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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 19, Issue 6 - Dec 2008
Volume 19, Issue 5 - Oct 2008
Volume 19, Issue 4 - Aug 2008
Volume 19, Issue 3 - Jun 2008
Volume 19, Issue 2 - Apr 2008
Volume 19, Issue 1 - Feb 2008
Selecting the target year
Degradation of Membrane With Pinholes in PEMFC
Kim, Tae-Hee ; Lee, Ho ; Lim, Tae-Won ; Park, Kwon-Pil ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 2, 2008, Pages 103~110
The most failure mode of PEM fuel cell is gas crossover caused by pinhole formation in MEAs. The degradation phenomena of MEA with pinholes were evaluated in various accelerated operation condition, such as OCV, low humidity and high partial pressure of oxygen. The performances of MEA with pinholes were almost same before and after normal 144 hours operation(
). The results of accelerated operation showed that OCV and low humidity condition more deteriorated MEA than gas crossover owing to pinholes. When oxygen was used as cathode gas, the pinholes of MEA were enlarged due to heat of combustion reaction on Pt catalyst of electrodes. This combustion reaction occurred at pinholes near gas inlet and resulted in local MEA failure.
The Comparison of Bunsen Reaction With Phase Separation in Sulfur-lodine Thermochemical Hydrogen Production Process
Lee, Kwang-Jin ; Ahn, Sueng-Hyuk ; Kim, Young-Ho ; Park, Chu-Sik ; Bae, Ki-Kwang ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 2, 2008, Pages 111~117
A Bunsen reaction section is a primary stage of Sulfur-iodine thermochemical hydrogen production cycle. This section is important, because it decides the efficiency of next stages. In order to produce hydrogen very efficiently, the characteristics of Bunsen reaction were investigated via two experimental methods. The one is a phase separation of
mixture system, and the other is a direct Bunsen reaction. The characteristics of each method were investigated and compared. As the result of this study, the amount of HI and
phase via Bunsen reaction was more decreased than that via
mixture system with increasing
concentration. However, the amount of
phase via Bunsen reaction was remarkably increased with increasing
concentration, while that via
mixture system was decreased. On the other hand, the range of initial composition which is able to separate into two liquid phases without
solidification was almost alike.
Development of the Hydrogen Recirculation System for Fuel Cell Hybrid Vehicle
Kim, Min-Jin ; Sohn, Young-Jun ; Kim, Kyoung-Youn ; Lee, Won-Yong ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 2, 2008, Pages 118~123
For the hydrogen recirculation system of the PEMFC (polymer electrolyte membrane fuel cell), the ejector is useful to improve the efficiency of the fuel cell system. However, conventional ejector does not keep its entrainment ratio good when the various power duties is required by the fuel cell system. In this study, the variable multi-ejector acceptable in the whole duty range required from the fuel cell hybrid mini-bus is developed. Consequently, the performance of the developed ejector is verified by the experiments based on the real operating conditions.
Purification of Hydrogenases from Purple Sulfur Bacterium Thiocapsa roseopersicina Using Various Applications of Chromatography
Choi, Eun-Hye ; Oh, You-Kwan ; Kim, Mi-Sun ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 2, 2008, Pages 124~131
Crude cytoplasmic fraction of phototrophic purple sulfur bacterium, Thiocapsa roseopersicina NCIB 8347, were initially prepared and purified by sonication, ultracentrifugation, ammonium sulfate fractionation and heat-treatment and it has been previously reported. Using various applications of chromatography far the purification of membrane-bound and soluble hydrogenases from heat-treated enzyme fraction were studied at present report. When the heat-treated enzyme preparation was applied to the anion column chromatography using Q-sepharose, Fraction I and II, which were extracted with the KCl 0-0.5 M gradient, showed the specific evolution hydrogenase activity 3.86 and 2.27 U/mg-protein respectively. Specific hydrogenase activitys of Fraction I and II were further increased to 4.35 and 7.46 U/mg-protein for Fraction I and to 2.49 and 4.41 U/mg-protein fur Fraction II respectively, when hydrophobic interaction column, Phenyl superose, and anion exchange column, Mono-Q, were applied. Size exclusion chromatography using superdex 200 concentrated the hydrogenase Fraction I and II to 9.19 and 7.84 U/mg-protein respectively at the final step of purification.
Thermo-chemical Cycle with
for Water-Splitting to Produce Hydrogen
Han, Sang-Bum ; Kang, Tae-Bum ; Joo, Oh-Shim ; Jung, Kwang-Deog ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 2, 2008, Pages 132~138
A Flow Analysis for Improvement of the Loop Scavenging Performance of a Free Piston Linear Power System
Yoon, Jae-Seong ; Cho, Hyoung-Wook ; Lee, Jong-Tai ; Lee, Yong-Gyun ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 2, 2008, Pages 139~144
The focus of this research is that the scavenging aspect of in-cylinder is visualized by the PIV method and its characteristic is analyzed so that the scavenging performance of the free piston hydrogen fueled engine can improve with loop scavenging. As the results, the piston of convex type shows the best scavenging performance among the presented pistons. In case of the abnormal expansion, the scavenging of area between cylinder head and cylinder wall doesn't operate well.
Economic Evaluation of Hydrogen Production by Fermentation
Gim, Bong-Jin ; Kim, Jong-Wook ; Park, Sang-Yong ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 2, 2008, Pages 145~155
This paper deals with an economic evaluation of hydrogen production by fermentation. We evaluate the economic feasibility of domestic hydrogen production by fermentation utilizing glucose and waste water sludge in terms of hydrogen production prices. In addition, we make some sensitivity analysis of hydrogen prices by changing the values of input factors such as the price of glucose, the capital cost of the hydrogen production system, and the hydrogen production yields. The estimated hydrogen prices of the two-step dark-light hydrogen production by fermentation utilizing glucose was
, and the single-step hydrogen production by anaerobic fermentation utilizing waste water sludge was
, respectively. It is expected that the hydrogen production price by anaerobic fermentation can be reduced if we produce methane or hydrogen utilizing by-products such as alcohols and organic acids, or the government imposes some legal regulations on the treatment of waste water sludge.
The Condensation Pressure Drop of R-22 and R-410A in Small Diameter Tube
Son, Chang-Hyo ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 2, 2008, Pages 156~162
The condensation pressure drop for R-22 and R-410A flowing in a small diameter tube was investigated. The test section is a counterflow heat exchanger with refrigerant flowing in the inner tube and coolant flowing in the annulus. The test section consists of 1220 mm length with horizontal copper tube of 3.38 mm outer diameter and 1.77 mm inner diameter. The refrigerant mass fluxes ranged from 450 to
and the average inlet and outlet qualities were 0.05 and 0.95, respectively. The main experimental results were summarized as follows : In the case of two-phase flow, the pressure drop increases with increasing mass flux and decreasing quality. The pressure drop of R-22 is slightly higher than that of R-410A for the same mass flux. Most of correlations proposed in the large diameter tube showed enormous deviations with experimental data.
Characterization of Carbon Nanofiber Electrode with different Ketjenblack Conducting Material Mixing Amount Using EDLC
Choi, Weon-Kyung ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 2, 2008, Pages 163~170
Carbon nanofibers with nano-sized structures were evaluated as a active material using supercacitor electrode which could store electrochemical energy reversibly. A feasibility of EDLC electrode was estimated with specific surface area measurement by BET method and mesopore structure of carbon nanofiber surface could be explained electrochemical absorption-desorption in aqueous electrolyte. A capacitance of carbon nanofiber electrode was increased gradually, depending on the ratio of Ketjenblack as a conducting material. Ketjen Black
ratio in electrode was observed a suitable amount of conducting material by cyclic voltametry results.
Technology Trend for Gas Hydrate Production Method by the Patent Analysis
Kang, Seong-Pil ; Seo, Yu-Teak ; Keum, Young-Sup ; Ahn, Myung-Hee ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 2, 2008, Pages 171~181
There are several methods for the gas hydrate production such as spraying water with countercurrent gas flow, stirring water-gas mixture, and flowing water with micro-bubble, etc. These days it has been widely studied for the gas hydrate production method, having low energy consumption and high efficiency. In this paper, patents in the gas hydrate production method were gathered and analyzed. The search range was limited to the open patents of USA, European Union (EP), Japan (JP), and Korea (KR) from 1991 to 2007. Patents were gathered by using keywords searching and filtered by crucial criteria. The trends of the patents were analyzed by the years, countries, companies, and technologies.