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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 18, Issue 4 - Dec 2007
Volume 18, Issue 3 - Sep 2007
Volume 18, Issue 2 - Jun 2007
Volume 18, Issue 1 - Mar 2007
Selecting the target year
Thermophilic Hydrogen Production from Microbial Consortia Using PVDF Membrane Bioreactor
Oh, You-Kwan ; Lee, Dong-Yeol ; Kim, Mi-Sun ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 223~229
CdS-Titania-Nanotube Composite Films for Photocatalytic Hydrogen Production
Lee, Hyun-Mi ; So, Won-Wook ; Baeg, Jin-Ook ; Kong, Ki-Jeong ; Moon, Sang-Jin ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 230~237
Titania nanotube(TiNT) and CdS sol were synthesized by hydrothermal reaction under strongly basic condition and by precipitation reaction of
aqueous solutions, respectively. After preparing a series of CdS-TiNT composite films on
conducting glass with variation of the mole ratio (r) of TiNT/(CdS+TiNT), their visible light absorption, photocatalytic activities for hydrogen production, and the photocurrent generation were examined. In general, this CdS-TiNT series showed lower photocatalytic activities and photocurrent generation under Xe light irradiation compared to their counterparts, i.e., CdS-
particulate series. It appeared that TiNTs are not so effective photocatalyic material in spite of their larger specific surface areas compared to
nanoparticles, because they indicate a poor crystallinity and less intimate interaction or contact with CdS particles owing to the tubular morphology and an easy agglomeration among themselves.
Synthesis and Microstructure of Cu/VSZ Composite for High Temperature Electrolysis Cathode
Kim, Jong-Min ; Jung, Hang-Chul ; Kang, An-Soo ; Hong, Hyun-Seon ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 238~243
The composite powder of Cu and YSZ was synthesized for a high temperature electrolysis cathode by mechanical milling. The average Cu particle size was reduced to 5 micro-meter from 48 micro-meter after the mechanical ball milling. The composite powder showed that Cu particles were uniformly covered with finer YSZ particles. Sub-micron sized pores were uniformly dispersed in the Cu/YSZ composit. Homogeneously-dispersed fine YSZ in the composite is expected to the increase in triple phase boundaries, thereby leading the enhanced performance of cathode.
Study on Relation between
Evolution and Photoelectrical Properties of Photoanode
Bae, Sang-Hyun ; Kang, Joon-Won ; Shim, Eun-Jung ; Yoon, Jae-Kyung ; Joo, Hyun-Ku ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 244~249
The present work considers the concept of enzymatic photoelectrochemical generation of hydrogen through water splitting using a Xe lamp as a source of light. A solar cell was applied to the system in order to shift the level of electrochemical energy of the system, resulting in the rate of hydrogen production at
in cathodic compartment with an anodized tubular
/1hr in 0.5 wt% HF-
/5hr). The trend of the rate of hydrogen production, for the ATTEs with different annealing temperature from
, fairly well coincided with the photoelectrical properties measured by potentiostat. The actual chemical bias through imposition of two electrolytes of different pHs between anode(13.68) and cathode(7.5) was 0.24eV.
Improvement of Fe, Mn or Si Substitution on Hydrogen Storage Properties of Ti-Cr-V Alloys
Yoo, Jeong-Hyun ; Cho, Sung-Wook ; Park, Choong-Nyeon ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 250~255
Hydrogen storage properties of
, M=Fe, Mn, Si) have been investigated. With varing of Mn content, the lattice parameter of the alloy was unchanged and similar to that of
alloy. With increase of Fe, Si content, the lattice parameters of the BCC phases decreased. When the Fe content was 8 at%, the desorption plateau pressure increased to several atmospheres without decrease of the effective hydrogen storage capacity of the alloy. When the Mn content was 8 at%, the effective hydrogen storage capacity showed approximately 2.5 wt% without change in the desorption plateau pressure. With increase of Si content, hysteresis increased and hydrogen storage capacity decreased rapidly. A study was also made on how desorption temperature affected the usable hydrogen of the
alloy. The temperature was varied from 293 to 413 K, and the pressure from 5 to 0.002 MPa. The usable hydrogen of the alloy was 2.7 wt% when absorbed and desorbed at 293 K and 373 K., respectively. The heat of hydride formation of the alloy was approximately -35.5 kJ/mol
Numerical Study on Hydrogen Absorption and Expansion Behavior on Palladium
Kim, S.W. ; Hwang, C.M. ; Jang, T.I. ; Jung, Y.G. ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 256~264
In order to calculate the relation between the hydrogen and the hydrogen absorption metals in the atomic level, Embedded Atom Method(EAM) is recommended. In this study, we had constructed the EAM programs from constitutive formulas and parameters of the hydrogen and palladium for the purpose of predicting the expansion behavior on hydrogen absorbing in the geometric shape of hydrogen absorption metals, as palladium bars and plates. And the EAM analyses data were compared with the experiment data by using electrochemical method. As results, it is note that the expansion rate in thickness of the palladium plate model by EAM analyses is about 4 times larger than width and length, be similar to experiment results. Also, in the microscopic and macroscopic level the expansion behavior through EAM analyses show good agreement with experiment data.
A Study on NO Emission Behavior through Preferential Diffusion of
and H in
Laminar Diffusion Flames
Park, Jeong ; Kwon, Oh-Boong ; Yun, Jin-Han ; Keel, Sang-In ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 265~274
A study has been conducted to clarify NO emission behavior through preferential diffusion effects of
and H in methane-hydrogen diffusion flames. A comparison is made by employing three species diffusion models. Special concerns are focused on what is the deterministic role of the preferential diffusion effects in flame structure and NO emission. The behavior of maximum flame temperatures with three species diffusion models is not explained by scalar dissipation rate but the nature of chemical kinetics. The preferential diffusion of H into reaction zone suppresses the populations of the chain carrier radicals and then flame temperature while that of
produces the increase of flame temperature. These preferential diffusion effects of
and H are also discussed about NO emissions through the three species diffusion models.
The Evaporation Flow Patterns and Heat Transfers of R-22 and R-134a in Small Diameter Tubes
Son, Chang-Hyo ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 275~283
Influences of Various Electrolytes on the Low-Temperature Characteristics of Ni-MH Secondary Battery
Park, Chae-Gyu ; Shim, Jong-Su ; Jang, Min-Ho ; Park, Choong-Nyeon ; Choi, Jeon ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 284~291
The Ni-MH batteries for HEV and industry are normally placed in outdoor, consequently causing an too weak discharge power problem due to a cold weather specially in winter time. In order to improve the low temperature performances of the Ni-MH battery for HEV and industrial uses, it has been investigated the low temperature discharge characteristics of Ni-MH battery with various electrolytes at
. The summary of experimental results are as follows. The low temperature characteristics depended strongly on the characteristics of electrolytes. When the concentration of the electrolytes were too high or too low the low temperature performance was poor. The best electrolyte was composed of KOH 6.2M+LiOH 1.2M. An addition of RbOH or CsOH to electrolyte improved the low temperature performance. The best total concentration of electrolyte composed of KOH, NaOH and LiOH was about 7M.
Thermal Management of Proton Exchange Membrane Fuel Cell
Yu, Sang-Seok ; Kim, Han-Seok ; Lee, Sang-Min ; Lee, Young-Duk ; Ahn, Kook-Young ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 292~300
A dynamic system model of a proton exchange membrane fuel cell(PEMFC) has been developed. The PEMFC of this study has large active area with water cooling in order to simulate the performance of the commercially viable PEMFC system for the transportation. A PEMFC stack model is a transient thermal model which is respond to the dynamic change of the coolant temperature and the flow rate. The dynamic cooling system model has been developed to determine the coolant flow rate and the coolant temperature. Prior to the system level study, thermal management criteria have been set up and brought to the control command of the cooling system. Since the system model is designed to evaluate the effect of thermal management on the system performance, it is attempted to determine the proper control algorithm of the cooling system so that the PEMFC system is working on the thermal management criteria. As a result of simulation, feedback controlled cooling system consumes less power and produce more power comparing with that of conventionally controlled cooling system.
Physicochemical Study of Thermal Treated Serpentine for Carbon Dioxide Sequestration
Choi, Weon-Kyung ; Cho, Tae-Hwan ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 301~308
Silicate mineral serpentine with magnesium and calcium was selected as a mineral carbonation mediators for carbon dioxide storage. Serpentine has various metallic elements as an oxides form of magnesium, iron, calcium, aluminium etc. Magnesium and calcium could be carbonation salt preferentially than other metal component within serpentine. Systemic thermochemical treatment for serpentine could change physicochemical properties like a surface area and pore dimensions. Due to the rapid chemical reaction rate depended on dimensional values, carbonation formation could determined by surface property change of thermochemical treated serpentine.
Application of Combinatorial Catalysis Techniques for Hydrogen Generation Catalysts
Suh, Dong-Jin ; Wolf, Eduardo E. ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 309~316
Study on the Conversion of Ortho to Para Hydrogen
Kim, Jong-Pal ; Lee, Kwang-Hyun ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 317~324
The conversion reaction of ortho to para hydrogen was studied. The percentage of ortho and para hydrogen is mainly dependent on the equilibrium temperature. Because this reaction is known to be accelerated by the catalyst such as nickel-silicate and ruthenium on silica, we focused in the test and development of the catalysts. We studied metal-silicates because they provide high metal dispersion on support. Nickel-silicate, ruthenium-silicate and mixed-silicate were prepared by the coprecipitation method and used in the reaction at the temperature of liquid nitrogen. The conversion was measured by the difference of thermal conductivity between reference gas and sample gas. The activation condition was important and it affected the activities of the catalysts. Nickel-silicate showed high activities. Ruthenium-silicate also showed relative high activities but mixed-silicate showed poor activities.
Synthesis and Electrochemical Properties of
for the Development of Cathode Materials with Large Capacity
Song, Myoung-Youp ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 325~333
were synthesized with a combustion method by calcining in an
for 36 h. The X-ray diffraction patterns of these synthesized samples showed
structure of rhombohedral system(space group;
) with no evidence of impurities. Among these samples,
exhibited comparatively high first discharge capacity and discharge capacity, and the best cycling performance.
had the first discharge capacity of 165.2 mA h/g and a discharge capacity of 116.7 mA h/g at the 50th cycle at 0.1C rate. It showed the first discharge capacity of 141.0 mA h/g and a discharge capacity of 93.5 mA h/g at the 50th cycle at 0.5C rate.
Hydrogen Absorption Kinetics on Al/Pd Film in the
Cho, Young-Sin ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 334~341
Al film(135.5 nm thick) with Pd film(39.6 nm thick) was made by thermal evaporation method. Electrical resistance change by hydrogen absorption and desorption was measured with four point measurement method. Even though Al film(135.5 nm thick) did not absorb any hydrogen at room temperature, Al/Pd film absorbed hydrogen at upto 640 torr pressure. Hydrogen absorption kinetics was monitored by measuring resistance change of the sample in the temperature range from
. Absorption activation energy of Al/Pd film was about 10.7 and 17.7 kcal/mol H for 1st stage and last stage respectively at 1 torr hydrogen pressure. This activation values are bigger than that of Pd film, but are much less than that of Al film. This result indicates there is possibility that Al can be storage material for hydrogen by using Pd film evaporation on it.
Experimental and Numerical Study on the Hydrogen Refueling Process
Lee, Taeck-Hong ; Kim, Myoung-Jin ; Park, Jong-Kee ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 342~347
The research on production and application of hydrogen as an alternative energy in the future is being carried out actively. It hydrogen storage is necessary in order that user use hydrogen economically without much difficulty. Among the ways of hydrogen storage the method which is compressed hydrogen gas by high pressure is easier for application than other methods. In this study, we have been calculated gas with changing pressure and temperature variation of container wall through applied to mass and energy balance equation when compressing hydrogen by high pressure, and also to Beattie-Bridgeman equation of state for the kinetic of hydrogen. We will apply above date as a preliminary for design of hydrogen storage tank.
A Investigation of Back Fire Control with Valve Overlap Period Change In the Same Supply Energy
Kang, J.K. ; Huynh, Thanh Cong ; Noh, K.C. ; Lee, J.T. ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 3, 2007, Pages 348~355
To grasp a feasibility of back fire control by valve overlap period, back fire limit equivalence ratio was estimated with valve overlap period which has the same supply energy and positive intake pressure as valve overlap period
. As the result, it was shown that the smaller valve overlap period has the higher back fire limit equivalence ratio under valve overlap period
as well as VOP
. This result means that expansion of back fire equivalence ratio by decreasing valve overlap period was caused by decrease of back flow duration of flame from in-cylinder to intake port than decrease of lower supply energy.