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최재영(Choi, Jaiyoung),설용건(Shul, Yonggun) 한국신재생에너지학회 2014 신재생에너지 Vol.10 No.2
This study is intended to analyze the appropriate scope for 9.9MW biomass cogeneration, feasibility and sensitivity according to changing market situation. In the study, the heat load is classified into three types to predict heat sales and find out the appropriate scope of thermal business that is operated in CHP 34.42 Gcal/h, PLBwg 70 Gcal/h of cogeneration. the feasibility is estimated based on internal rate of return (IRR) and net present value(NPV). the sensitivity is analyzed in terms of biomass fuel cost, unit price of heating cost, investment cost, SMP unit price and REC unit price.
Yonughwan Lee,Jonghyuck Lee,Yonggun Shul,임상우 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.1
In this study, the mechanism of vertically aligned porous silicon formation was examined. Silicon wafers with various resistivities and electrolytes containing different HF concentrations were used to explain porous silicon formation by the reaction at the silicon/electrolyte interface. Total pore volume increased proportionally to the current applied and anodization time. As the concentration of HF increased, pore depth and total pore volume formed in silicon anodization increased, then decreased beyond the optimum point. At a given applied current, total pore volume formed by anodization increased with an increase in resistivity of silicon wafer, but then decreased. From the mechanism of silicon etching and schematic isoetch contour of silicon suggested in this study, it is concluded that the formation of porous silicon is determined by an accumulation of F near the silicon/electrolyte interface in silicon anodization. # 2007 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Lee, Seokkyu,Jang, Wonbong,Choi, Seunghyuk,Tharanikkarasu, Kannan,Shul, Yonggun,Han, Haksoo Wiley Subscription Services, Inc., A Wiley Company 2007 Journal of applied polymer science Vol.104 No.5
<P>Semi-interpenetrating polymer network (semi-IPN) membranes based on novel sulfonated polyimide (SPI) and poly (ethylene glycol) diacrylate (PEGDA) have been prepared for the fuel cell applications. SPI was synthesized from 1,4,5,8-naphthalenetetracarboxylic dianhydride, 4,4′-diaminobiphenyl 2,2′-disulfonic acid, and 2-bis [4-(4-aminophenoxy) phenyl] hexafluoropropane. PEGDA was polymerized in the presence of SPI to synthesize semi-IPN membranes of different ionic contents. These membranes were characterized by determining, ion exchange capacity, water uptake, water stability, proton conductivity, and thermal stability. The proton conductivity of the membranes increased with increasing PEGDA content in the order of 10<SUP>−1</SUP> S cm<SUP>−1</SUP> at 90°C. These interpenetrating network membranes showed higher water stability than the pure acid polyimide membrane. This study shows that semi-IPN SPI membranes based on PEGDA which gives hydrophilic group and structural stability can be available candidates comparable to Nafion® 117 over 70°C. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007</P>
나희수(Na, Heesoo),황형권(Hwang, Hyungkwon),이찬민(Lee, Chanmin),설용건(Shul, Yonggun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
There is widespread effort to develop polymer membranes in place of Nafion for high temperature polymer electrolyte membrane fuel cell(PEMFC). In our study, SiO2 membranes are arranged by electrospinning method. For impregnation solution, the modified sulfonated poly(ether ether ketone)(SPEEK) polymer is prepared from sulfonation, sulfochlorination, partial reduction and lithiation reaction. The modified polymer is cross-linked with 1,4-diiodobetane in NMP solvent and then blended with Heteropoly acid(HPA). The characterization of membranes is confimed by FT-IR, Thermogravimetry(TGA), water uptake test and single cell performance test for PEMFC, etc. The composite membrane shows satisfactory thermal and mechanical properties. Beside, The membrane exhibits good ion exchange capacity and high proton conductivity. As a result, The composite membrane is promising as an alternative membrane in high temperature PEMFC.
Synthesis and characterization of new functional poly(urethane-imide) crosslinked networks
Park, Mi-Hee,Jang, Wonbong,Yang, Seung-Jin,Shul, Yonggun,Han, Haksoo Wiley Subscription Services, Inc., A Wiley Company 2006 Journal of applied polymer science Vol.100 No.1
<P>To synthesize new functional poly(urethane-imide) crosslinked networks, soluble polyimide from 2,2′-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride, 4,4′-oxydianiline, and maleic anhydride and polyurethane prepolymer from polycaprolactone diol, tolylene 2,4-diisocyanate and hydroxyl ethyl acrylate were prepared. Poly(urethane-imide) thin films were finally prepared by the reaction between maleimide end-capped soluble polyimide (PI) and acrylate end-capped polyurethane (PU). The effect of polyurethane content on dielectric constant, residual stress, morphology, thermal property, and mechanical property was studied by FTIR, prism coupler, Thin Film Stress Analyzer (TFSA), XRD, TGA, DMTA, and Nano-indentation. Dielectric constant of poly(urethane-imide) thin films (2.39–2.45) was lower than that of pure polyimide (2.46). Especially, poly(urethane-imide) thin films with 50% of PU showed lower dielectric constant than other poly(urethane-imide) thin films did. Lower residual stress and slope in cooling curve were achieved in higher PU content. Compared to typical polyurethane, poly(urethane-imide) thin films exhibited better thermal stability due to the presence of the imide groups. The glass transition temperature, modulus, and hardness decreased with increase in the flexible PU content even though elongation and thermal expansion coefficient increased. Finally, poly(urethane-imide) thin films with low residual stress and dielectric constant, which are strongly affected by the morphological structure, chain mobility, and modulus, can be suggested to apply for electronic devices by variation of PU. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 113–123, 2006</P>
The development of PEMFC cathode using polyol method with directly grown CNT on carbon paper
옥진희(Ok, Jinhee),이준기(Rhee, Junki),Altalsukh, Dorjgotov,박상선(Park, Sangsun),설용건(Shul, Yonggun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Since the discovery of the carbon nanotube(CNTs), they have attracted much attention because of unique properties that may impact many fields of science and technology. The considerable properties of CNTs include high surface area, outstanding thermal, electrical conductivity and mechanical stability. However, uniform deposition of Pt nanoparticles on carbon surface remains inaccessible territory because of the inert carbon surface. In this study, we prepared directly oriented CNTs on carbon paper as a catalyst support in cathode electrode. carbon surface was functionalized using aryl diazonium salt for increasing adhesion of Ni particles which is precursor for growing CNTs. For fabricate electrode, CNTs on carbon paper were grown by chemical vapor deposition using Ni catalyst and Pt nanoparticles were deposited on CNTs oriented carbon paper by polyol method. The performance was measured using Proton electrolyte Membrane Fuel Cell(PEMFC). The structure and morphology of the Pt nanoparticles on CNTs were characterized by Scanning electron Microscopy(SEM) and Transmission electron Microscopy (TEM). The average diameter of Pt nanoparticles was 3nm.
Kang, Segoo,Jung, Doo-Hwan,Shin, Junhwa,Kim, Sang-Kyung,Shul, Yonggun,Peck, Dong-Hyun Elsevier 2014 Journal of membrane science Vol.459 No.-
Proton exchange membranes were prepared by y-ray radiation-induced grafting onto ETFE films, crosslinking with styrene/divinylbenzene (DVB) mixtures and a subsequent sullonation. Effects of the DVB content on the membrane properties such as ion exchange capacity (lEC), proton conductivity, and methanol permeability were investigated. Membrane-electrode assemblies (MEA) containing the prepared membranes were fabricated for direct methanol fuel cells (DMFC), and the MEA performance was examined in operation with various concentrations of methanol. Durability of the MEAs was investigated using a 3 M methanol solution for 1000 h, and the polarization curves and impedance spectra were measured. Physicochemical properties of catalysts and membrane before and after the long-term operation were analyzed by TOM, XRD, lEC, and proton conductivity. Performance and durability of the selected membranes were also confirmed in the operation of a 6-cell stack with 3 M methanol solution. (C) 2014 Elsevier B.V. All rights reserved,