Search

Your search keyword '"Kim, Ji Man"' showing total 720 results
Start Over Author "Kim, Ji Man"
720 results on '"Kim, Ji Man"'

107. Oxygen vacancy enriched Na+intercalated MnO2for high-performance MXene (Ti3C2Tx)-based flexible supercapacitor and electrocatalysis

Author

Thanigai Vetrikarasan, B., Nair, Abhijith R., Shinde, Surendra K., Kim, Dae-Young, Kim, Ji Man, Bulakhe, Ravindra N., Sawant, Shilpa N., and Jagadale, Ajay D.

Abstract

The increased interest in smart and portable electronic gadgets has led to the development of flexible and wearable energy storage systems. Herein, the oxygen vacancy-enriched Na-MnO2-xis synthesized using a simple, scalable, and inexpensive electrodeposition method. The oxygen vacancy enrichment effectively enhances the conductivity and reaction kinetics of the Na-MnO2electrode. The Na-MnO2-xfilm electrode reveals an excellent specific capacitance of 395 F g−1at the scan rate of 5 mV s−1with high capacitance retention of 85.9 % after 10,000 cycles at a current density of 5 A g−1. To verify the practicability, three asymmetric supercapacitors (ASCs) (Mn3O4//Ti3C2Tx, Na-MnO2//Ti3C2Tx, and Na-MnO2-x//Ti3C2Tx) are fabricated and their respective performances are contrasted. The Na-MnO2-x//Ti3C2TxASC reveals a maximum energy density of 25 Wh kg−1at the power density of 1000 W kg−1, along with excellent capacitance retention of 98.8 % after 10,000 cycles. In addition, to validate the suitability of Na-MnO2-xelectrode for flexible energy storage, the flexible Na-MnO2-x//Ti3C2TxASC is fabricated that operates in the potential window of 2 V in PVA: Na2SO4polymer gel electrolyte and delivers a high volumetric energy density of 510.3 mWh cm−3at a power density of 40,483 mW cm−3. Moreover, the electrocatalytic activity of Na-MnO2-xthin films reveals an overpotential of 439.7 and 381.2 mV to drive a current density of 10 mA cm−2corresponding to HER and OER, respectively. Therefore, the electrodeposited, oxygen vacancy-enriched Na-MnO2-xfilm electrode has great potential to be used for both flexible energy storage and electrocatalysis.

Published
2024
Full Text
View/download PDF

121. Raman scattering of true 1D van der Waals Nb2Se9 nanowires

Author

Lee, Junho, primary, Kim, Bum Jun, additional, Chung, You Kyoung, additional, Lee, Weon‐Gyu, additional, Choi, Ik Jun, additional, Chae, Sudong, additional, Oh, Seungbae, additional, Kim, Ji Man, additional, Choi, Jae‐Young, additional, and Huh, Joonsuk, additional

Published
2020
Full Text
View/download PDF

124. Open-tubular radially cyclical electric field-flow fractionation (OTR-CyElFFF): an online concentric distribution strategy for simultaneous separation of microparticles

Author

Liu, Lu, primary, Yang, Cui, additional, Liu, Cuicui, additional, Piao, Jishou, additional, Kaw, Han Yeong, additional, Cui, Jiaxuan, additional, Shang, Haibo, additional, Ri, Hyok Chol, additional, Kim, Ji man, additional, Jin, Mingshi, additional, and Li, Donghao, additional

Published
2020
Full Text
View/download PDF

130. Direct imaging of the pores and cages of three-dimensional mesoporous materials

Author

Sakamoto, Yasuhiro, Kaneda, Mizue, Terasaki, Osamu, Zhao, Dong Yuan, Kim, Ji Man, Stucky, Galen, Shin, Hyun June, and Ryoo, Ryong

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): Yasuhiro Sakamoto [1]; Mizue Kaneda [1]; Osamu Terasaki [1, 2, 7]; Dong Yuan Zhao [3]; Ji Man Kim [4]; Galen Stucky (corresponding author) [5, 7]; Hyun June Shin [6]; [...]

Published
2000
Full Text
View/download PDF

136. Improvement of hydrothermal stability of mesoporous silica using salts: reinvestigation for time-dependent effects

Author

Kim, Ji Man, Jun, Shinae, and Ryoo, Ryong

Subjects
Silica -- Research, Salts -- Research, Molecular sieves -- Research, Chemicals, plastics and rubber industries
Abstract

Research was conducted to reexamine the salt effect to solve the problem of poor reproducibility. The synthesis of mesoporous silica molecular sieves was obtained in the presence of salts under different experimental conditions. A hydrothermal stability test in boiling water, X-ray diffraction, infrared spectroscopy and scanning electron microscopy were used to analyze the hydrothermal stability and structure of the silica materials. It was found that the time dependence was a very important factor for the improvement of the hydrothermal stability.

Published
1999

141. Binary Oxide Catalyst Supported on Mesoporous CeO2 for Low Temperature Water-Gas Shift Reaction

Author

LI Chengbin, Kumarsrininasan Sivaranjani, Park Su‐Bin, Cho Hye‐Jin, LI Zhenghua, OH Hwa‐Yong, Choi Jong‐Ha, Kim Ji Man, and Hong Gyoung‐Hee

Subjects
Materials science, Inorganic chemistry, Biomedical Engineering, Oxide, Bioengineering, General Chemistry, Condensed Matter Physics, Water-gas shift reaction, Catalysis, chemistry.chemical_compound, Mesoporous organosilica, chemistry, General Materials Science, Mesoporous material
Published
2016

Catalog

Books, media, physical & digital resources
See catalog results