• Title, Summary, Keyword: 고분자연료전지

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Effect of the physical damages in MEAs on the properties of PEFCs (막전극접합체의 물리적 손상이 고분자연료전지 특성에 미치는 영향)

  • Lim, Soo-Jin;Park, Gu-Gon;Park, Jin-Soo;Park, Seok-Hee;Yoon, Young-Gi;Lee, Won-Yong;Lee, Young-Moo;Kim, Chang-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • pp.221-223
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    • 2007
  • 고분자전해질연료전지의 효율과 수명은 고분자 전해질 막과 밀접하게 관련되어있다. 연료전지 상용화를 위해 내구성과 안정성은 반드시 확보되어야 한다. 본 연구에서는 고분자전해질연료전지용 막전극접합체에 대해서 제작과정, 체결과정 및 운전 중에 발생할 수 있는 물리적 손상이 연료전지에 미치는 영향을 알아보고자 하였다. 실제 고분자전해질연료전지 조건에서 구멍이 생기는 경우를 모사하기 위해 막전극접합체에 다양한 크기 및 형상의 물리적 손상을 형성시켰다. 또한 여러 위치에서의 손상도 비교하였다. 손상시킨 막전극접합체에 대해 단위전지 성능평가와 순환전압전류 실험을 비교 분석하였다. 막전극접합체의 결함이 커질수록 수소기체투과도는 증가하고, OCV와 성능은 감소하였다. 또한 성능과 수소기체투과도는 서로 관련이 있음을 알 수 있었다.

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Property changes of GDLs and water behaviors in PEFCs (고분자전해질 연료전지 체결조건에서 기체확산층의 특성변화 및 물거동 확인)

  • Park, Gu-Gon;Lim, Nam-Yun;Ahn, Eun-Jin;Park, Jin-Soo;Yoon, Young-Gi;Lee, Won-Yong;Lim, Tae-Won;Kim, Chan-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • pp.313-315
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    • 2006
  • Proper water management is important to achieve high performance and durability of Polymer electrolyte fuel cell (PEFC). Among various stack components, gas diffusion layer (GDL) is considered as a core part to determine the gas and water transportation in a cell. To optimize the water management, the changes of properties as well as basic properties of GDLs were investigated before and after clamping of colls. Thickness, electric conductivity, porosity, hydroppobicity etc. were characterized by the same criteria. The amount of residual water after cell operation also was compared by direct measuring of weight. Based on the amount of residual water the endurance on the freeze condition was evaluated.

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THE OPERATING CHARACTERISTICS IN AN AIR-BREATHING POLYMER ELECTROLYTE FUEL CELL (공기 호흡형 고분자 전해질 연료전지 제작 및 발전 특성 연구)

  • SOHN Young-Jun;PARK Gu-Gon;UM Sukkee;YIM Sung-Dae;Yang Tae-Hyun;YOON Young-Gi;LEE Won-Yong;KIM Chang-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • pp.277-280
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    • 2005
  • Air-breathing polymer electrolyte membrane fuel cells (PEMFC) are highly promising particularly for small-power applications up to tens watts class. A distinctive feature of the air-breathing PEMFC is its simple system configuration in which axial fans operate for dual purposes, supplying both oxidant and coolant in a single manner. In the present study, a nominal SOW air-breathing PEMFC system is developed and investigated to determine the optimal operating strategy through parametric studies (i.e., reactant humidity, and fan-blowing flow rate). The cell voltage distributions are examined as a function of time to evaluate the system performance under various operating conditions.

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Property changes of PEFCs at the sub-zero temperature conditions (영하조건에서 고분자전해질 연료전지의 특성 변화)

  • Lim, Soo-Jin;Park, Gu-Gon;Park, Jin-Soo;Park, Seok-Hee;Yoon, Young-Gi;Lee, Won-Yong;Lim, Tae-Won;Lee, Young-Moo;Kim, Chang-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • pp.212-215
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    • 2007
  • 고분자전해질연료전지 시스템이 영하 조건에 노출될 경우, 셀의 성능 및 내구성에 미치는 영향을 실험적으로 확인해 보았다. -30 $^{\circ}C{\sim}70$ $^{\circ}C$ 조건을 반복 경험시키며, 성능저하 정도를 살펴보았다. 일반적인 운전조건과 동결/해동에 의한 성능저하 요인을 분리하여 확인하기 위해, 30 $^{\circ}C{\sim}70$ $^{\circ}C$ 범위의 사이클을 진행한 경우에 대해, 위와 통일한 분석을 통하여 성능 및 각종 물성 값의 변화를 비교하였다. 동결조건에서 셀의 성능저하는 형성된 얼음의 물리적 부피팽창으로 인한 계면저항의 증가가 주요 원인임을 밝힐 수 있었다.

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Development of Fuel Cell/Battery Hybrid Vehicle (연료전지/배터리 하이브리드 차량 개발)

  • Son Yeong Jun;Park Gu Gon;Im Seong Dae;Eom Seok Gi;Yang Tae Hyeon;Yun Yeong Gi;Lee Won Yong;Kim Chang Su
    • 한국전기화학회:학술대회논문집
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    • pp.103-110
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    • 2005
  • Fuel cell systems are consisted of various parts, for example fuel cell stack, fuel supplier, electrical converters, controllers and so on. Each components of system should have appropriate specification for their applications as well as simplicity. Because thermal load can be managed simply by using fans without any water cooling system, the air-cooled PEMFC is widely used in sub kW and around 1kW systems. The performance of an air-cooled system is highly dependent on ambient temperature and humidity. In this paper, the air-cooled PEMFC systems are developed and investigated to study the operating characteristics in the aspect of the thermal and water coupled management by the control of the axial fans and compressors. Various experiments were also conducted to get the cell voltage distribution, the relative humidity of the reactant gas and the thermal management by axial cooling fans, which cannot be observed in single cell experiment. After then, as practical applications, portable fuel cell system and a hybrid electric cart were successfully integrated and operated by using this air-cooled stack.

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