Youngkwang Kim

Korea Testing Laboratory

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Oh Joong Kwon

Incheon National University

Yung‐Eun Sung

Seoul National University

Mohanraju Karuppannan

Incheon National University

Taeho Lim

SK Group (South Korea)

Yu Seung Kim

Los Alamos National Laboratory

Joseph W. Lyding

University of Illinois Urbana-Champaign

Sandip Maurya

Los Alamos National Laboratory

Jong‐Soo Rhyee

Kyung Hee University

Jihyeok Song

Seoul National University

Kangguo Cheng

The University of Tokyo

Cooperative Institutions

Government of the Republic of Korea

Seoul National University

Pohang University of Science and Technology

Korea Institute of Science and Technology

Samsung (South Korea)

Sungkyunkwan University

Korea Advanced Institute of Science and Technology

Incheon National University

Yonsei University

University of Ulsan

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Application of the deuterium sintering process to improve the device design rule in reducing plasma induced damages

Youngkwang Kim Seok-Ha Lee Hyui-Seung Lee Bong-Seok Kim Jeong Yong Lee

The latent damage induced by plasma processes has been investigated by applying polarized constant current stress to the gate electrode of n- and p-MOSFETs. By optimizing the stressing conditions to effectively monitor the plasma damage, deuterium sintering is found to be very efficient at reducing plasma damage by suppressing the regeneration of interface states.

Plasma cleaning

10.1109/ppid.1999.798814

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Interaction of NaF, NaCl, and NaBr with Amorphous Ice Films. Salt Dissolution and Ion Separation at the Ice Surface

The Journal of Physical Chemistry C (2007)

Jung Hwan Kim Youngkwang Kim Heon Kang

We have studied the adsorption and dissolution phenomena of sodium halide salts (NaF, NaCl, and NaBr) at the surface of amorphous D2O−ice films for the temperature range 105−140 K by the techniques of low-energy sputtering, reactive ion scattering, and temperature-programmed desorption mass spectrometry. These salts readily dissociate to ions at the ice surface. The dissociated Na+ and F- ions migrate from the surface to the interior at temperatures above 125 K, while Cl- and Br- ions stay at the surface, leading to the spatial separation of ions near the ice surface. Br- shows a slightly higher propensity for residing at the surface than Cl-, most likely due to its less efficient solvation by surface water molecules. The ion separation process is driven by thermodynamic forces specific to the ions. The speed of ion migration depends strongly on ice temperature, indicating that the ion motion is limited by the diffusion of water molecules.

Amorphous ice

10.1021/jp0701587

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Citations (25)

Electrochemical pumps based on ion-pair membranes for separation of hydrogen from low-concentration mixtures

Nature Energy (2024)

Manjeet Chhetri Daniel P. Leonard Sandip Maurya Prashant Sharan Youngkwang Kim

Hydrogen purifier

High-pressure electrolysis

Compressed hydrogen

10.1038/s41560-024-01669-6

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Citations (1)

Direct formation of Pt catalyst on gas diffusion layer using sonochemical deposition method for the application in polymer electrolyte membrane fuel cell

International Journal of Hydrogen Energy (2018)

Youngkwang Kim Mohanraju Karuppannan Yung‐Eun Sung Taeho Lim Oh Joong Kwon

Oxidizing agent

Platinum black

Carbon fibers

Ionomer

Deposition

Gas diffusion electrode

10.1016/j.ijhydene.2018.04.088

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Citations (6)

Stabilizing oxygen intermediates on redox-flexible active sites in multimetallic Ni–Fe–Al–Co layered double hydroxide anodes for excellent alkaline and seawater electrolysis

Journal of Materials Chemistry A (2021)

Enkhbayar Enkhtuvshin Kang Min Kim Youngkwang Kim Sungwook Mihn So Jung Kim

Quaternary multimetallic LDHs have been developed through a facile metal–organic-framework derived electrochemical activation process. Ni–Fe–Al–Co quaternary LDHs show one of the best OER performances in alkaline and seawater electrolytes.

Oxygen evolution

Layered double hydroxides

Alkaline water electrolysis

10.1039/d1ta07126b

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Citations (47)

Heterostructured Mo₂N–Mo₂C Nanoparticles Coupled with N‐Doped Carbonized Wood to Accelerate the Hydrogen Evolution Reaction

Small Structures (2023)

Jangwon Bang In Kyu Moon Youngkwang Kim Jungwoo Oh

Hydrogen Evolution Reaction Electrodes In article 2200283, Jungwoo Oh and co-workers present high-performance hydrogen evolution reaction electrodes. These electrodes are achieved by synthesizing Mo2N-Mo2C heterostructures using low-cost, eco-friendly materials. The heterostructures effectively control the hydrogen adsorption properties of Mo2C on N-doped carbonized wood. This synthesis significantly enhances catalytic activity, increases exposure of active sites, and enables fast charge/bubble transfer.

Reversible hydrogen electrode

10.1002/sstr.202370019

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Nitrogen-rich hollow carbon spheres decorated with FeCo/fluorine-rich carbon for high performance symmetric supercapacitors

Journal of Materials Chemistry A (2018)

Mohanraju Karuppannan Youngkwang Kim Yung‐Eun Sung Oh Joong Kwon

A novel investigation was performed on fluorine-rich carbon shell formation on metal (Fe/Co/FeCo) surfaces and their contribution to capacitance enhancement was evaluated.

Carbon fibers

Fluorine

10.1039/c8ta00028j

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Citations (37)

Extremely Low Core-Loss and Enhanced Permeability Stability in Hot Press Sintered FeSi Soft Magnetic Composites by TiO2 and Fe Nanopowders

Muhammad Arif Dong-Hun Han Woojin Shin Seunghun Cha Changsun Pak

10.2139/ssrn.5133960

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Nitrogen and sulfur co-doped graphene-like carbon sheets derived from coir pith bio-waste for symmetric supercapacitor applications

Journal of Applied Electrochemistry (2018)

Mohanraju Karuppannan Youngkwang Kim Yung‐Eun Sung Oh Joong Kwon

Carbon fibers

Heteroatom

Coir

Amorphous carbon

10.1007/s10800-018-1276-1

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Citations (59)

Nafion-Based Proton-Exchange Membranes Built on Cross-Linked Semi-Interpenetrating Polymer Networks between Poly(acrylic acid) and Poly(vinyl alcohol)

ACS Applied Materials & Interfaces (2021)

Abu Zafar Al Munsur Bon-Hyuk Goo Youngkwang Kim Oh Joong Kwon Sae Yane Paek

We report semi-interpenetrating polymer network (semi-IPN) membranes prepared easily from a cross-linked network using poly(acrylic acid) (PAA) and poly(vinyl alcohol) (PVA) with interpenetrated Nafion for both proton-exchange membrane fuel cell (PEMFC) and proton-exchange membrane water electrolyzer (PEMWE) applications. Thermal esterification between PAA and PVA induced three-dimensional cross-linking to improve mechanical toughness and reduce hydrogen crossover, while the hydrophilic nature of the PAA–PVA-based cross-linked matrix still enhanced the water uptake (WU) and hence conductivity of the Nafion penetrant. The semi-IPN membrane (NPP-95) composed of Nafion, PAA, and PVA with a ratio of 95:2.5:2.5 showed a hexagonal cylindrical morphology and improved thermal, mechanical, and dimensional stability compared to a recast Nafion membrane (re-Nafion). The membrane was also highly effective at managing water due to its low WU and high conductivity. Furthermore, its hydrogen permeability was 49.6% lower than that of re-Nafion under the actual fuel cell operating conditions (at 100% RH and 80 °C). NPP-95 exhibited significantly improved conductivity and PEMFC performance compared to re-Nafion with a current density of 1561 mA/cm2 at a potential of 0.6 V and a peak power density of 1179 mW/cm2. Furthermore, in the PEMWE performances, NPP-95 displayed about a 1.5-fold higher current density of 4310 mA/cm2 at 2.0 V and much lower ohmic resistance than re-Nafion between 60 and 80 °C.

Nafion

Vinyl alcohol

Interpenetrating polymer network

Thermal Stability

Acrylic acid

Ionomer

10.1021/acsami.1c05662

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Citations (67)