Euntae Yang
Gwangju Institute of Science and Technology
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Featured researches published by Euntae Yang.
Bioresource Technology | 2015
Mi-Young Lee; Kyoung-Yeol Kim; Euntae Yang; In S. Kim
In order to enhance hydrogen production by facilitated proton transport through a forward osmosis (FO) membrane, the FO membrane was integrated into microbial electrolysis cells (MECs). An improved hydrogen production rate was obtained in the FO-MEC (12.5±1.84×10(-3)m(3)H2/m(3)/d) compared to that of the cation exchange membrane (CEM) - MEC (4.42±0.04×10(-3)m(3)H2/m(3)/d) during batch tests (72h). After an internal resistance analysis, it was confirmed that the enhanced hydrogen production in FO-MEC was attributed to the smaller charge transfer resistance than in the CEM-MEC (90.3Ω and 133.4Ω respectively). The calculation of partial internal resistance concluded that the transport resistance can be substantially reduced by replacing a CEM with a FO membrane; decrease of the resistance from 0.069Ωm(2) to 5.99×10(-4)Ωm(2).
Environmental Technology | 2015
Euntae Yang; Mi-Jin Choi; Kyoung-Yeol Kim; Kyu-Jung Chae; In S. Kim
Microbial desalination cells (MDCs) are modified microbial fuel cells (MFCs) that concurrently produce electricity and desalinate seawater, but adding a desalination compartment and an ion-exchange membrane may increase the internal resistance (Ri), which can limit the cell performance. However, the effects of a desalination chamber and initial NaCl concentrations on the internal resistances and the cell performances (i.e. Coulombic efficiency (CE), current and power density) of MDCs have yet to be thoroughly explored; thus, the cell performance and Ri distributions of MDCs having different initial concentrations and an MFC having no desalination chamber were compared. In the MDCs, the current and power density generation increased from 2.82 mA and 158.2 mW/m2 to 3.17 mA and 204.5 mW/m2 when the initial NaCl concentrations were increased from 5 to 30 g/L, as a consequence of the internal resistances decreasing from 2432.0 to 2328.4 Ω. And even though the MFC has a lower Ri than the MDCs, lower cell performances (current: 2.59 mA; power density: 141.6 mW/m2 and CE: 62.1%) were observed; there was no effect of improved junction potential in the MFC. Thus, in the MDCs, the higher internal resistances due to the addition of a desalination compartment can be offset by reducing the electrolyte resistance and improving the junction potential at higher NaCl concentrations.
Desalination and Water Treatment | 2013
Euntae Yang; Mi-Jin Choi; Kyoung-Yeol Kim; In S. Kim
Abstract We are focusing on the enhancement of microbial electrodialysis cell (MEDC) performance by alleviation of pH gradient between the anode and cathode chambers by setting up a direct proton transfer pathway, which allows protons to migration unconstrainedly, with three different membranes ultrafiltration membrane (UF), anion-exchange membrane (AEM), cation-exchange membrane (CEM)) in the MEDC. Setting up a direct proton transfer pathway between the anode and cathode chamber in the MEDC abated pH gradient by up to about 54%. Also, hydrogen production and salt removal efficiency were enhanced. In a comparison of membranes for a direct proton transfer pathway, an AEM has the best performance for reduction for pH gradient because of a higher proton transfer by phosphate anions, but due to the high substrate permeability of an AEM, the hydrogen production with AEM was lower than that with UF—which highest hydrogen production was observed with UF (5.77 ± 0.54 mL, 0.55 ± 0.14 mL/h). In terms of salt remova...
RSC Advances | 2017
Jun-ho Song; Chang-Min Kim; Euntae Yang; Moon-Ho Ham; In S. Kim
Nitrogen-doped graphene was synthesized by hydrothermal treatment of graphene oxide with ammonia at different doping temperatures. As the doping temperature increased, each type of nitrogen-bonding showed different tendencies. There was a high proportion of pyrrolic-N, but the proportion was relatively lower with temperature. Despite its smaller content, pyridinic-N plays a prominent part.
Desalination and Water Treatment | 2016
Euntae Yang; Kyoung-Yeol Kim; Kyu-Jung Chae; Mi-Young Lee; In S. Kim
AbstractRecent forward osmosis–bioelectrochemical hybrid systems (FO-BESs) have been designed to simultaneously produce bio-energy and clean water from wastewater. Asymmetric forward osmosis (FO) membranes are a crucial component for determining FO-BES performance, but only cellulose triacetate (CTA NW) membranes in the same orientation have been applied to FO-BESs. In this work, both CTA NW and polyamide (PA) membranes were tested in two membrane orientations (active layer facing feed solution or anolyte and support layer facing feed solution). For an in-depth understanding of the FO membranes, properties were investigated using scanning electron microscopy, contact angle, impedance spectroscopy, and proton transport analyses. The electricity generation and water extraction in FO-BESs having these two FO membranes in different orientations were then evaluated. Based on membrane characterization, PA seemed to be a proper membrane for the FO-BES because of higher hydrophilicity, lower membrane thickness, l...
Archive | 2015
In S. Kim; Euntae Yang; Mi-Jin Choi; Kyu-Jung Chae
Bioelectrochemical hydrogen production is a new technology that uses electrochemically active bacteria under an applied voltage to convert organic matter into hydrogen. This technology is generally referred to as a microbial electrolysis cell (MEC). MECs have gained attention as a novel alternative hydrogen production method because of their high hydrogen conversion efficiency, low energy requirement, and their applicability to many organic substrates. Consequently, the technology has been rapidly advanced. However, various technical challenges remain prior to scale-up and their practical application. This chapter deals with development of MEC technology and includes the following sections: definition and history of hydrogen production, principles and advantages, critical factors affecting MEC performance, anodic biocatalysts and technical challenges, and perspectives and outlooks of hydrogen production from organic waste.
Water Research | 2014
Kyoung-Yeol Kim; Euntae Yang; Mi-Young Lee; Kyu-Jung Chae; Chang-Min Kim; In S. Kim
Chemical Engineering Journal | 2013
Kyoung-Yeol Kim; Kyu-Jung Chae; Mi-Jin Choi; Euntae Yang; Moon Hyun Hwang; In S. Kim
Chemical Engineering Journal | 2014
Kyu-Jung Chae; Kyoung-Yeol Kim; Mi-Jin Choi; Euntae Yang; In S. Kim; Xianghao Ren; Mooseok Lee
Journal of Membrane Science | 2016
Euntae Yang; Kyu-Jung Chae; Abayomi Babatunde Alayande; Kyoung-Yeol Kim; In S. Kim