alloy catalyst supported on CNC-2, which has both good crystallinity and a large surface area, showed a superior electrocatalytic performance, compared to the catalysts supported on CNC-1 and CNC-3 carbons.

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