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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 20, Issue 6 - Dec 2009
Volume 20, Issue 5 - Oct 2009
Volume 20, Issue 4 - Aug 2009
Volume 20, Issue 3 - Jun 2009
Volume 20, Issue 2 - Apr 2009
Volume 20, Issue 1 - Feb 2009
Selecting the target year
The Effect of Mixing Region in Mixed Multiple Serpentine Flow-field to PEMFC Performance
Lee, Ji-Hong ; Lee, Myeong-Yong ; Kim, Hun-Ju ; Lee, Sang-Seok ; Lee, Do-Hyung ;
Transactions of the Korean hydrogen and new energy society, volume 20, issue 4, 2009, Pages 265~273
An Experimental Study on the Diaphragm Deflection Characteristic of a Hydrogen Diaphragm Compressor
Shin, Young-Il ; Park, Hyun-Woo ; Lee, Young-Jun ; Kim, Gyu-Bo ; Song, Ju-Hun ; Chang, Young-June ; Jeon, Chung-Hwan ;
Transactions of the Korean hydrogen and new energy society, volume 20, issue 4, 2009, Pages 274~282
Diaphragm compressor is widely used for hydrogen compression because it achieves high gas pressure without gas contamination. Diaphragm deflecting in the cavity with high pressure formed by an oil compression is the most important component in the compressor. Therefore, it is necessary to obtain deflection degree of diaphragm to predict the damage point of diaphragm. The objective of this study is to estimate the diaphragm's damage point through diaphragm deflection test by implementing with strain gauges attached on several radial points. Without gas compression, strain sum of each points varied as similarly as the variation of the pressure with respect to time. And while the motor speed was slower than 400rpm, the strain near the rim was larger than that of the center. When motor speed, however, was over 500rpm, strain became similar to that of the center and the rim. With gas compression, it was shown that the variation of the strain sum was delayed against that of the pressure and the strain near the rim was much higher than that of the center.
Performance Analysis of Polymer Electrolyte Membrane Fuel Cell by AC Impedance Measurement
Seo, Sang-Hern ; Lee, Chang-Sik ;
Transactions of the Korean hydrogen and new energy society, volume 20, issue 4, 2009, Pages 283~290
This study focuses on the performance characteristics of polymer electrolyte membrane fuel cell (PEMFC) using the AC impedance technique. The experiment was carried out to investigate the optimal operating conditions of PEMFC such as cell temperature, flow rate, humidified temperature and back-pressure. The fuel cell performance was analyzed by DC electronic-loader with constant voltage mode and expressed by voltage-current density. Additionally, AC impedance was measured to analysis of ohmic and activation loss and expressed by Nyquist plot. The results showed that the cell performance increased with increase of cell temperature, air flow rate, humidified temperature and backpressure. Also, the activation loss decreased as the increase of cell temperature, air flow rate, humidified temperature and backpressure.
Preparation of Ni-PTFE Electrode using Nickel Plating for Alkaline Fuel Cell
Kim, Jae-Ho ; Lee, Young-Seak ;
Transactions of the Korean hydrogen and new energy society, volume 20, issue 4, 2009, Pages 291~299
Ni-plated polytetrafluoroethylene(Ni-PTFE) particles(
) were prepared by using nickel electroless plating. The Ni content in Ni-PTFE particles increased with increasing the amount of reduction agent. At about 53 wt% Ni content,
Ni-PTFE particles showed conductivity of 320S/m. The Ni-PTFE particles were formed into the Ni-PTFE plate using heat treatment at
. The Ni-PTFE plate displayed the high conductivity of 5100S/m due to the formation of 3-dimentional Ni network. The plate was used as an electrode in an alkaline fuel cell(AFC). In terms of the current density, the Ni-PTFE electrode having higher Ni content(53 wt%) showed improved performance.
Planar, Air-breathing PEMFC Systems Using Sodium Borohydride
Kim, Jin-Ho ; Hwang, Kwang-Taek ;
Transactions of the Korean hydrogen and new energy society, volume 20, issue 4, 2009, Pages 300~308
In a pursuit of the development of alternative mobile power sources with a high energy density, a planar and air-breathing PEMFCs with a new type of hydrogen cartridge which uses onsite
generated from sodium borohydride (
) hydrolysis have been investigated for use in advanced power systems. Two types of
hydrolysis are available: (1) using organic acids such as sulphuric acid, malic acid, and sodium hydrogen carbonate in aqueous solution with solid
and (2) using solid selected catalysts such as Pt, Ru, CoB into the stabilized alkaline
solution. It might therefore be relevant at this stage to evaluate the relative competitiveness of the two methods mentioned above. The effects of flow rate of stabilized
solution, MEA (Membrane Electrode Assembly) improvement, and type and flow control of the catalytic acidic solution have been studied and the cell performances of the planar, air-breathing PEMFCs using
has been measured from aspects of power density, fuel efficiency, energy density, and fast response of cell. In our experiments, planar, air-breathing PEMFCs using
achieved to maximum power density of 128mW/
at 0.7V and energy efficiency of 46% and has many advantages such as low operating temperature, sustained operation at a high power density, compactness, the potential for low cost and volume, long stack life, fast star-up and suitability for discontinuous operation.
Investigation of Gas Diffusion Layer Effects on the Freeze/Thaw Condition Durability in PEFCs
Lim, Soo-Jin ; Park, Gu-Gon ; Park, Jin-Soo ; Sohn, Young-Jun ; Yim, Sung-Dae ; Yang, Tae-Hyun ; Kim, Chang-Soo ;
Transactions of the Korean hydrogen and new energy society, volume 20, issue 4, 2009, Pages 309~316
The effect of gas diffusion layers (GDLs) on the freeze/thaw condition durability in polymer electrolyte fuel cells (PEFCs) were investigated. For this purpose, three kinds of GDLs, such as, felt, paper and cloth types with different basic properties have been first prepared, then the changes in the properties and performance of cells was observed during the freeze/thaw cycles ranging from -30 to
. The performance evaluations were conducted by using the single cells consisting of different GDLs. The performance degradation and the cell resistance increase could be directly correlated. The physical destruction of electrode was shown by SEM analysis. The mechanically supporting ability on the interface between the cell components can help enhancing the durability of PEFCs in the freeze/thaw condition.
A Study on Performance Degradation of PEMFC by Repetitive Startup/Shutdown Cycling
Jo, Yoo-Yeon ; Cho, Eun-Ae ; Kim, Jung-Hyeun ;
Transactions of the Korean hydrogen and new energy society, volume 20, issue 4, 2009, Pages 317~322
To investigate degradation mechanism of PEMFC operated with repetitive startup/shutdown cycling, i-V characteristics, impedance, cyclic voltamograms were measured. OCV decreased from 0.967 to 0.951 V while the cell voltage at 800mA/
from 0.657 to 0.563V, implying that the electrodes rather than membrane electrolyte was damaged during the cycling operation. Electrochemical analyses supported that the performance degradation could be mainly attributed to degradation of the electrodes such as a decrease in electrochemical active surface area rather than degradation of membrane.
Water Repellent Coating of GDL with Different Concentration of Nano-sized PTFE Solution
Jeong, Moon-Gook ; Song, Ki-Se ; Cho, Tae-Hwan ; Choi, Weon-Kyung ;
Transactions of the Korean hydrogen and new energy society, volume 20, issue 4, 2009, Pages 323~330
Efficiency of a fuel cell is determined by the generated water. If water is not removed sufficiently, water will be accumulated at GDL, which causes flooding. Therefore, water control is regarded as a crucial factor to sustain fuel ell performance. In this study, PTFE coating on the surface of carbon paper was carried out to establish optimum process for hydrophobic treatment of GDL. Carbon paper was immersed at different concentrations of nano-sized PTFE coating solution. Their characteristics were analyzed systematically by FE-SEM, water contact angle, cyclic voltamogam, XRD and FT-IR. The quantitative correlation between the amount of coated-PTFE on a carbon paper and concentration of coating solution was carefully investigated. It is suggested that the amount of PTFE-coating on a carbon paper can be managed by means of controling concentration of coating solution.
Effect of Phase Change of
Spillover Kinetics over Pt/
Kim, Jin-Gul ; Kim, Seong-Soo ; Yoo, Seung-Joon ;
Transactions of the Korean hydrogen and new energy society, volume 20, issue 4, 2009, Pages 331~336
A Study on Syngas Production By Noncatalytic Partial Oxidation of Methane
Na, Ik-Hwan ; Yang, Dong-Jin ; Choi, Sin-Yeong ; Chae, Tae-Young ; Bang, Byoung-Yeol ; Yang, Won ;
Transactions of the Korean hydrogen and new energy society, volume 20, issue 4, 2009, Pages 337~343
Noncatalytic partial oxidation of methane for producing synthesis gas was studied in a lab-scale experimental apparatus. Partial oxidation developed for high-temperature, fuel-rich combustion and it is exothermic process. but Steam reforming and Caron reforming is highly endothermic process to need much energy. Noncatalytic partial oxidation of methane is affected by temperature and equivalent ratio, so we studied effect about composition of synthesis gas at lab scale reactor. We used electronic heater to control the temperature of reactor. The quality of synthesis gas is improved and reduced heat value to require at Noncatalytic partial oxidation because the reacting temperature is lower at oxy condition.
Prediction of the Viable Operating Range of DME Heel Engine Using Thermal Stratification Based on Numerical Analysis
Jeong, Dong-Won ; Kwon, O-Seok ; Back, Young-Soon ; Lim, Ock-Taeck ;
Transactions of the Korean hydrogen and new energy society, volume 20, issue 4, 2009, Pages 344~351
A multi-zone model was used to predict the operating range of homogeneous charge compression ignition (HCCI) engine, the boundaries of the operating range were determined by knock (presented by ring intensity), misfire (presented by sensitivity of indicated mean effective pressure to the initial temperature). A HCCI engine fueled with Di-Methyl Ether (DME) was simulated under different initial temperature and equivalence ratios, and the operating range was well produced by the model. Furthermore, the model was applied to develop the operating range for thermal stratification in the preceding condition of initial temperature and equivalence ratios. The computations were conducted using Senkin application of the CHEMKINII kinetics rate code.
The Design Conditions and the Initial Operation Results of 1 Ton/Day Class Dry Feeding Coal-Gasification System
Seo, Hai-Kyung ; Chung, Jae-Hwa ; Ju, Ji-Sun ;
Transactions of the Korean hydrogen and new energy society, volume 20, issue 4, 2009, Pages 352~359
KEPRI is developing a Korean type coal-gasification system and the scale is 20 ton/day. Prior to this pilot plant, a 1 ton/day class gasification system will be used for pre-testing of several coal types. This paper introduces the configuration and design conditions of this 1 ton/day class system, presenting the gas/coal ratio, oxygen/coal ratio, cold gas efficiency, CFD analysis of gasifier, and others. The existing combustion furnace for residual oil was retrofitted as a coal gasifier and a vertical and down-flow type burner was manufactured. Ash removal is carried out through a water quencher and a scrubber following the quencher, and the sulfur is removed by adsorption in the activated carbon tower. The gas produced from the gasifier is burned at the flare stack. In this paper, the results of design conditions and initial operation conditions of I ton/day gasification system are compared together.