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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 14, Issue 4 - 00 2003
Volume 14, Issue 3 - 00 2003
Volume 14, Issue 2 - 00 2003
Volume 14, Issue 1 - 00 2003
Selecting the target year
A Study on the Ultrasonic Application for the Efficiency Elevation of Hydrogen Fuel Production (On the Decrease of Overpotential by LSV)
Ju, Eunsun ; Park, Youngchul ; Song, Mingeun ; Son, Seungwoo ;
Transactions of the Korean hydrogen and new energy society, volume 14, issue 3, 2003, Pages 187~194
The production of hydrogen fuel depends basically on the water electrolysis. The study on the decrease of overpotential which activates the hydrogen production is the core to elevate the hydrogen production efficiency on principle. Characteristics on the overpotential decrease are observed through the micro reaction by ultrasonic in electrolytic cell. For the above, the electrochemical analyzer, i.e., BAS is applied, Experiments with ultrasonic forcing into 4 kinds of solution such as city water, city water plus nitrogen. distilled water, and distilled water plus nitrogen are carried out. And concentrations of KOH are 0%, 10%, 20% and 30%. The basic characteristics of the overpotential decrease are obtained through the analysis by LSV technique in sweep technique. In results, it is clarified that the ultrasonic influences the decrease of overpotential to obtain the efficiency elevation of hydrogen fuel production.
Transient Characteristics of Fuel Cell Stack at Continuous Current Discharge
Park, Chang Kwon ; Jeong, Kwi Seong ; Oh, Byeong Soo ;
Transactions of the Korean hydrogen and new energy society, volume 14, issue 3, 2003, Pages 195~206
Polymer electrolyte membrane fuel cells(PEMFC) are very interesting power source due to high power density, simple construction and operation at low temperature. But they have problems such as high cost, improvement of performance and effect of temperature. This problems can be approached using mathematical models which are useful tools for analysis and optimization of fuel cell performance and for heat and water management, in this paper, transient model consists of various energy terms associated with fuel cell operation using the mass and energy balance equation. And water transfer in the membrane is composed of back diffusion and electro-osmotic drag. The temperature calculated by transient model approximately agreed with the temperature measured by experiment in constant current condition.
Effect of Geometrical Shape and Cold Work on Deformation of the Hydrogen Absorption Metal with Hydrogen Absorption-Desorption Cycling
Jeong, Y.G. ;
Transactions of the Korean hydrogen and new energy society, volume 14, issue 3, 2003, Pages 207~216
By using the electrochemical method, the relation between the deformation and the geometrical shape, and the effect of cold work on hydrogen absorption-desorption cycling in palladium were investigated, In order to study this problem, four kinds of the Pd specimens used were plates and bars as cold worked and annealed states. As results, it is found that the deformation of thickness direction in the palladium plates increased whereas other lateral directions decreased. But the palladium bars showed the same deformation ratio in all directions because of uniform distribution of the
phase. Grains in the plate specimens were greatly deformed after hydrogenation cycling whereas grains in the bar specimens were pulverized. Also, deterioration of the hydrogen absorption rate of the bar specimen was larger than the plate specimen. And the effect of cold work on hydrogen absorption capacity was relatively small.
A Relation between the Electrochemical Behaviors and Morphology of Co
Composites as Anode Materials for Li Ion Secondary Batteries
Kang, Yong-Mook ; Lee, Yong-Ju ; Song, Min-Sang ; Park, Min-Sik ; Lee, Jai-Young ;
Transactions of the Korean hydrogen and new energy society, volume 14, issue 3, 2003, Pages 217~228
Operation of A Small MCFC Stack Using New Designed Circular Separator
Han, Jonghee ; Roh, Gil-Tae ; Yoon, Sung Pill ; Nam, Suk Woo ; LIm, Tae Hoon ; Hong, Seong Ahn ;
Transactions of the Korean hydrogen and new energy society, volume 14, issue 3, 2003, Pages 229~235
A 50W class MCFC stack was operated in order to test a new design of the circular shaped separator. in the new design, the anode gas was supplied into the stack and was exhausted out of the stack after the anode reaction. The exhausted gas was reacted with the cathode gas supplied with excess oxygen in the vessel in which the stack was placed. Then the reacted gas flowed into the cathode side of the stack and was exhausted through the outlet located in the center of the stack. The average voltage of the single cells in the stack was 0.835V under the current density of
, initially, and the degradation rate of the stack voltage was 1.7%/1,000h. High stack voltage with good stability of the present stack was due to the small temperature gradient in the stack. The small temperature gradient as well as the easiness of temperature control was the result of the new configuration of the separator which utilized the heat of the combustion reaction between anode outlet gas and the cathode inlet gas for heating the stack.
Modeling and Analysis of the Air Supply System for Vehicular PEM Fuel Cell
Jang, Hyuntak ; Kang, Esak ;
Transactions of the Korean hydrogen and new energy society, volume 14, issue 3, 2003, Pages 236~246
This paper focuses on developing a model of a PEM fuel cell stack and to integrate it with realistic model of the air supply system for fuel cell vehicle application. The fuel cell system model is realistically and accurately simulated air supply operation and its effect on the system power and efficiency using simulation tool Matlab/Simulink. The Peak performance found at a pressure ratio of 3, and it give a 15mV increase per cell. The limit imposed is a minimum SR(Stoichiometric Ratio) of 2 at low fuel cell load and 2.5 at high fuel cell load.
Synthesis of Carbon Nanotube and Optical Application
Joo, Young-Joon ; So, Won-Wook ; Kim, Heejoo ; Chol, Ho-Suk ; Moon, Sang-Jin ;
Transactions of the Korean hydrogen and new energy society, volume 14, issue 3, 2003, Pages 247~257
To investigate the effect of preparing condition on the physical properties of carbon nanotubes suitable for optical applications, carbon nanotubes were synthesized by thermal chemical vapor deposition using Ni particles as a catalyst on stainless steel substrate and acetylene as a reactant gas. To examine the physical and optical properties, SEM, TEM, Ram an, UV-visible, and photoluminescence spectroscopy were used. The physical properties of carbon nanotubes such as diameter, degree of growth density and morphology were closely related to such experimental conditions as Ni particle size, growing pressure, and etching condit on of Ni particles, it appeared from the light absorbance and photoluminescence spectra of carbon nanotube mixture prepared with an addition of a photopolymer, P3HT(Poly(3-hexylthIop hene)) that carbon nanotube could do a role as a kind of electron acceptor for solar cell application.
Study of Oxygen Carriers with Single Metal Oxides for Chemical-Looping Combustion
Lee, J.B. ; Park, J.S. ; Choi, S.I. ; Song, Y.W. ; Yang, Y.S. ; Kim, Y.H. ;
Transactions of the Korean hydrogen and new energy society, volume 14, issue 3, 2003, Pages 258~267
A new kind of oxygen carrier material is tested for chemical-looping combustion. NiO, CoO,
is chosen as metal oxide and YSZ as a binder. Hydrogen fuel is reacted with metal oxide (reduction of metal oxide) and then the reduced metal is successively oxidized by air. Dissolution method is examined to prepare the oxygen carriers. The effects of reaction temperature are measured by a TGA, mechanical strength and regenerability after 10 cycle are examined.
oxygen carrier is bested in mechanical strength and we consider that NiO/YSZ after 3rd cycle are good oxygen carrier in according to reactor design.
The Properties of the Several Metal Oxides in the Water-splitting for H
Son, Hyun-Myung ; Park, Chu-Sik ; Lee, Sang-Ho ; Hwang, Gab-Jin ; Kim, Jong-Won ; Lee, Jin-Bae ;
Transactions of the Korean hydrogen and new energy society, volume 14, issue 3, 2003, Pages 268~275
The water-splitting process by the metal oxides using solar heat is one of the hydrogen production method. The hydrogen production process using the metal oxides (NiFe2O4/NiAl2O4,CoFe2O4/CoAl2O4, CoMnNiFerrite, CoMnSnFerrite, CoMnZnFerrite, CoSnZnFerrite) was carried out by two steps. The first step was carried out by the CH4-reduction to increase activation of metal oxides at operation temperature. And then, it was carried out the water-splitting reaction using the water at operation temperature for the second step. Hydrogen was produced in this step. The production rates of H2 were 110, 160, 72, 29, 17,
for NiFe2O4/NiAl2O4, CoFe2O4/CoAl2O4, CoMnNiFerrite, CoMnSnFerrite, CoMnZnFerrite, CoSnZnFerrite respectively in the second step. CoFe2O4/CoAl2O4 had higher H2 production rate than the other metal oxides.
An Investigation of Combustion and EmissionCharacteristics in Heavy-Duty Hydrogen-CNG Engine
LIM, H.S. ; KIM, Y.Y. ; LEE, J.T. ;
Transactions of the Korean hydrogen and new energy society, volume 14, issue 3, 2003, Pages 276~282
A hydrogen enriched CNG engine can be stably operated at ultra lean condition and reduce emission extremely. It also has advantage to increase gradually the use of hydrogen for the coming hydrogen-energy age. In this studies, the combustion and emission characteristics of heavy-duty hydrogen-CNG engine were investigated to verify the enhancement of performance by enriched hydrogen into natural gas. The results showed that a hydrogen-CNG engine could achieve ultra lean operation and low emission, while power was reduced by the decrease of intake air flow.