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Low Permeable Hydrocarbon Polymer Electrolyte Membrane for Vanadium Redox Flow Battery
Jung, Ho-Young,Moon, Geon-O,Jung, Seunghun,Kim, Hee Tak,Kim, Sang-Chai,Roh, Sung-Hee American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.4
<P>Polymer electrolyte membrane (PEM) confirms the life span of vanadium redox flow battery (VRFB). Products from Dupont, Nafion membrane, is mainly used for PEM in VRFB. However, permeation of vanadium ion occurs because of Nafion's high permeability. Therefore, the efficiency of VRFB decreases and the prices becomes higher, which hinders VRFB's commercialization. In order to solve this problem, poly(phenylene oxide) (PPO) is sulfonated for the preparation of low-priced hydrocarbon polymer electrolyte membrane. sPPO membrane is characterized by fundamental properties and VRFB cell test.</P>
Seunghun Jung,Seunghwan Lee 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
The genus Halictus Latreille, 1804 and Seladonia Robertson, 1918 are nearly cosmopolitan group, consisting of more than 206 described species worldwide except Antarctica region. In previous taxonomic and phylogenetic research, this genus regarded as a sister group of genus Halictus. In this study, a total of two genera seven species were reviewed from Korean peninsula (three Halictus, four Seladonia) with three new records (Halictus hedini hedini, Seladonia confusa, S. henanensis). A key to species and images of adult are provided.
Jung, Seunghun,Choi, Byungchul,Park, Suhan,Lee, Dong-Weon,Kim, Young Bae Elsevier 2017 International journal of hydrogen energy Vol.42 No.19
<P><B>Abstract</B></P> <P>A computational study of hydrogen production by a dimethyl ether reformer combined with a catalytic combustor is conducted to investigate its feasibility for on-board automotive applications. The combined reactor has a stacked channel structure consisting of alternating reformer monoliths and catalytic combustor monoliths on a heat-conducting substrate. The inner surfaces of the walls of each monolith are coated with reforming and combusting catalysts, respectively. The effects of the feeding flow rate, thermal conductivity of the substrate, and porosity of the catalyst layer on the hydrogen production efficiency of the proposed combined reactor are investigated to determine the optimal design and operating conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Compact combined DME reformer for hydrogen production is proposed and computationally studied. </LI> <LI> To achieve the maximum hydrogen yield, proper flow rate ratio between reformer and combustor is required. </LI> <LI> Methanol and carbon monoxide emission is monitored according to various operating conditions. </LI> <LI> Lower thermal conductivity of substrate leads to elevated reactor temperature and better hydrogen yield. </LI> </UL> </P>