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Influence of water behavior in the gas diffusing layer one the performance of PEMFC
박구곤,손영준,임성대,양태현,윤영기,이원용,김창수 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
Experimentally, the affect of water behavior on the performance of polymer electrolyte membrane fuel cell(PEMFC) was investigated. To understand the water transportation phenomena systematically, the gas diffusion layers were divided to two parts. One is gas diffusion medium(GDM) and the other is micro-layer(ML). In this work, GDM with different PTFE contents was intensively investigated at various single cell operation conditions. I-V performance curves of single cells were compared and analyzed with respect to water transportation in the GDM. By this work, the dominant driving forces of the water transportation in the gas diffusion layer were suggested for the design of gas diffusion layers.
Analysis on the freeze/thaw cycled polymer electrolyte fuel cells
박구곤,Soo-Jin Lim,박진수,임성대,박석희,양태현,윤영기,김창수 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Enhancement of system durability at the sub-freezing temperature is one of critical issues for the commercialization of polymer electrolyte fuel cell (PEFC) applications. In this work, effects of residual water at the sub-freeze condition on the gas diffusion layer (GDL)/membrane-electrode assembly (MEA) were investigated for the successful cold start-up of PEFC. The performance changes of MEAs were observed by 300 times of freeze/thaw (F/T) cycles with well designed single cell. The post analysis for the (-30 to 70) ℃ F/T cycled MEA were conducted. The gradual decreases of I–V performance were observed after the F/T cycle number of 70. About 0.4 mV/cycle of degradation at 1 A/㎠ could be obtained at the controlled operating conditions. The main cause of performance decrease was in the weakened adhesion between the electrodes and membrane interface. The SEM images as well as cell resistance changes directly supported the degradation reasons of cell performance in the freeze condition.
동결/해동 조건에서 기체확산층의 물성이 고분자전해질연료전지의 내구성에 미치는 영향
박구곤(Park, Gu-Gon),임수진(Lim, Soo-Jin),박진수(Park, Jin-Soo),손영준(Sohn, Young-Jun),임성대(Yim, Sung-Dae),김창수(Kim, Chang-Soo),양태현(Yang, Tae-Hyun) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
The effect of the kind 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, i.e., 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 70 ?C. The single cells consisting of different GDLs were evaluated for performance. The performance degradation and the cell resistance increase could be directly correlated. The physical destruction of electrode was shown by SEM analysis. It was presented that mechanical supporting force of interface between materials can help enhancing the durability of PEFCs in the freeze/thaw condition.
박구곤(Park, Gu-Gon),임남윤(Lim, Nam-Yun),손영준(Sohn, Young-Jun),박진수(Park, Jin-Soo),이원용(Lee, Won-Yong),김세훈(Kim, Sae-Hoon),임태원(Lim, Tae-Won),김창수(Kim, Chang-Soo) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Water management in polymer electrolyte membrane fuel cells(PEMFCs) is one of the most challenging issues. Freeze start-up in the automotive applications is also important research topic in the PEMFC field. Transportation of proton and separation of reactant gases are main roles of polymer electrolyte membranes. It has been known that water in the membrane conducts as a vehicle for the proton transportation. At sub-zero temperature, the frozen water blocks the access of reactant gases to the active sites of electrode as well as occurs the physical destruction of fuel cell structures. In this study, property changes of electrolyte membranes in the freeze conditions (at;-25?C) were investigated. For the various amount of water contained membranes, the property changes, especially for the proton conductivity, were observed after several times of freeze/thaw(-25~80?C) cycle.
고분자전해질 연료전지 체결조건에서 기체확산층의 특성변화 및 물거동 확인
박구곤(Park, Gu-Gon),임남윤(Lim, Nam-Yun),안은진(Ahn, Eun-Jin),박진수(Park, Jin-Soo),윤영기(Yoon, Young-Gi),이원용(Lee, Won-Yong),임태원(Lim, Tae-Won),김창수(Kim, Chan-Soo) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
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.
임성대,박구곤,이상헌,윤영기,이원용,김창수,서동주,윤왕래 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
소형 연료전지는 최근 휴대용 가전제품들의 고출력 전원에 대한 요구를 만족시키는 최선의 대안으로서 그 연구가 활발히 진행 중이다. 소형 연료전지 기술로는 그 동안 주로 직접메탄올 연료전지에 대하여 연구가 진행되어 왔지만 최근에는 소형 개질기를 기반으로 한 고분자 연료전지 기술의 접근이 또한 진행되고 있다. 고분자 연료전지의 소형화에 있어서 가장 큰 기술적 난관중의 하나로는 수소 공급기의 소형화이며, 이를 해결하기 위하여 마이크로채널 반응기를 이용한 메탄올 개질기의 개발이 본 연구에서 수행되었다. 메탄올 개질기는 증발기, 열교환기, 개질반응기, 촉매연소기 등의 단위 반응기로 구성되며 이들 반응기를 효과적으로 구성하여 단위부피당 최대의 수소발생을 가능케 하는 것이 본 기술의 핵심이 된다. 본 연구에서는 마이크로 채널 반응기를 이용한 소형 메탄올 개질기 개발을 위하여 마이크로채널 설계, 가공 및 접합, 촉매 담지, 반응기 구성 및 반응 변수들의 고찰 등의 연구를 수행하였으며 이를 바탕으로 소형 메탄올 개질기를 개발하였다.
이원용,박구곤,손영준,김승곤,김민진 한국수소및신에너지학회 2017 한국수소 및 신에너지학회논문집 Vol.28 No.3
Fuel cell systems have to satisfy acceptable operating reliability, sufficient lifetime and price to enter the market in competition with existing products. Fuel cells are made up of complex element technologies and various problems related to the failure of the components can affect the reliability and safety of the system. This problem can be overcome by introducing a monitoring and supervisory control system in addition to automatic control to detect the failure of the fuel cell quickly and properly diagnose the performance degradation. For the fault detection and diagnosis of polymer electrolyte fuel cells, the model based method using the theoretical superposition value and the non-model based method of checking the signal tendency or the converted signal characteristic can be applied. The methods analyzed in this paper can contribute to the development of integrated monitoring and control technology for the whole system as well as the stack.