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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 25, Issue 6 - Dec 2014
Volume 25, Issue 5 - Oct 2014
Volume 25, Issue 4 - Aug 2014
Volume 25, Issue 3 - Jun 2014
Volume 25, Issue 2 - Apr 2014
Volume 25, Issue 1 - Feb 2014
Selecting the target year
The Characteristics of HI Decomposition using Pt/Al
Catalyst Heat Treated in Air and Hydrogen Atmosphere
Park, Eun Jung ; Ko, Yun Ki ; Park, Chu Sik ; Kim, Chang Hee ; Kang, Kyoung Soo ; Cho, Won Chul ; Jeong, Seong Uk ; Bae, Ki Kwang ; Kim, Young Ho ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 219~226
DOI : 10.7316/KHNES.2014.25.3.219
In HI decomposition,
has been studied by several researchers. However, after HI decomposition, it could be seen that metal dispersion of
was greatly decreased. This reason was expected of platinum loss and sintering, which platinum was aggregated. Also, this decrease of metal dispersion caused catalytic deactivation. This study was conducted to find the condition to minimize platinum sintering and loss. In particular, heat treatment atmosphere and temperature were examined to improve the activity of HI decomposition reaction. First of all, although
treated in hydrogen atmosphere had low platinum dispersion between 13 and 18%, it was shown to suitable platinum form that played an important role in improving HI decomposition reaction. Oxygen in the air atmosphere made
have high platinum dispersion even 61.52% at
. Therefore, in order to get high platinum dispersion and suitable platinum form in HI decomposition reaction, air heat treatment at
was needed to add before hydrogen heat treatment. In case of 5A3H, it had 51.13% platinum dispersion and improved HI decomposition reaction activity. Also, after HI decomposition reaction it had considerable platinum dispersion of 23.89%.
A Study on Cu Based Catalysts for Water Gas Shift Reaction to Produce Hydrogen from Waste-Derived Synthesis Gas
Na, Hyun-Suk ; Jeong, Dae-Woon ; Jang, Won-Jun ; Lee, Yeol-Lim ; Roh, Hyun-Seog ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 227~233
DOI : 10.7316/KHNES.2014.25.3.227
Simulated waste-derived synthesis gas has been tested for hydrogen production through water-gas shift (WGS) reaction over supported Cu catalysts prepared by co-precipitation method.
, MgO, and
were employed as supports for WGS reaction in this study.
catalyst exhibited excellent catalytic activity as well as 100%
selectivity for WGS in severe conditions ($GHSV
Dynamics Study with DFT(Density Functional Theory) Calculation for Metal with a few Peripheral Electrons
Kim, Taewan ; Park, Taesung ; Jung, Yeonsung ; Kang, Youngjin ; Lee, Taeckhong ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 234~239
DOI : 10.7316/KHNES.2014.25.3.234
To study catalytic activity and hydrogen embrittlement of Pd, Pt, Ni, and Cr in fuel cell electrode, we used density-functional theory. The calculation tools based electron density give much shorter calculation time and cheap costs. Maximum of bond overlap populations of each metal are 0.6539eV for Pd-H, 0.6711eV for Pt-H, 0.6323eV for Ni-H, 0.6152eV for Cr-H. Electron density of Cr has strongest in related metals, which shows strong localization of electron, implying anti hydrogen embrittlement behaviors.
The Study on Development of Performance in Cryogenic Piston Pump
Lee, Jongmin ; Lee, Jonggoo ; Lee, Kwangju ; Lee, Jongtai ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 240~246
DOI : 10.7316/KHNES.2014.25.3.240
In order to develop a universal cryogenic piston pump of small size for increasing utilization of liquid hydrogen, dynamic compression performance of piston pump were evaluated and improvements were also discussed for piston rod and piston tip. The cryogenic piston pump has crosshead structure and inclined cup shape piston tip. As the results, it was found that i) insulation of heat flow from piston-rod part is required for stable operation ii) improving the self-clearance adjustment effect of piston tip and reducing piston eccentricity were desirable to promote pumping pressure and operating range.
The Effect of Promotor and Reaction Condition for FT Oil Synthesis over 12wt% Co-based Catalyst
Park, Yonhee ; Lee, Jiyoon ; Jung, Jongtae ; Lee, Jongyeol ; Cho, Wonjun ; Baek, Youngsoon ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 247~254
DOI : 10.7316/KHNES.2014.25.3.247
The synthesis of Fischer-Tropsch oil is the catalytic hydrogenation of CO to give a range of products, which can be used for the production of high-quality diesel fuel, gasoline and linear chemicals. Our cobalt based catalyst was prepared Co/alumina, silica and titania by the incipient wet impregnation of the nitrates of cobalt and promoter with supports. Cobalt catalysts was calcined at
before being loaded into the FT reactors. After the reduction of catalyst has been carried out under
for 24hrs, FT reaction of the catalyst has been carried out at GHSV of 4,000/hr under
and 20atm. From these test results, we have obtained the results as following ; in case of 12wt% Co-supported
catalysts, maximum activities of the catalysts were appeared at the promoters of Mn, Mo and Ce respectively. The activity of 12wt%
added a Mn promoter was about 3 times as high as that of 12wt%
catalyst without promoters. When it has been the experiment at the range of reaction temperature of
and GHSV of 1,546~5,000/hr, the results have shown generally increasing the activities with the increase of reaction temperature and GHSV.
A Construction Plan of Hydrogen Fueling Stations on Express Highways Using Geographic Information System
Gim, Bongjin ; Kook, Ji Hoon ; Cho, Sang Min ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 255~263
DOI : 10.7316/KHNES.2014.25.3.255
This paper deals with a construction plan of hydrogen fueling stations on express highways using geographic information system. We analyzed the existing hydrogen fueling stations and production facilities to construct the hydrogen supply system to satisfy the hydrogen demands. Also, we suggested the necessary number and locations of hydrogen fueling stations on express highways for operating fuel cell vehicles. As a result, we need to construct at least 6 hydrogen stations on express highways in 2020 and 14 hydrogen stations in 2025. In 2030, when fuel cell vehicles are expected to spread over the whole nation, 114 hydrogen stations are needed to construct on express highways. This study mainly utilized the information of distances between hydrogen production facilities and fueling stations. However, we need to analyze the other factors such as traffic and income data. Also, it is necessary to make a suitable construction plan of hydrogen fueling stations that should be constructed on each district using geographic information system.
Demonstration Results of Fuel Cell Buses of Hyundai Motor Company
Park, Jeongkyu ; Lee, Seungyoon ; Kim, Donghoon ; Jin, Youngpin ; Park, Jongjin ; Kim, Saehoon ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 264~270
DOI : 10.7316/KHNES.2014.25.3.264
Fuel cell technology is the most representative area of alternative energy field on vehicle industry according to the limitation of petroleum resources. In recent years, the technology of fuel cell vehicles has made rapid progress, Hyundai Motor Company (HMC) reached to mass production of the Tucson ix hydrogen fuel cell vehicles first in the world. In addition, HMC is accelerating the development of hydrogen fuel cell buses, which have a number of advantages for hydrogen infrastructure and mass transport personnel. In this study, we examined potential of the commercialization through the demonstration of hydrogen fuel cell buses. As a result, we identified that the mass-production possibility of FCB has high potential and HMC`s technology will lead to fuel cell bus industry.
Development of a 25kW-Class PEM Fuel Cell System for the Propulsion of a Leisure Boat
Han, In-Su ; Jeong, Jeehoon ; Kho, Back-Kyun ; Choi, Choeng Hoon ; Yu, Sungju ; Shin, Hyun Khil ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 271~279
DOI : 10.7316/KHNES.2014.25.3.271
A 25kW-class polymer electrolyte membrane (PEM) fuel cell system has been developed for the propulsion of a leisure boat. The fuel cell system was designed to satisfy various performance requirements, such as resistance to shock, stability under rolling and pitching oscillations, and durability under salinity condition, for its marine applications. Then, the major components including a 30kW-class PEM fuel cell stack, a DC-DC converter, a seawater cooling system, secondary battery packs, and balance of plants were developed for the fuel cell system. The PEM fuel cell stack employs a unique design structure called an anodic cascade-type stack design in which the anodic cells are divided into several blocks to maximize the fuel utilization without hydrogen recirculation devices. The performance evaluation results showed that the stack generated a maximum power of 31.0kW while maintaining a higher fuel utilization of 99.5% and an electrical efficiency of 56.1%. Combining the 30-kW stack with other components, the 25kW-class fuel cell system boat was fabricated for a leisure. As a result of testing, the fuel cell system reached an electrical efficiency of 48.0% at the maximum power of 25.6kW with stable operability. In the near future, two PEM fuel cell systems will be installed in a 20-m long leisure boat to supply electrical power up to 50kW for propelling the boat and for powering the auxiliary equipments.
A Study of Ceria on Low-temperature Sintering Using Sintering Aids for Solid Oxide Fuel Cells
Oh, Chang Hoon ; Song, Kwang Ho ; Han, Jonghee ; Yoon, Sung Pil ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 280~288
DOI : 10.7316/KHNES.2014.25.3.280
SDC (Samarium doped Ceria) electrolyte was developed for Intermediate temperature SOFC (
) which showed a good electrical conductivity. In this study, we used sintering aids to reduce the SDC sintering temperature down to
, especially which can help the SOFC scale-up. In order to reduce the SDC sintering temperature,
were used as a sinering aids for decreasing sintering temperature.
doped SDC sintered at
showed 99% of the theoretical density and higher electrical conductivity than the pure SDC sintered at
. When measuring the OCV (Open circuit voltage) with the
doped SDC electrolyte, however, the OCV values were lower than the theoretical OCV values which means that the modified SDC still had electronic conductivity.
The Study on the Cell Electrochemical Properties with Increasing Water content in Dye-Sensitized Solar cells
Seo, Hyun Woo ; Kim, Dong Min ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 289~296
DOI : 10.7316/KHNES.2014.25.3.289
Here, we have studied the effect of water added electrolyte on the photovoltaic performance of dye-sensitized solar cells (DSSCs). It was found that open-circuit voltage (
) increased and short-circuit current density (
) decreased with the increase of the amount of added water in the electrolyte of the DSSCs. Electrochemical impedance spectroscopy (EIS) study showed that the electrolyte with added water shifted the dye loaded
conduction band upward that eventually increased
of the cells. On the other hand, the upward shift of
conduction band decreased the driving force for the electron injection from the lowest unoccupied molecular orbital (LUMO) of the dye molecules to the conduction band of
that resulted in decreased
Performance of the Geothermal Heat Pump using Vapor Injection for Hot Water
Park, Yong-Jung ; Park, Byung-Duck ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 297~304
DOI : 10.7316/KHNES.2014.25.3.297
The purpose of this study is to evaluate the experimental performance characteristics of a water-to-water geothermal heat pump featuring a vapor refrigerant injection for the production of hot water. The performance of geothermal heat pump with a vapor injection was evaluated by comparing with that of a conventional geothermal heat pump without a vapor injection. For heating operation, the geothermal heat pump with a vapor injection is superior in COP and heating capacity. The vapor injection was more effective for supplying hot water while overloading. The vapor injection was effective for the improvement of the cooling capacity. However, the vapor injection was not effective for the increasing of COP according to the increased input of a compressor. The advantage of vapor injection in water-to-water geothermal heat pump become disappeared while cooling operation with lower part loading.
Effects of Co-solvent on Passivation Film of Lithium Surface
Kang, Jihoon ; Jeong, Soonki ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 305~310
DOI : 10.7316/KHNES.2014.25.3.305
This study examined the morphological changes in lithium surface immersed in 1mol
dissolved in propylene carbonate (PC) containing different 1,2-dimethoxyethane (DME) concentrations as a co-solvent. A passivation film was formed on the surface of lithium metal by electrolyte decomposition. The passivation film formation reactions were significantly affected by the amount of co-solvent, DME, in electrolyte solution. A stable film was obtained from the 1 M
/ PC:DME (67:33) solution in which lithium electrode showed good electrochemical performances. Atomic force microscope (AFM) and electrochemical impedance spectroscopy (EIS) results revealed that there were no direct correlations between changes in the surface morphology of lithium metal and the resistance behavior of its passivation film.
Performance Degradation of a Battery in an Energy Storage System (ESS) under Various Operating Conditions and Monitoring Study of ESS Connected with Photovoltaic
Jung, Euney ; Jung, Hanjoo ; Jeong, Younki ; Lee, Jaeyoung ; Lee, Hongki ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 311~318
DOI : 10.7316/KHNES.2014.25.3.311
Performance degradation of a battery in 20 kWh energy storage system (ESS) under various operating conditions was studied. And energy saving of the ESS was also monitored by connecting with 20 kW photovoltaic (PV). PV-connected ESS saved 5~7% of energy consumption in 2013 compared to that without such system in 2012. As charge-discharge cycle increased, capacity decreased and the performance degradation was glaringly obvious after 40 cycles. And as charge and discharge rate increased, the performance degradation was more serious. After 50 charge-discharge cycles, a lot of degraded product was deposited on the surface of anode and cathode electrodes, and the cathode side was more contaminated. Therefore, in order to maintain the cell performance, it was more important to protect the degradation of the cathode side.
A Study on Economic Evaluation of SNG Project using Real Option Valuation Model
Kang, Seung Jin ; Hong, Jin Pyo ;
Transactions of the Korean hydrogen and new energy society, volume 25, issue 3, 2014, Pages 319~335
DOI : 10.7316/KHNES.2014.25.3.319
This study attempts to suggest an economic analysis model for SNG projects, which can reflect the future uncertainty objectively and applies the real option valuation incorporating the flexible investment decision. Based on this analysis model, net present value and internal rate of return were estimated by using preliminary feasibility study report of SNG project. And economic evaluation of SNG project was performed with real option valuation using binomial option model. Through this, the difference of analysis results between the real option valuation model and the discounted cash flow model were compared and the usefulness of the real option valuation model was confirmed. From the actual proof analysis, it is confirmed that the real option valuation model showed higher SNG project value than the discounted cash flow model did. It was confirmed that by applying the real option valuation model, economic analysis can be performed on not only the current straightforward SNG project, but also various future portfolios having options such as expansion, modification, or decommission.