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Development and Evaluation of Gasket for Polymer Electrolyte Membrane Fuel Cell Stacks
서하규(Seo, Hakyu),한인수(Han, In-Su),정지훈(Jung, Jeehoon),김민성(Kim, Minsung),신현길(Shin, Hyungil),허태욱(Hur, Taeuk),조성백(Cho, Sungbaek) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
The design and fabrication of a metallic bipolar plate-gasket assembly for polymer electrolyte fuel cells (PEMFCs) is defined. This bipolar plate-gasket assembly was prepared by inserting a previously prepared bipolar plate in the specially designed gasket mold. For this aim, a proprietary fluoro-silicone based rubber was injected directly into the bipolar plate borders. Gaskets obtained like this showed the chemically / physically stable and the good sealibilty in typically operating PEM fuel cell conditions. And also, this bipolar plate-gasket assembly shows lots of advantages with respect to traditional PEMFCs stack assembling systems: useful application to automative stacking due to easy handling, reduced fabrication time, possibility of quality control and failed elements substitution. This bipolar plate-gasket assembly was evaluated in the short fuel cell stack and met the leakage requirement for normal operation both in short-term and in long-term operation. Especially, it was confirmed that this gasket could be applied successfully even in the high pressure FEM fuel cell systems(over 2.0 bar in absolute pressure).
서하규(Seo, Hakyu),한인수(Han, In-Su),정지훈(Jung, Jeehoon),김민성(Kim, Minsung),신현길(Shin, Hyungil),허태욱(Hur, Taeuk),조성백(Cho, Sungbaek) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
The coated metallic bipolar plates are getting attractive due to their good feasibility of mass production, low contact resistance, high electrical/thermal conductivity, low gas permeability and good mechanical strength comparing with graphite materials. Yet, metallic bipolar plates for polymer electrolyte membrane(PEM) fuel cells typically require coatings for corrosion protection. Other requirements for the corrosion protective coatings include low electrical contact resistance between metallic bipolar plate and gas diffusion layer, good mechanical robustness, low mechanical and fabrication cost. The authors have evaluated a number of protective coatings deposited on stainless steel substrate by electroplating. The coated metallic bipolar plates are investigated with an electrochemical polarization tests, salt dipping tests, adhesion tests for corrosion resistance and then the contact resistance was measured. The results showed that the selective samples electroplated with optimized method, satisfied the DOE target for corrosion resistance and contact resistance, and also were very stabilized in the typical fuel cell environments in the long-term.
Development of high durable metallic bipolar plate for Polymer Electrolyte Membrane Fuel Cells
김민성(Kim, Minsung),서하규(Seo, Hakyu),한인수(Han, In-Su),정지훈(Jung, Jeehoon),신현길(Shin, Hyungil),허태욱(Hur, Taeuk),조성백(Cho, Sungbaek) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Metallic bipolar plate is the one of the promising candidate material for PEMFC because of mechanical strength, low gas permeability, electrical and thermal conductivity. However, the corrosion is the main obstacle of metallic bipolar plate, and many investigations, especially coating on base metal, have been carried out to avoid corrosion. Gold is considered as the one of the best coating material because of its corrosion resistance and electrical conductivity. In this study, gold coated metallic bipolar plate was developed and evaluated. Due to our coating process, gold can be well-adhere to the base material, and hydrophobic material on its gold surface was coated by dipping method for better water management. To verify coating reliability, a single fuel cell(50cm2) was evaluated, and its durability over 4000hrs was demonstrated.
한인수(Han, In-Su),서하규(Seo, Hakyu),정지훈(Jung, Jeehoon),김민성(Kim, Minsung),신현길(Shin, Hyunkhil),허택욱(Hur, Taeuk),조성백(Cho, Sungbaek) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
A high efficiency polymer electrolyte membrane (PEM) fuel cell stack was developed for pressurized pure hydrogen and oxygen supplying conditions. The design objective for the cell stack was to maximize the electric efficiency and to minimize exhaust-gas emissions from it simultaneously. To achieve this objective, the cell stack was designed to use pure hydrogen and oxygen as fuel and oxidant, respectively, and to be operated under high gas inlet pressures and in a stage-wise dead-end operation mode. Major components constituting the cell stack, such as membrane electrode assembly, bipolar-plate, and gasket, have been developed to meet a target durability even in severe operating conditions: high gas inlet pressures and usage of pure oxygen. A high-power fuel cell stack was assembled using these components to verify the performance. The cell stack showed a good performance in terms of the efficiency and maximum power output.
경량화 가능한 C/Pad 코어용 고강성/고충격 PP 복합재 개발
손창완(Changwan Son),김현돈(Hyundon Kim),전용(Yong Chun),오민근(Mingeun Oh),서하규(Hakyu Seo),이명렬(Myungryeol Lee) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
To increasing fuel efficiency, every car maker research and develop parts more lightlyt. For weight reduction of part, we need not only thinner wall design, but also development of high modulus plastic material. This study is about design and material optimization, to apply low density polypropylene filled long glass fiber and rubber for IP structure. We developed 2.8kg IP structure with 20wt% long glass fiber filled high impact and modulus polypropylene and thin wall designed of 1.8~2.5mm.
Dead-end Mode Operation of a Large Scale PEM Fuel Cell Stack
정지훈(Jeong, Jeehoon),신현길(Shin, Hyunkhil),한인수(Han, In-Su),서하규(Seo, Hakyu),김민성(Kim, Minsung),조성백(Cho, Sungbaek),허태욱(Hur, Taeuk) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
A Dead-end mode operation is one of the best way to maximize the gas usage rate. But, some components of fuel cell stack like gas diffusion layer(GDL) or membrane can be damaged in dead-end mode operation. In this study, a Large Scale Polymer electrolyte membrane fuel cell(PEMFC) for a dead-end operation has been developed. The stack is composed with 4 cells which has over 400cm2 of active area. Hydrogen is used as a fuel, and oxygen is used as a oxidant. The dead-end operation performance was evaluated by a long-term dead-end mode operation. The fuel cell stack is operated over 1,500 hours in dead-end mode operating fuel cell test station. And the performance change of the fuel cell stack was investigated.