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Your search keyword '"Jung, Ji‐Won"' showing total 9 results
Start Over Author "Jung, Ji‐Won" Journal acs nano
9 results on '"Jung, Ji‐Won"'

1. Hierarchically Assembled Cobalt Oxynitride Nanorods and N-Doped Carbon Nanofibers for Efficient Bifunctional Oxygen Electrocatalysis with Exceptional Regenerative Efficiency

Author

Yoon, Ki Ro, primary, Hwang, Chang-Kyu, additional, Kim, Seung-hoon, additional, Jung, Ji-Won, additional, Chae, Ji Eon, additional, Kim, Jun, additional, Lee, Kyung Ah, additional, Lim, Ahyoun, additional, Cho, Su-Ho, additional, Singh, Jitendra Pal, additional, Kim, Jong Min, additional, Shin, Kihyun, additional, Moon, Byung Moo, additional, Park, Hyun S., additional, Kim, Hyoung-Juhn, additional, Chae, Keun Hwa, additional, Ham, Hyung Chul, additional, Kim, Il-Doo, additional, and Kim, Jin Young, additional

Published
2021
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3. Lithium–Air Batteries: Air-Breathing Challenges and Perspective

Author

Kang, Jin-Hyuk, primary, Lee, Jiyoung, additional, Jung, Ji-Won, additional, Park, Jiwon, additional, Jang, Taegyu, additional, Kim, Hyun-Soo, additional, Nam, Jong-Seok, additional, Lim, Haeseong, additional, Yoon, Ki Ro, additional, Ryu, Won-Hee, additional, Kim, Il-Doo, additional, and Byon, Hye Ryung, additional

Published
2020
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8. Brush-Like Cobalt Nitride Anchored Carbon Nanofiber Membrane: Current Collector-Catalyst Integrated Cathode for Long Cycle Li–O2Batteries

Author

Yoon, Ki Ro, Shin, Kihyun, Park, Jiwon, Cho, Su-Ho, Kim, Chanhoon, Jung, Ji-Won, Cheong, Jun Young, Byon, Hye Ryung, Lee, Hyuk Mo, and Kim, Il-Doo

Abstract

To achieve a high reversibility and long cycle life for lithium–oxygen (Li–O2) batteries, the irreversible formation of Li2O2, inevitable side reactions, and poor charge transport at the cathode interfaces should be overcome. Here, we report a rational design of air cathode using a cobalt nitride (Co4N) functionalized carbon nanofiber (CNF) membrane as current collector-catalyst integrated air cathode. Brush-like Co4N nanorods are uniformly anchored on conductive electrospun CNF papers via hydrothermal growth of Co(OH)F nanorods followed by nitridation step. Co4N-decorated CNF (Co4N/CNF) cathode exhibited excellent electrochemical performance with outstanding stability for over 177 cycles in Li–O2cells. During cycling, metallic Co4N nanorods provide sufficient accessible reaction sites as well as facile electron transport pathway throughout the continuously networked CNF. Furthermore, thin oxide layer (<10 nm) formed on the surface of Co4N nanorods promote reversible formation/decomposition of film-type Li2O2, leading to significant reduction in overpotential gap (∼1.23 V at 700 mAh g–1). Moreover, pouch-type Li-air cells using Co4N/CNF cathode stably operated in real air atmosphere even under 180° bending. The results demonstrate that the favorable formation/decomposition of reaction products and mediation of side reactions are hugely governed by the suitable surface chemistry and tailored structure of cathode materials, which are essential for real Li–air battery applications.

Published
2018
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9. A High-Capacity and Long-Cycle-Life Lithium-Ion Battery Anode Architecture: Silver Nanoparticle-Decorated SnO 2 /NiO Nanotubes.

Author

Kim C, Jung JW, Yoon KR, Youn DY, Park S, and Kim ID

Abstract

The combination of high-capacity and long-term cyclability has always been regarded as the first priority for next generation anode materials in lithium-ion batteries (LIBs). To meet these requirements, the Ag nanoparticle decorated mesoporous SnO 2 /NiO nanotube (m-SNT) anodes were synthesized via an electrospinning process, followed by fast ramping rate calcination and subsequent chemical reduction in this work. The one-dimensional porous hollow structure effectively alleviates a large volume expansion during cycling as well as provides a short lithium-ion duffusion length. Furthermore, metallic nickel (Ni) nanoparticles converted from the NiO nanograins during the lithiation process reversibly decompose Li 2 O during delithiation process, which significantly improves the reversible capacity of the m-SNT anodes. In addition, Ag nanoparticles uniformly decorated on the m-SNT via a simple chemical reduction process significantly improve rate capability and also contribute to long-term cyclability. The m-SNT@Ag anodes exhibited excellent cycling stability without obvious capacity fading after 500 cycles with a high capacity of 826 mAh g -1 at a high current density of 1000 mA g -1 . Furthermore, even at a very high current density of 5000 mA g -1 , the charge-specific capacity remained as high as 721 mAh g -1 , corresponding to 60% of its initial capacity at a current density of 100 mA g -1 .

Published
2016
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