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Papers for 2018~2019


We pursue valuable research and continuously publish papers. Through these publications, both large and small

we solve problems and contribute to the preservation of people, the environment, and the planet. 

  ACS Sustainable Chemistry & Engineering

   April 2018  vol 6 : 14857-14865 


“Ionic-liquid-derived nitrogen-doped carbon as electro-Fenton

  catalyst for removal of dye and pharmaceutical compounds”


    Young-Jin Ko, Hee-Gon Kim, Mingizem Gashaw Seid, Kangwoo Cho, Jae-Woo Choi, Seok Won Hong,

    Wook-Seong Lee.

    Abstract

    We investigated the activities of the ionic-liquid-derived (by pyrolysis) nitrogen-doped carbon as the

    electrocatalyst for the two-electron oxygen reduction reaction (ORR) and regeneration of divalent iron in the

    electro-Fenton process, focusing on the pyrolysis-temperature-dependent evolution of the doping structure.

    The results provided insight into the evolution of the catalytic activity as a function of the pyrolysis temperature.

    On the basis of the XPS N 1s analysis, the pyrolysis temperature was optimized at the 900 °C since the pyridinic/
    graphitic N structures which are known to be active sites for the ORR were maximized (4.29% pyridinic N and
    7.30% graphitic N). The carbonyl surface group, which is known to be an active site for the Fe3+/Fe2+ redox, was
    also maximized at the pyrolysis temperature of 900 °C (1.11%). This catalyst, adopting two simultaneously... ...


  Water Research

  15 November 2018  vol 145 : 287-296


“Strong chromate-adsorbent based on pyrrolic nitrogen

  structure: Anexperimental and theoretical study on the

  adsorption mechanism”



   Young-Jin Ko, Keunsu Choi, Soonjae Lee, Kyung-Won Jung, Hiroshi Mizuseki, Jae-Woo Choi, 

   WookSeong Lee.

   Abstract
    Chromate is considered a toxic contaminant in various water sources because it poses a risk to animal and
    human health. To meet the stringent limits for chromium in water and wastewater, pyrrolic nitrogen structure
    was investigated as a chromate adsorbent for aqueous solutions, employing a polypyrrole coating on carbon
    black. The characteristics of the adsorbent were analyzed by high-resolution transmission electron microscopy,
    energy-filtered transmission electron microscopy, and X-ray photoelectron spectroscopy. Chromate was adsorbed
    as both Cr(III) and Cr(VI). The chromate adsorption capacity increased (from 50.84 to 174.81 mg/g) with increasing
    amounts of pyrrole monomers (from 50 to 86%) in the adsorbent. The adsorption capacity was... ...

  International Journal of Hydrogen Energy

   11 October 2018  vol 43 : 19029 - 19037 


“Palladium Nanoparticles from Surfactant/Fast-Reduction

  Combination One-pot Synthesis for the Liquid fuel cell

  Applications”


   Young-Jin Ko, Jun-Yong Kim, Kyeong-Seok Lee, Jong-Keuk Park, Young-Joon Baik, Heon-Jin Choi,

   Wook-Seong Lee.

  Abstract
   We report a facile one-pot synthesis of well-dispersed Pd nanoparticles on a carbon nanofiber (CNF) support,
   achieved via the unique sequential processes of supramolecular self-assembly and fast reduction of the Pd source.
   Pd ions attached to the sulfate ends of sodium dodecyl sulfate (SDS) molecules self-assembled on a CNF,
   and subsequent fast reduction suppressed particle coarsening, in contrast to the slow reduction processes in
   previous works. The particle size and dispersion uniformity were comparable to those of particles synthesized by
   combined SDS/high-energy irradiation. The Pd nanoparticles prepared using the present one-pot approach... ...

  Carbon

  Feburary 2018  vol 127 :  31-40 


“Onion-like Carbon as Dopant/Modification-Free Electrocatalyst

  for [VO]₂+/[VO₂]+ Redox Reaction:

  Performance-Control Mechanism”



    Young-Jin Ko, Keunsu Choi, Jun-Yong Kim, Inho Kim, Doo Seok Jeong, Heon-Jin Choi,

    Hiroshi Mizuseki, Wook-Seong Lee.

    Abstract
    We investigate the application of the onion-like carbon (OLC) as an electrocatalyst for [VO]₂+/[VO₂]+ redox flow
    reaction; its performance (electrocatalytic activity and reversibility) strongly increases with the synthesis to peak
    at 1800 °C in 1000–2000 °C range. The dopant/modification-free, optimized redox performances of the OLC is
    comparable to some of the best data in the literature of various types of carbon materials with post-synthesis
    modifications or doping. Mechanism behind such performance optimization is investigated employing various
    physical/electrochemical analyses as well as the first-principles calculations. We demonstrate that the carbon
    dangling bonds or the crystalline defects... ...

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