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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean hydrogen and new energy society
Journal Basic Information
Journal DOI :
The Korean Hydrogen and New Energy Society
Editor in Chief :
Volume & Issues
Volume 22, Issue 6 - Dec 2011
Volume 22, Issue 5 - Oct 2011
Volume 22, Issue 4 - Aug 2011
Volume 22, Issue 3 - Jun 2011
Volume 22, Issue 2 - Apr 2011
Volume 22, Issue 1 - Feb 2011
Selecting the target year
Effect of Support in HI Decomposition Reaction using Pt Catalyst
Ko, Yun-Ki ; Park, Chu-Sik ; Kang, Kyoung-Soo ; Bae, Ki-Kwang ; Kim, Young-Ho ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 415~423
HI decomposition step certainly demand catalytic reaction for efficient production of hydrogen in SI process. Platinum catalyst can apply to HI decomposition reaction as well as hydrogenation or dehydrogenation. Generally, noble metal is used as catalyst which is loaded form for getting high dispersion and wide active area. In this study, Pt was loaded onto zirconia, ceria, alumina, and silica by impregnation method. HI decomposition reaction was carried out under the condition of
, 1atm, and
(WHSV) in a fixed bed reactor for measuring catalytic activity. And property of a catalyst was observed by BET, TEM, XRD and chemisoption analysis. On the basis of experimental results, we discussed about conversion of HI according to physical properties of the loaded Pt catalyst onto each support.
Phase Separation Characteristics of Low Temperature Bunsen Reactions In Sulfur-Iodine Hydrogen Production Process
Han, Sang-Jin ; Lee, Kwang-Jin ; Kim, Hyo-Sub ; Kim, Young-Ho ; Park, Chu-Sik ; Bae, Ki-Kwang ; Lee, Jong-Gyu ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 424~431
The Sulfur-Iodine(SI) thermochemical hydrogen production process consists of three sections, which are so called the Bunsen reaction section, the
decomposition section and the HI decomposition section. In order to identify the phase separation characteristics in the reaction conditions with the high solubility of
, we conducted the Bunsen reaction at the low temperatures, ranging from 283 to 298K, with the
molar ratios of 2.5/16.0 and 3.5/16.0. The molar ratios of HI/
products obtained from low temperature Bunsen reactions were ca. 2, indicating that there were no side reactions. The amount of reacted
was increased with decreasing the temperature, while the amounts of unreacted
were decreased. In the phase separation of the products, the amount of a
phase was increased with decreasing the temperature, though the temperature has little affected on HI and
Effect of TiO
Nanotube Length on Photocatalytic Activity with Different Light Intensities: Cr(VI) Reduction and Hydrogen Production
Joo, Hyun-Ku ; Shim, Eun-Jung ; Lee, Jae-Min ; Yoon, Jae-Kyung ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 432~442
electrodes (ATTEs) with three noticeably different lengths are prepared to determine their optimum length for the photo-driven activity in the reaction of Cr(VI) reduction and hydrogen evolution. The ATTEs with ethylene glycol have longer
) than those with hydrfluoric acid (0.6-0.8
). These samples, which differ only in the length of the tubes, with a wall thickness of ca. 20 nm, consist mainly of an anatase crystalline phase after heat treatment at
, since the anatase crystallites at the tube walls do not undergo transformation into rutile phase, due to the constraints imposed by the wall thickness. Among them, the medium size (ca. 8
) tubes provide the optimum conditions, irrespective of the light intensity, which is explained in terms of the correlation between the amount of photons and the adsorbed electron acceptors and their location. Photocatalytic Cr(VI) reduction leads to ca. 60% reduction of Cr(VI) even under 1 sun irradiation with the medium-sized anodized
tubes, but only ca. 20% with the short- and long-sized tubes. For hydrogen evolution, tubes longer than 8
do not exhibit better performance with any light intensity.
Redox Property of the Supported Fe
Kim, Jae-Ho ; Kang, Kyoung-Soo ; Bae, Ki-Kwang ; Kim, Young-Ho ; Kim, Chang-Hee ; Cho, Won-Chul ; Park, Chu-Sik ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 443~450
The three-reactor chemical-looping process (TRCL) for the production of hydrogen from natural gas is attractive for both
capture and hydrogen production. In this study, redox property of
were studied with temperature programmed oxidation/reduction (TPO/R) experiment. All metal oxides were prepared by ball mill method. Metal oxides supported with
showed the good redox property in TPO and TPR tests. Reduction behavior was matched well the theoretical reduction mechanism. Metal oxides supported with
formed a solid solution (
showed more narrow reaction range and lower reaction temperature than
Photo-Fermentative Hydrogen Production by Rhodobacter Sphaeroides KD131 under Various Culture Conditions
Son, Han-Na ; Kim, Dong-Hoon ; Lee, Won-Tae ; Rhee, Young-Ha ; Kim, Mi-Sun ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 451~457
Purple non-sulfur (PNS) bacterium
KD131 was studied with the aim of achieving maximum hydrogen production using various carbon and nitrogen sources at different pH conditions. Cells grew well and produced hydrogen using
or glutamate as a nitrogen source in combination with a carbon substrate, succinate or malate. During 48h of photo-heterotrophic fermentation under 110
illumination using a halogen lamp at
, 67% of 30mM succinate added was degraded and the hydrogen yield was estimated as 3.29mol
/mol-succinate. However, less than 30% of formate was consumed and hydrogen was not produced due to a lack of genes coding for the formate-hydrogen lyase complex of strain KD131. Initial cell concentrations of more than 0.6g dry cell weight/L-culture broth were not favorable for hydrogen evolution by cell aggregation, thus leading to substrate and light unavailability. In a modified Sistrom's medium containing 30mM succinate with a carbon to nitrogen ratio of 12.85 (w/w), glutamate produced 1.40-fold more hydrogen compared to ammonium sulfate during the first 48h. However, ammonium sulfate was 1.78-fold more effective for extended cultivation of 96h. An initial pH range from 6.0 to 9.0 influenced cell growth and hydrogen production, and maintenance of pH 7.5 during photofermentation led to the increased hydrogen yield.
The Hydrogenation Behaviors of V-xAl (x=1, 5wt.%) Composites by Mechanical Alloying
Kim, Kyeong-Il ; Hong, Tae-Whan ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 458~464
Recently, one of the hydrogen production methods has attracted using dense metallic membrane. It has high hydrogen permeation and selectivity which hardly could adopt industrial product because of high cost, hydrogen embrittlment and thermal stability. Meanwhile, vanadium has high hydrogen solubility and it use to instead of Pd-Ag amorphous membrane. Aluminum carried out blocking hydrogen diffusion on grain boundary therefore protecting hydrogen embrittlement. Most of dense metallic membrane is solution diffusion mechanism. The solution diffusion mechanism was very similar hydrogen storing steps such as steps of metal hydride. Thus, V-Al composites were fabricated to use hydrogen induced mechanical alloying. The fabricated V-Al composites were characterized by XRD, SEM, EDS and simultaneous TG/DSC analyses. The hydrogenation behaviors were evaluated using a Sievert's type automatic PCT apparatus. The hydrogenation behaviors of V-Al composites was evaluated too low hydrogen stored capacity and fast hydrogenation kinetics. In PCI results, V-Al composites had low hydrogen solubility, in spite of that, hydrogen kinetics was calculated very fast and hydrogen absorption/desorption contents were same capacity.
Reaction Characteristics of WGS Catalyst with Fraction of Catalyst in a Batch Type Fluidized Bed Reactor
Ryu, Ho-Jung ; Hyun, Ju-Soo ; Kim, Ha-Na ; Hwang, Taek-Sung ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 465~473
To find the optimum mixing ratio of WGS catalyst with
absorbent for SEWGS process, water gas shift reaction tests were carried out in a fluidized bed reactor using ShiftMax210 catalyst and sand (as a substitute for
absorbent). WGS catalyst content, gas velocity, and steam/CO ratio were considered as experimental variables. CO conversion increased as the catalyst content increased during water gas shift reaction. Variations of the CO conversion with the catalyst content were small at low gas velocity. However, those variations increased at higher gas velocity. Within experimental range of this study, the optimum operating condition(steam/CO ratio=3, gas velocity = 0.03 m/s, catalyst content=10 wt.%) to get high CO conversion and
capture efficiency was confirmed. Moreover, long time water gas shift reaction tests up to 20 hours were carried out for two cases (catalyst content = 10 and 20 wt.%) and we could conclude that the WGS reactivity at those conditions was maintained up to 20 hours.
Experiment of CO Cleaning Process in DME Autothermal Reformate Gas for PEMFC Application
Choi, Seung-Hyeon ; Bae, Joong-Myeon ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 474~480
Hydrocarbon is required to be converted to pure hydrogen without carbon monooxide (CO) for polymer exchange membran fuel cell (PEMFC) applications. In this paper, CO cleaning processes as the downstream of Dimethyl ehter (DME) autothermal reforming process were performed in micro-reactors. Our study suggested two kinds of water gas shift (WGS) reaction process: High Temperature shift (HTS) - Low Temperature shift (LTS), Middle temperature shift (MTS). Firstly, using perovskite catalyst for MTS was decreased effieiciency since methanation. Using HTS-LTS the CO concentration was decreased about 2% (
free) with the reaction temperature of
for HTS and LTS, respectively. As the final stage of CO cleaning process, preferential oxidation (PROX) was applied. The amount of additional oxygen need 2 times of stoichiometric at
. The total conversion reforming efficiency of 75% was gained.
Modeling of Hydrogen Recirculation System for Fuel Cell Vehicle
Kim, Jae-Hoon ; Noh, Young-Gyu ; Jeon, Ui-Sik ; Lee, Jong-Hyun ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 481~487
A fuel cell vehicle using a polymer electrolyte membrane fuel cell (PEM FC) as power source produces electric power by consuming the fuel, hydrogen. The unconsumed hydrogen is recirculated and reused to gain higer stack efficiency and to maintain the humidity in the anode side of the stack. So it is needed considering fuel efficiency to recirculated hydrogen. In this study, the indirect hydrogen recirculation flow rate measurement method for fuel cell vehicle is presented. By modeling of a convergent nozzle ejector and a hydrogen recirculation blower for the hydrogen recirculation of a PEM FC, the hydrogen recirculation flow rate was calculated by means of the mass balance and heat balance at Anode In/Outlet.
Mechanical Properties of EPDM Gasket after Long-Term Operations
Wu, Lan ; Kim, Seon-Hak ; Cheon, Seung-Ho ; Kim, Jin-Su ; Hyun, Deok-Su ; Kim, Byeong-Heon ; Lee, Sung-Kun ; Jeong, Jae-Hoon ; Ji, Duk-Jin ; Oh, Byeong-Soo ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 488~494
Gasket plays an important role on sealing of the polymer electrolyte membrane fuel cell (PEMFC) stack. Stack requires gaskets in each cell to keep the hydrogen and air/oxygen within their respective regions. The failure of the gasket creates the problems of fuel leakage, mixing, damage on parts and can be a direct reason for the degrading the efficiency of fuel cell. The purpose of this paper researches on how mechanical properties of EPDM gasket in PEMFC are changed after long-term operations. The EPDM (ethylenepropylene-diene monomer) gaskets are obtained from the stack after long-term operations. DMA (dynamic mechanical analysis) is conducted to access the change of mechanical properties of the EPDM gasket. SEM/EDS (scanning electron microscope/energy dispersive spectroscopy) was used to show the surface topography and chemical characterization on the sample surface.
Effects of the Surface Coating Treatment of Cathode Materials on the Electrochemical Characteristics of Ni-MH Secondary Batteries
Kim, Byoung-Soub ; Yang, Dong-Cheol ; Park, Bong-Gi ; Park, Choong-Nyeon ; Park, Chan-Jin ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 495~503
The sealed nickel-metal hydride (Ni-MH) secondary battery are primarily used as energy storage for the HEV. But, the research on Ni-MH battery has focused on anode materials. In the present study, we investigate to improve the electrochemical characteristics of Ni-MH batteries using the surface treatment of
cathode by CoOOH. Surface treated
cathode showed significant improvement in the activation behavior, rate capability, charge retention, and cycle life of the batteries were significantly improved. In addition, the surface treated electrode exhibited the higher overvoltage for oxygen evolution than the untreated electrode. This phenomenon indicates that the charge efficiency can be improved by suppressing the oxygen evolution on cathode.
Synthesis and Electrochemical Properties of Sn-based Anode Materials for Lithium Ion Battery by Electrical Explosion Method
Hong, Seong-Hyeon ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 504~511
Nano-sized Sn powder was prepared by pulsed wire evaporation method. The Sn powder and carbon black were charged in jar and ball milled. The milling time was varied with 10 min., 1h, 2h, and 4h, respectively. The milled powders were dried and the shape and size were observed by FE-SEM. Nano-sized Sn powders were plastic-deformed and agglomerated by impact force of balls and heat generated during the SPEX milling. The agglomerated Sn powder also consisted of many nano-sized particles. Initial discharge capacities of milled Sn electrode powders with carbon powder were milled for 10 min., 1h, 2h, and 4h were 787, 829, 827, and 816 mAh/g, respectively. After 5 cycle, discharge capacities of Sn electrode powders with carbon powder milled for 10 min., 1h, 2h, and 4h decreased as 271, 331, 351, and 287 mAh/g, respectively. Because Sn electrode powders milled for 2h constist of uniform and fine size, the cyclability of coin cell made of this powders is better than others.
A Study of Design and Dynamic Characteristics of Compact Linear Engine for Porable Powerpack
Oh, Yong-Il ; Kim, Gang-Chul ; Lim, Ock-Taeck ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 512~519
Current rechargeable battery cannot provide high energy density and the operational durations required. But linear engine/generators provide high energy density for portable power applications because fuel is more high density. In this paper, we suggest that basic design of powerpack using linear engine for assisting power output. Efficiency is relatively high because linear engine don't have crank mechanism compared with rotary engine. We made prototype engine and had experiments to know moving characteristic about the Linear Engine. It was possible to operate velocity at 50 Hz at the firing and pressure in cylinder was 16bar.
The Evaluation of Fire Reliability for the High Pressure Hydrogen Storage System of Fuel Cell Vehicle (I)
Kim, Sang-Hyun ; Choi, Young-Min ; Hang, Ki-Ho ; Shim, Ji-Hyun ; Hang, In-Cheol ; Lim, Tae-Won ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 520~526
In recent years, it is very important that hydrogen storage system is safe for user in any circumstances in case of crash and fire. Because the hydrogen vehicle usually carry high pressurized cylinders, it is necessary to do safety design for fire. The Global Technical Regulation (GTR) has been enacted for localized and engulfing fire test. High pressure hydrogen storage system of fuel cell electrical vehicles are equipped with Thermal Pressure Relief Device (TPRD) installed in pressured tank cylinder to prevent the explosion of the tank during a fire. TPRDs are safety devices that perceive a fire and release gas in the pressure tank cylinder before it is exploded. In this paper, we observed the localized and engulfing behavior of tank safety, regarding the difference of size and types of the tanks in accordance with GTR.
Electrochemical Energy Storage of Milled Carbon Nanofiber
Lee, Hye-Min ; Jeon, Hyeon ; Choi, Weon-Kyung ; Cho, Tae-Hwan ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 527~533
CNFs had been well addressed due to numerous promising applications in science and technology. Besides the same physicochemical properties of ordinary carbon materials such as active carbons and carbon black, they exhibit specific, e.g., tubular or fibrous structures, a large surface area, high electrical conductivity stability, as well as extremely high mechanical strengh and modulus, which make them a superior material for electrochemical capacitors. In this study, CNFs were pretreated by mechanical milling with different time in mortar and pestle. The milled CNFs were used as active material of electrode whose electrochemical property was tested to find physicochemical characterization variation. CNF electrode milled for 5 min has the highest electric capacitance. XPS spectrum were employed to explore changes in functional group induced from mechanical milling. Crystal size was calculated to analyze change of peak from different milling time by XRD. The CNF milled for 5 min has the largest crystal size and the highest electric capacitance.
Study on the Combustion Reactivity of Residual Oil as a New Fuel for Power Generation
Park, Ho-Young ; Seo, Sang-Il ; Kim, Young-Joo ; Kim, Tae-Hyung ; Chung, Jae-Hwa ; Lee, Sung-Ho ; Ahn, Kwang-Ick ; Jeong, Young-Gap ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 534~545
This paper describes the evaluation of kinetic parameters for pyrolysis and carbon char oxidation of residual oil. The non-isothermal pyrolysis of residual oil was carried out with TGA (Thermo-Gravimetric Analyzer) at heating rate of 2, 5, 10 and
under N2 atmosphere. The first order and nth order pyrolysis models were used to fit the experimental data, and the nth order model was turned out to follow the experimental data more precisely than the first order model. For carbon char oxidation experiment, TGA and four heating rates used in pyrolysis experiment were also adapted. The kinetic parameters for the residual carbon char particle were obtained with three char oxidation model, that is, volume reaction, grain and random pore model. Among them, the random pore model described the char oxidation behaviour quite well, compared to other two models. The non-linear regression method was used to obtain kinetic parameters for both pyrolysis and carbon char oxidation of residual oil.
Dispersant Effect on Thermal Performance of SG
Lee, Jae-Keun ; Moon, Jeon-Soo ; Yoon, Seok-Won ; Maeng, Wan-Young ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 546~551
The corrosion on steam generator tubes of the secondary side of pressurized water reactor inhibits heat transfer. One of the most efficient techniques improving the heat transfer performance of a nuclear electric generation is a corrosion control. The environmental parameters mostly affecting corrosion are materials and chemical additives. It seems that no further corrosion occurs in steels with Polyacrylic acid polymer dispersant treatment. Polyacrylic acid forms a protective coating with uniform thickness on metal surface. Polyacrylic treatment appears to be the most convenient way to enhance the thermal performance by the thermal conductivity improvement in steam generators.
Design of a 50kW Class Rotating Body Type Highly Efficient Wave Energy Converter
Cho, Byung-Hak ; Yang, Dong-Soon ; Park, Shin-Yeol ; Choi, Kyung-Shik ; Park, Byung-Chul ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 552~558
A 50 kW class rotating body type wave energy converter consisted of two floating bodies and a PTO (Power Takeoff) unit is studied. As an wave energy extractor, the body is designed to have a VLCO (Variable Liquid-Column Oscillator) having a liquid filled U-tube with air chambers. Owing to the oscillation of the liquid in the U-tube caused by the air spring effect of the air chambers, the amplitude of response of the VLCO becomes significantly amplified for a target wave period. The PTO converts the rotational moment introduced from the relative motion of the hinged bodies to an hydraulic power by means of a cylinder. A high pressure accumulator, hydraulic motor and a generator are equipped in the PTO to convert the hydraulic power to electric power. A control law for adjusting the oscillation period of the VLCO is proposed for the efficient operation of the VLCO with various wave conditions. It is found that the effect of the air spring has an important role to play in making the oscillation of the VLCO match with the ocean wave. In this way, the wave energy converter equipped with the VLCO provides the most effective mode for extracting energy from the ocean wave.
Economic Evaluation of Domestic Low-Temperature Water Electrolysis Hydrogen Production
Gim, Bong-Jin ; Kim, Jong-Wook ; Ko, Hyun-Min ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 4, 2011, Pages 559~567
This paper deals with an economic evaluation of domestic low-temperature water electrolysis hydrogen production. We evaluate the economic feasibility of on-site hydrogen fueling stations with the hydrogen production capacity of 30
by the alkaline and the polymer electrolyte membrane water electrolysis. The hydrogen production prices of the alkaline water electrolysis, the polymer electrolyte membrane water electrolysis, and the steam methane reforming hydrogen fueling stations with the hydrogen production capacity of 30
were estimated as 18,403
, respectively. Domestic alkaline water electrolysis hydrogen production is evaluated as economical for small on-site hydrogen fueling stations, and we need to further study the economic evaluation of low-temperature water electrolysis hydrogen production for medium and large scale on-site hydrogen fueling stations.