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9 results on '"Jeong Kuk Shon"'

1. Discovery of abnormal lithium-storage sites in molybdenum dioxide electrodes

Author

Jeong Kuk Shon, Hyo Sug Lee, Gwi Ok Park, Jeongbae Yoon, Eunjun Park, Gyeong Su Park, Soo Sung Kong, Mingshi Jin, Jae-Man Choi, Hyuk Chang, Seokgwang Doo, Ji Man Kim, Won-Sub Yoon, Chanho Pak, Hansu Kim, and Galen D. Stucky

Subjects
Science
Abstract

Electrode materials with high energy density are important for the development of Li-ion batteries. Here, the authors report a molybdenum dioxide anode with abnormal lithium storage sites, exhibiting a discharge capacity twice its theoretical value by utilizing two different storage mechanisms.

Published
2016
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2. Discovery of abnormal lithium-storage sites in molybdenum dioxideelectrodes

Author

Gwi Ok Park, Soo Sung Kong, Galen D. Stucky, Mingshi Jin, Eunjun Park, Hyo Sug Lee, Jae-Man Choi, Gyeong Su Park, Hansu Kim, Jeong Kuk Shon, Chanho Pak, Ji Man Kim, Jeongbae Yoon, Won-Sub Yoon, Seok-Gwang Doo, and Hyuk Chang

Subjects
Battery (electricity), Materials science, Science, Oxide, General Physics and Astronomy, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Article, General Biochemistry, Genetics and Molecular Biology, chemistry.chemical_compound, Scanning transmission electron microscopy, Multidisciplinary, Electron energy loss spectroscopy, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, Chemical engineering, Electrode, Lithium, 0210 nano-technology, Mesoporous material, Molybdenum dioxide
Abstract

Developing electrode materials with high-energy densities is important for the development of lithium-ion batteries. Here, we demonstrate a mesoporous molybdenum dioxide material with abnormal lithium-storage sites, which exhibits a discharge capacity of 1,814 mAh g−1 for the first cycle, more than twice its theoretical value, and maintains its initial capacity after 50 cycles. Contrary to previous reports, we find that a mechanism for the high and reversible lithium-storage capacity of the mesoporous molybdenum dioxide electrode is not based on a conversion reaction. Insight into the electrochemical results, obtained by in situ X-ray absorption, scanning transmission electron microscopy analysis combined with electron energy loss spectroscopy and computational modelling indicates that the nanoscale pore engineering of this transition metal oxide enables an unexpected electrochemical mass storage reaction mechanism, and may provide a strategy for the design of cation storage materials for battery systems., Electrode materials with high energy density are important for the development of Li-ion batteries. Here, the authors report a molybdenum dioxide anode with abnormal lithium storage sites, exhibiting a discharge capacity twice its theoretical value by utilizing two different storage mechanisms.

Published
2016
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3. Highly stable mesoporous metal oxides using nano-propping hybrid Gemini surfactants

Author

Yi-Yeol Lyu, Seung Hwan Yi, Jeong Kuk Shon, Chang, Seok, Lyong Sun Pu, Jae Eui Yie, Sang-Yun Lee, Char, Kookheon, Stucky, Galen D., and Kim, Ji Man

Subjects
Surface active agents -- Usage, Silicon compounds -- Analysis, Silicon compounds -- Chemical properties, Siloxanes -- Analysis, Siloxanes -- Chemical properties, Chemistry
Abstract

A new type of Gemini surfactant containing a siloxane moiety, which can yield highly stable mesoporous metal oxides after the removal of the surfactant via the nano-propping pathway, is described. Structures of the Gemini surfactant and a schematic diagram for the nano-propping pathway are presented.

Published
2004

4. Selective Synthesis of 1-butene through Positional Isomerisation of 2-butene over Mesoporous Silica MCM-41.

Author

Jong-Ki Jeon, Heejin Lee, Jin-Heong Yim, Yong Seung Kim, Seong Jun Lee, Young-Kwon Park, Jeong Kuk Shon, and Ji Man Kim

Subjects
ISOMERIZATION, BUTENE, SILICA, ALUMINUM, LANTHANUM, MULTICHIP modules (Microelectronics)
Abstract

A highly selective and active catalyst for the positional isomerisation of 2-butene into 1-butene has been developed by using a mesoporous silica, MCM-41. The yields of 1-butene as well as total conversion decrease when aluminium or lanthanum was added to the MCM-41 even though the amounts of acid sites increase. FT-IR spectra proved that the H site due to the silanol group may act as an active site for the positional isomerisation of 2-butene to 1-butene. [ABSTRACT FROM AUTHOR]

Published
2007
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6. Facile synthesis of highly ordered mesoporous silver using cubic mesoporous silica template with controlled surface hydrophobicity.

Author

Jeong Kuk Shon, Soo Sung Kong, Ji Man Kim, Chang Hyun Ko, Mingshi Jin, Yoon Yun Lee, Seong Hee Hwang, Jeong Ah Yoon, and Jong-Nam Kim

Subjects
*MESOPOROUS materials, *SILICA, *CHEMICAL templates, *CHEMICAL synthesis, *SILVER compounds, *SURFACE area, *HYDROPHOBIC surfaces, *MOLECULAR volume
Abstract

Highly ordered mesoporous silver, which exhibits well-defined mesopores, high surface area and pore volume, has been successfully obtained using a cubic mesoporous silica, KIT-6, with controlled surface hydrophobicity as the hard template. [ABSTRACT FROM AUTHOR]

Published
2009
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7. Preparation of Highly Ordered Mesoporous TiO2 Materials with Crystalline Framework from Different Mesostructured Silica Templates via Nanoreplication.

Author

Sung Soo Kim, Hyung Ik Lee, Jeong Kuk Shon, Jae Young Hur, Min Suk Kang, Sang Soo Park, Soo Sung Kong, Ji Ae Yu, Miran Seo, Donghao Li, Santosh Singh Thakur, and Ji Man Kim

Subjects
TITANIUM dioxide, SILICA, CHEMICAL templates, OXIDES, CHEMISTRY
Abstract

Highly ordered mesoporous TiO2 materials, exhibiting crystalline frameworks and various mesostructures, have been successfully obtained via nanoreplication using various kinds of mesoporous silicas as the rigid templates. [ABSTRACT FROM AUTHOR]

Published
2008
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8. Highly Ordered Mesoporous a-Mn2O3 for Catalytic Decomposition of H2O2 at Low Temperatures.

Author

Jung-Nam Park, Jeong Kuk Shon, Mingshi Jin, Seong Hee Hwang, Gwi Ok Park, Jin-Hyo Boo, Tae Hee Han, and Ji Man Kim

Subjects
MESOPOROUS materials, CATALYSIS, LOW temperatures, CHEMICAL reactions, OXYGEN
Abstract

Highly ordered mesoporous α-Mn2O3 with well-defined mesopores, high surface area, and high oxygen vacancy exhibits excellent catalytic activity toward H2O2 decomposition at low temperature. [ABSTRACT FROM AUTHOR]

Published
2010
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9. Highly Stable Mesoporous Metal Oxides Using Nano-Propping Hybrid Gemini Surfactants.

Author

Yl-Yeol Lyu, Seung Hwan Yi, Jeong Kuk Shon, Seok Chang, Lyong Sun Pu, Sang-Yun Lee, Jae Eui Yie, Kookheon Char, Stucky, Galen D., and Ji Man Kim

Subjects
*SURFACE active agents, *POROUS materials, *METALLIC oxides, *SILOXANES, *SILICON compounds, *ORGANIC chemistry
Abstract

The article describes a new type of Gemini surfactant containing a siloxane moiety, which can yield highly stable mesoporous metal oxides alter the removal of the surfactant via the nano-propping pathway. The article shows the structure of the surfactant and the schematic diagram for the nano-propping pathway. In the surfactant, one can control the length of the hydrophobic tail, the length of the siloxane moiety, and the length of the spacer between the positively charged headgroup and the siloxane moiety.

Published
2004
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