• Title/Summary/Keyword: Fuel Cells

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Development of Bipolar Plate Stack Type Microbial Fuel Cells

  • Shin, Seung-Hun;Choi, Young-jin;Na, Sun-Hee;Jung, Seun-ho;Kim, Sung-hyun
    • Bulletin of the Korean Chemical Society
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    • v.27 no.2
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    • pp.281-285
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    • 2006
  • Microbial fuel cells (MFC) stacked with bipolar plates have been constructed and their performance was tested. In this design, single fuel cell unit was connected in series by bipolar plates where an anode and a cathode were made in one graphite block. Two types of bipolar plate stacked MFCs were constructed. Both utilized the same glucose oxidation reaction catalyzed by Gram negative bacteria, Proteus vulgaris as a biocatalyst in an anodic compartment, but two different cathodic reactions were employed: One with ferricyanide reduction and the other with oxygen reduction reactions. In both cases, the total voltage was the mathematical sum of individual fuel cells and no degradation in performance was found. Electricity from these MFCs was stored in a supercapacitor to drive external loads such as a motor and electric bulb.

Establishment of Korea Gas Safety Standards for Hydrogen Appliance Inspection in Accordance with Hydrogen Law (수소법에 따른 수소용품 검사시행에 대비한 기술기준 제정)

  • Jung, Jae-Hwan;Kim, Wan-Jin
    • Journal of the Korean Institute of Gas
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    • v.25 no.6
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    • pp.80-84
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    • 2021
  • As the Hydrogen law was enacted, 4 types of hydrogen appliances were designated as inspection products. The types of hydrogen appliances are water electrolysis equipment, hydrogen extraction equipment, stationary fuel cells, and mobile fuel cells. The establishment fo safety standards for hydrogen appliance inspection defines risk factors for each hydrogen appliance and stipulates safety standards to prevent risk factors. The main safety standards for each hydrogen appliance are hydrogen quality and safety control for water electrolysis, toxic substances emission prevention and carbon monoxide emission prevention for hydrogen extraction facilities, vibration safety for mobile fuel cells.

Cell Voltage Monitoring of PEMFC Power Module for Fuel Cell Electric Vehicle (연료전지 차량용 PEMFC 발전모듈의 셀전압 측정)

  • Park Hyunseok;Jeon Ywunseok;Ku Bonwoong;Choi Seoho
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.06a
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    • pp.388-391
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    • 2005
  • In this paper, Cell voltage monitoring method is studied for fault detection of PEMFC(Proton Exchange Membrane Fuel Cell) for FCEV(fuel cell electric vehicle). To measuring several hundred of cells in fuel cell stack, The demanded feature of hardware and software is studied and several types are analysed. Finally, $3.26\%$ maximum measuring error is acquired and verified experimentally.

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Competitive electrochemical oxidation of reformate gas in SOFCs (고체 산화물 연료전지 음극에서 개질 가스의 경쟁적 전기화학 반응)

  • Kim, Yong-Min;Bae, Joong-Myeon;Bae, Gyu-Jong;Kim, Jung-Hyun;Lee, Chang-Bo
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.5-8
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    • 2008
  • SOFC (Solid oxide fuel cell) has an advantage in the term of fuel flexibility, comparing with other kinds of fuel cells. In SOFC and fuel reformer cooperation system, the reformate gas with the various $H_2$/CO ratios is delivered into the anode of SOFC. In this situation, electrochemical oxidation reactions of the reformate gas in the anode are complex and competitive. In this paper, the effects of the composition of $H_2$ and CO on the overall electrochemical oxidation at Ni-YSZ anode are studied by testing the open circuit voltage (OCV) and current-voltage characteristics of single cells.

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Dynamic Transient Phenomena of a Proton Exchange Membrane Fuel Cells (PEMFC 연료전지의 과도현상 특성)

  • Lee, Ying;Choi, Yong-Sung;Zhang, You-Sai;Lee, Kyung-Sup
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.203-203
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    • 2010
  • The proton exchange membrane fuel cell (PEMFC) is different from the normal power supply, and it is a nonlinear, multi-input, strong coupling, the complex dynamic system with large time delay. At present, many studies on the content of the fuel cell fuel cells focus on a static process, this paper analyzed in subsequent sections of the process of fuel cell dynamic response time of transition, and then it found the method to reduce the response time during the process of load change to ensure that the stability of output power.

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Characterization of Nitrogen Gas Crossover in PEM Fuel Cell Stacks (고분자 연료전지 스택에서 질소 크로스오버 특성에 관한 연구)

  • Baik, Kyung-Don;Kim, Min-Soo
    • Proceedings of the KSME Conference
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    • 2008.11b
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    • pp.2227-2230
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    • 2008
  • Crossover of nitrogen from cathode to anode is inevitable in typical membranes used in PEM fuel cells. This crossovered nitrogen accumulates in anode recirculation system and excessive buildup of nitrogen in the recirculating anode gas lowers the hydrogen concentration and finally affects the performance of fuel cell stacks. In this study, characterization of nitrogen gas crossover was investigated in PEM fuel cell stacks. The mass spectroscopy (MS) has been applied to measure the amount of the crossovered nitrogen at the exit of anode. Results show that anode and cathode stoichiometric number ($SR_c$) have a big effect of nitrogen crossover.

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Stack Performances of Proton Exchange Membrane Fuel Cell

  • Kho, Young-Tai;Cho, Won-Ihl;Park, Yong-Woo-
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 1994.11a
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    • pp.14-16
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    • 1994
  • The development of proton exchange membrane fuel cells(PEMFCs) with high energy efficiencies and high power densities is gaining momentum because their performance characteristics are attractive for terrestrial(power sources for electrical vehicles, stand-by power), space and underwater application[1]. Fuel cells are capable of running on non-petroleum fuels such as methanol, natural gas or hydrogen and also have major impact on improving air quality. They virtually eliminate particulates, NO$_{x}$, SO$_{x}$, and significant reduce hydrocarbons and carbon monoxide. Especially, fuel cell-battery hybrid power sources appear to be well suited to overcome both the so-called battery problem(low energy density) and the fuel cell problem(low power density)[2].[2].

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Electrical Modeling of 10kW PEMFC

  • Lee, Jin-Mok;Park, Ga-Woo;Choi, Jae-Ho
    • Proceedings of the KIPE Conference
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    • 2008.10a
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    • pp.193-195
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    • 2008
  • As arising the cost and decreasing of gasoline and fossil fuel, renewable energy sources such as photovoltaics, wind and fuel cell have been interested. Among of them, PEM fuel cells are good energy sources to provide reliable power at steady state regardless of weather, time of day and location as long as the fuel and air are supplied, but they cannot respond to electrical load transients as fast as desired. This is mainly due to their slow internal electrochemical and thermodynamic responses. Therefore, to use the fuel cells with high efficiency, this paper finds characteristic curve and understand operation of PEMFC based on three theoretical approaches such as activation, ohmic and concentration and make the model using MATLAB. That result was compared with real system to certify.

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Prediction of Membrane Water Content Characteristics through Dynamic Nonlinear Model (비선형 동특성 모델을 통한 전해막 습증기 함유도 특성 예측)

  • LEE, CHANHEE;KIM, YOUNGHYEON;YU, SANGSEOK
    • Transactions of the Korean hydrogen and new energy society
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    • v.32 no.6
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    • pp.497-505
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    • 2021
  • Water management is essential to improve the performance of proton exchange membrane fuel cells. This study targets to understand the characteristics of water concentration in proton exchange membrane fuel cells at a dynamic load variable environment. The fuel cell model was developed to simulate nonlinear water transport in membrane by the MATLAB/Simulink® (MathWorks, Natick, MA, USA) platform, and it calculates water content in membrane, ionic conductivity, and predicts fuel cell performance through one-dimensional analysis.