Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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
Numerical Analysis on Performance Changes of the Tubular SOFCs according to Current Collecting Method
Yu, Geon ; Park, Seok-Joo ; Lee, Jong-Won ; Lee, Seung-Bok ; Lim, Tak-Hyoung ; Song, Rak-Hyun ; Shin, Dong-Ryul ; Kim, Ho-Young ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 129~138
Performance changes of an anode-supported tubular SOFC including current collectors are analyzed at different current collecting methods using numerical simulation. From the two dimensional numerical model of the solid oxide fuel cell with nickel felts as anodic current collectors and silver wires as cathodic ones, the performance curves and the distributions of temperature, concentration, current density are obtained. Also, the voltage loss of the cell is divided into three parts: activation loss, concentration loss and ohmic loss. The results show that the performance change of the cell is dominantly influenced by the ohmic loss. Although the temperature and concentration distributions are different, the total activation loss and concentration loss are nearly same. And the ohmic loss is divided into each parts of the cell components. The ohmic loss of the anodic current collectorreaches about 60~80% of the cell's total ohmic loss. Therefore, the reduction of the ohmic loss of the anodic current collector is very important for stack power enhancement. It is also recommended that the load should be connected to the both ends of the anodic current collector.
Bench-scale Test of Sulfuric Acid Decomposition Process in SI Thermochemical Cycle at Ambient Pressure
Jeon, Dong-Keun ; Lee, Ki-Yong ; Kim, Hong-Gon ; Kim, Chang-Soo ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 139~151
The sulfur-iodine (SI) thermochemical water splitting cycle is one of promising hydrogen production methods from water using high-temperature heat generated from a high temperature gas-cooled nuclear reactor (HTGR). The SI cycle consists of three main units, such as Bunsen reaction, HI decomposition, and
decomposition. The feasibility of continuous operation of a series of subunits for
decomposition was investigated with a bench-scale facility working at ambient pressure. It showed stable and reproducible
decomposition by steadily producing
corresponding to a capacity of 1 mol/h
for 24 hrs.
Numerical Analysis of Electromagnetic Radiation Characteristics by High Voltage and General Cables for Fuel Cell Electric Vehicle (FCEV)
Lee, Soon-Yong ; Seo, Won-Bum ; Lim, Ji-Seon ; Choi, Jae-Hoon ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 152~160
The electromagnetic characteristics of FCEVs (fuel cell electric vehicles) are much different from the existing combustion engine cars as well as hybrid, plug-in-hybrid, and pure electric vehicles due to the high voltage/current generated by a fuel cell stack which uses a compressed hydrogen gas reacted with oxygen. To operate fuel cell stack efficiently, BOP (Balance of Plant) which is consisted of many motors in water pump, air blower, and hydrogen recycling pump as well as inverters for these motors is essential. Furthermore, there are also electric systems for entertainment, information, and vehicle control such as navigation, broadcasting, vehicle dynamic control systems, and so on. Since these systems are connected by high voltage or general cables, EMC (Electromagnetic compatibility) analysis for high voltage and general cable of FCEV is the most important element to prevent the possible electric functional safety errors. In this paper, electromagnetic fields by high voltage and general cables for FCEVs is studied. From numerical analysis results, total time harmonic electromagnetic field strength from high voltage and general cables have difference of 13~16 dB due to ground effect by impedance matching. The EMI results of FECV at 10 m distance shows difference of 41 dB at 30 MHz and 54 dB at 230 MHz compared with only general cable routing.
Hydrogen Permeation of SrCe
Proton-Conducting Ceramic Membranes
Kim, Hwan-Soo ; Yu, Ji-Haeng ; Shin, Min-Jae ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 161~167
Proton conductors have attracted considerable attention for solid oxide fuel cell (SOFC), hydrogen pump, gas sensor, and membrane separators. Doped
exhibits appreciable proton conductivity in hydrogen-containing atmosphere at high temperature. However commercial realization has been hampered due to the reactivity of
. The chemical stability and proton conductivity are dependent on dopant type. The purpose of this work is to investigate chemical stability of
gases. Thermogravimetric analysis (TGA) was performed in gaseous
and electrical conductivity of the composites were also measured between 500 and
in air and
composite membranes showed good chemical stability of in
atmosphere and high conductivity at hydrogen condition. The hydrogen permeation of
composite membranes was investigated as a function of volumetric content of
(6:4) membrane with a thickness of 1.0 mm showed the highest hydrogen permeability with the flux reaching of 0.12
as feed gas.
Kinetics Study on the Reduction with Methane, Oxidation with Water and Oxidation with Air of Fe
Nam, Hyun-Woo ; Kang, Kyoung-Soo ; Bae, Ki-Kwang ; Kim, Chang-Hee ; Cho, Won-Chul ; Kim, Young-Ho ; Park, Chu-Sik ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 168~177
A set of kinetics study on the reduction with
, oxidation with steam and oxidation with air was performed for
was prepared by aerial oxidation method. The reactivity experiments were performed in a thermogravimetric analyzer (TGA) with different reacting gas concentrations and temperatures. The obtained activation energy of reduction by methane, oxidation by water and oxidation by air are 219 kJ/mol, 238 and 20 respectively.
Development of a Thermal Model for Discharge Behavior of MH Hydrogen Storage Vessels
O, Sang-Kun ; Cho, Sung-Wook ; Yi, Kyung-Woo ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 178~183
Metal hydride alloys are a promising type of material in hydrogen storage applications, allowing for low-pressure, high-density storage. However, while many studies are being performed on enhancing the hydrogen storage properties of such alloys, there has been little research on large-scale storage vessels which make use of the alloys. In particular, large-scale, high-density storage devices must make allowances for the inevitable generation or absorption of heat during use, which may negatively impact functioning properties of the alloys. In this study, we develop a numerical model of the discharge properties of a high-density MH hydrogen storage device. Discharge behavior for a pilot system is observed in terms of temperature and hydrogen flow rates. These results are then used to build a numerical model and verify its calculated predictions. The proposed model may be applied to scaled-up applications of the device, as well as for analyses to enhance future device designs.
Study on Anion Exchange Membrane for the Alkaline Electrolysis
Choi, Ho-Sang ; Rhyu, Chul-Hwe ; Lee, Sung-Un ; Byun, Chang-Sub ; Hwang, Gab-Jin ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 184~190
The membrane properties (membrane resistance and ion exchange capacity) of the five types of commercial anion exchange membrane, i.e. IOMAC, AHT, APS, AHA, AFN, were evaluated for the application in the alkaline electrolysis. The membrane resistance decreased in the order; in 1M KOH: AHT>IOMAC>AHA>AFN>APS; in 1M NaOH: AHT>IOMAC>AHA>APS>AFN. The ion exchange capacity decreased in the order: AFN>APS>AHT>AHA>IOMAC. The membrane life was determined from the change of membrane resistance in 1M KOH and NaOH with an increase of soaking time in 20 wt% KOH and 30 wt% NaOH solution. AHA membrane had a good membrane life in 20 wt% NaOH with its unchanged membrane resistance. And, AFN and AHA membrane had a good membrane life in 30 wt% NaOH with its unchanged membrane resistance.
The Performance Evaluation of Plate Type STR Reactor with Variation of S/C Ratio and Fuel Supply
Kim, Hun-Ju ; Heo, Su-Bin ; Park, Jae-Min ; Yoon, Bong-Seok ; Lee, Do-Hyung ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 191~198
According to the propagation of fuel cell system, the importance of that system efficiency is being magnified. Thus, the efficiency improvement of reformer which is the important factor of fuel cell system will be required. This study has been experimentally performed to evaluated the performance of plate type STR reactor. At first, we changed fuel flow rate (2, 3 and 4 l/min) in burner, and then we measured a proportion of hydrogen in produced gas through the STR reactor by G.C for evaluating the performance of plate type STR reactor in various fuel supply conditions. And we changed S/C ratio (2 and 4) and measured a proportion of hydrogen in produced gas through the STR reactor. As a results, condition at fuel flow rate 2 and 3 l/min could not be supplied amount of heat for STR sufficiently. Condition at fuel flow rate 4 l/min could supplied a heat excessively. And condition at S/C ratio 2, reaction occurred insufficiency. But condition at S/C ratio 4 was excess. From above, we found the optimum conditions that were fuel rate 3.5 l/min and S/C ratio 3.
Surface Coating and Corrosion Characteristics of Bipolar Plates of PEMFC Application
Kang, Kyung-Min ; Kim, Dong-Mook ; Choi, Jeong-Sik ; Cha, In-Soo ; Yun, Young-Hoon ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 199~205
Stainless steel 304 and 316 plates were deposited with the multi-layered coatings of titanium film (0.1 um) and gold film (1-2 um) by an electron beam evaporation method. The XRD patterns of the stainless steel plates modified with the multi-layered coatings showed the crystalline phases of the external gold film and the stainless steel substrate. Surface microstructural morphologies of the stainless steel bipolar plates modified with multi-layered coatings were observed by AFM and FE-SEM images. The external gold films formed on the stainless steel plates showed micro structure of grains of about 100 nm diameter. The grain size of the external surface of the stainless steel plates increased with the gold film thickness. The electrical resistance and water contact angle of the stainless steel bipolar plates covered with multi-layered coatings were examined with the thickness of the external gold film.
Study on Process Parameters for Effective H
Production from H
O in High Frequency Inductively Coupled Plasma Reactor
Kwon, Sung-Ku ; Jung, Yong-Ho ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 206~212
The effect of process parameters on
production from water vapor excited by HF ICP has been qualitatively examined for the first time. With the increase of ICP power, characteristics of
dissociation in plasma was divided into 3 regions according to both reaction mechanism and energy efficiency. At the edge of region (II) in the range of middle ICP power, energy effective hydrogen production from
plasma can be achieved. Furthermore, within the region (II) power condition, heating of substrate up to
shows additional increase of 70~80% in
production compared to
plasma without substrate heating. This study have shown that combination of optimal plasma power (region II) and wall heating (around
) is one of effective ways for
Reaction Characteristics of Coal and Oxygen Carrier Particle in a Thermogravimetric Analyzer
Ryu, Ho-Jung ; Kim, Young-Joo ; Park, Yeong-Seong ; Park, Moon-Hee ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 213~222
To check adaptability of low ash coal(hyper coal) to chemical looping combustion, reaction characteristics of two coals (Roto and Hyper coal) with two oxygen carriers (NiO/bentonite, OCN703-1100) have been investigated in a thermogravimetric analyzer. Hyper coal represented low combustion rate and high ignition temperature, high volatile content and high devolatilization rate, and therefore, showed worse oxygen transfer during successive 10 cycle reduction-oxidation test than Roto coal. Finally we selected Roto coal as the candidate coal for chemical looping combustion. For Roto coal, OCN703-1100 particle showed better oxygen transfer than NiO/bentonite particle. During 10 cycle reduction oxidation test, change of the extent of oxidation (Wo) was negligible and we could conclude that both oxygen carriers have sufficient regeneration ability.
Study of Working Fluids on Thermodynamic Performance of Organic Rankine Cycle (ORC)
Kim, Kyoung-Hoon ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 223~231
The thermal efficiency of energy-to-power conversion becomes uneconomically low when the temperature of heat source drops below
. ORC (Organic Rankine Cycle) has attracted much attention in last few years due to its potential in reducing consumption of fossil fuels and relaxing environmental problems, and its favorable characteristics to exploit low-temperature heat sources. In this work thermodynamic performance of ORC using nine working fluids is comparatively assessed. Special attention is paid to the effect of system parameters such as turbine inlet temperature and pressure on the characteristics of the system such as volumetric flow rate and quality at turbine exit, latent heat, net work as well as thermal efficiency. Results show that in selection of working fluid it is required to consider various criteria of performance characteristics as well as the thermal efficiency. Results also show that the system efficiencies become same irrespective of kind of working fluid when the temperature of heat source decreases to low range.
The Study on DME (dimethyl ether) Conversion Over the Supported SAPO-34 Catalyst
Lee, Su-Gyung ; Yoo, Byoung-Kwan ; Je, Han-Sol ; Ryu, Tae-Gong ; Park, Chu-Sik ; Kim, Young-Ho ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 232~239
DME has received much attention because of its possible use as a fuel and a chemical feedstock. Chemical conversion of DME to olefin (DTO) over various SAPO-34 catalysts was carried out using a fixed bed reactor. Main products of the reaction were light olefins such as ethylene, propylene and butenes. The best reaction conditions for high life time of the catalyst and high selectivity of light olefins were a reaction temperature of
and a WHSV of
. In addition, it was found that the deactivation of a SAPO-34 catalyst can be significantly suppressed by the addition of
as a supporter.
Study on Current Collector for All Vanadium Redox Flow Battery
Choi, Ho-Sang ; Hwang, Gab-Jin ; Kim, Jae-Chul ; Ryu, Cheol-Hwi ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 240~248
All-vanadium redox flow battery (VRFB) has been studied actively as one of the most promising electrochemical energy storage systems for a wide range of applications such as electric vehicles, photovoltaic arrays, and excess power generated by electric power plants at night time. Among consisting elements of the VRFB, the ion exchange membrane and the electrode play important roles. In this study, carbon PVC coposite sheets for the VRFB have been developed and electrochemical characteristics investigated. Current collector for VRFB, carbon PVC composite sheets (CPCS), were prepared with G-1028 as a conducting particle, PVC as a polymer, Dibutyl phthalate (DBP) as a plasticizer and fumed Silica (FS) as a dispersion agent. CPCS has been shown to have the characteristics as an excellent current collector for VRFB and electrochemical properties of specific resistivity 0.31
, which were composed of G-1028 80 wt%, PVC 10 wt%, DBP 5 wt% and FS 5 wt%.
Reactivity Test of Ni-based Catalysts Prepared by Various Preparation Methods for Production of Synthetic Nature Gas
Jang, Seon-Ki ; Park, No-Kuk ; Lee, Tae-Jin ; Koh, Dong-Jun ; Lim, Hyo-Jun ; Byun, Chang-Dae ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 249~256
In this study, the Ni-based catalysts for the production of synthetic natural gas were prepared by various preparation methods such as the co-precipitation, precipitation, impregnation and physical mixing methods. The ranges of the reaction conditions were the temperatures of 250~
/CO mole ratio of 3.0, the pressures of 1 atm and the space velocity of 20000
. It was found that the catalyst prepared by precipitation method had higher CO conversion than the catalyst prepared by co-precipitation method. While the catalyst prepared by precipitation method had the formation of NiO structure, the catalyst prepared by co-precipitation method had the formation of
structure. It was confirmed that Ni-based catalyst prepared by the physical mixing method had the lowest CO conversion because it was deactivated by the production of
during the methanation. As a result, it was shown clearly that Ni-based catalysts prepared by impregnation method expressed the highest catalytic activity in CO methanation.
A Study on Characteristic of the Bio-ethanol Produced on Fruit Wastes for Direct Ethanol Fuel Cell (DEFC)
Lee, Nam-Jin ; Kim, Hyun-Soo ; Cha, In-Su ; Choi, Jeong-Sik ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 257~264
This study discribes performance of DEFC (Direct Ethanol Fuel Cell) utilized bio-ethanol based on fruit wastes. To produce the bio-ethanol, fruit wastes were treated at temperature
and 90minutes in acid pre-treatment. After pre-treatment was done, alcohol fermentation process was running. Initial alcohol concentration was 5%. Using the multi coloumn distillation system, more than 95% ethanol was distilled and each component of bio-ethanol was analyzed. In DEFC performance test, it was revealed that cell performance was much higher than that of ethanol. Comparing ethanol with mixed fuel (bio-ethanol (10%) + ethanol (90%)), the performance of ethanol was higher than that of mixed fuel. Even though the bio-ethanol from the fruit wastes is corresponded with transport ethanol standards, it thought that organic matter in bio-ethanol could be negative effect on fuel cell.
Effect of Change of Hydrocarbon Reductant on HC-SCR over Fe/ZSM5 Catalyst
Kim, Seong-Soo ; Kim, Dae-Young ; Oh, Se-Yong ; Yoo, Seong-Jeon ; Park, Jeong-Hwan ; Kim, Jin-Gul ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 265~273
HC-SCR was conducted using Fe/ZSM5 catalyst coated over 200 cpi cordierite in the conditions of atomspheric pressure and
. Among the tested hydrocarbon reductants, isobutane (i-
) showed the highest de-
yield of 69% at
with the mole ratio of reductant/
yield resulted by the change of alkane reductant was increased as the carbon number of alkane reductant was increased. The order of increase of de-
yield was proportional to the order of decrease of bonding energy between C and H of reductant, where the H abstraction step from alkane molecule could be the rate controlling step of HC-SCR.
Strategic Niche Management for Enhancing Feasibility of the Hydrogen Economy
Park, Sang-Ook ;
Transactions of the Korean hydrogen and new energy society, volume 22, issue 2, 2011, Pages 274~282
This paper overviews the concept of the strategic niche management, which emphasises the social aspects of new technologies and calls for relevant government policies for socio-technical transition. Hydrogen energy technologies remain in the niche level, thus the SNM perspective is appropriate to be applied. The reason why, and the way how to see hydrogen as a socio-technical niche are discussed, followed by an analytic argument on hydrogen policies and their SNM characteristics. Final part of the paper deals the design of the socio-technical experiment. It is expected that this paper would contribute to not only policy development but also improving understandings on the socio-technical nature of hydrogen energy of hydrogen community.