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Bi<sub>2</sub>O<sub>3</sub>를 첨가한 8M KOH용액에서 다결정 Ag전극의 전기화학적 거동
허태욱,공영경,정원섭,Hur, Tae-Uk,Kong, Yeong-Kyung,Chung, Won-Sub 한국전기화학회 2005 한국전기화학회지 Vol.8 No.1
The electrochemical behaviors of polycrystalline silver electrodes in 8M KOH solutions containing $Bi_2O_3$ were studied under various conditions by cyclic voltammetry, potentiostatic and galvanostatic techniques as well as the morphology of the silver oxide structures by SEM. It was found that three new compounds comprising silver, bismuth, and oxygen as well as $Bi_2O_3$, $Ag_2O$ and AgO were formed during the electrochemical oxidation of silver. In addition, the potentiostatic current transients were characterized by the appearances of the first current peaks corresponding to the formation of silver oxides, and the second current peaks corresponding to the Ag-Bi-O compounds, indicating the presence of the nucleation and 3D growth mechanism, in the potential regions of $Ag_2O$ and AgO, respectively. Microscopic examinations showed that two types of silver (I) oxide morphologies are formed in the potential region of $Ag_2O$.
Flare Boom Lifting Lug 구조 안정성 평가
차종국(Jongkook Cha),최주형(Joohyoung Choi),김정환(Jeonghwan Kim),허태욱(Taeuk Hur) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Flare Boom is a device to burn the waste gas and oil generated during submarine crude oil drilling. Flare Boom has become a truss structure, a length of about 30m, and the large-scale structure. Flare Boom can be installed using a crane. In this case, it runs the Lifting by fixing the four Lug Point. Lifting at the time, all of the load of Flare Boom are supported by the four Lug. therefore, structural stability evaluation of the lug is necessary. Global-Local analysis was performed to structural stability evaluation of lug. Flare Boom was simplified beam model, and Ladders, pipes, etc. was converted to weight without model. A reaction force values extracted through a global analysis. The reaction value finally been extracted global model was applied to local model to perform the structural reliability evaluation.
임종구(Lim, Jongkoo),박종철(Park, Jongcheol),고백균(Kho, Back Kyun),권기욱(Kwon, Ki Wook),신현길(Shin, Hyunkhil),허태욱(Hur, Taeuk),조성백(Cho, Sungbaek) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
캐스케이드형 연료전지 시스템에 있어서 각 스택의 단에서 전기화학반응에 의해 생성된 물을 분리하여 적절하게 배출시켜주는 것은 스택의 성능 및 내구성 향상을 위해 매우 중요하다. 이를 위해 연료전지 스택 각 단의 상이한 조건에 맞는 기액분리기의 설계가 필요하다. 유량에 따른 기액분리기의 부피와 원활한 연료 가스와 생성수의 분리를 위한 내부구조 및 입구 속도 등의 변수들에 따라 기액분리기의 성능 뿐만 아니라 연료전지 시스템 전체의 성능에 영향을 준다. 그러나 기액분리기의 폐쇄적 구조 때문에 실험을 통해 내부의 거동 및 현상을 파악할 수 없어 앞서 언급한 변수들의 효과를 확인할 수 없는 문제점이 있다. 이에 CFD(Computational Fluid Dynamics, 전산유체역학)를 활용하여 각 조건에 따른 기액분리기 내부의 현상을 파악하고 이를 통해 기액분리기 설계를 최적화하였다.
The Effects of the Inclination on the Performance of dead-end operating PEM Fuel Cell
정지훈(Jeong, Jee Hoon),고백균(Kho, Back Kyun),한인수(Han, In-Su),신현길(Shin, Hyun Khil),허태욱(Hur, Tae Uk),조성백(Cho, Sung Baek) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
In automotive applicatons or water vehicles, the polymer electrolyte membrane fuel cell(PEMFC) stack is keep moving while their operation. Especially the inclination environment can take a effect to fuel cell stack perfromance, because this condition can cause a bad effect to water exhaust of fuel cell stack. In this study, a large scale stack(over 100kW power) is inclined upto 30 degree in lengthwise and crosswise using stack lift equipment. And the stack is operated in 10~100% load. No significant change has appeared in crosswise inclined condition and lenthwise low angle. But in lenthwise large angle tilting condition, the fuel cell performance has significantly decreased. And this performance decrease is aggravated in low load. An active water exhaust device is applied to the stack to prevent the performance decrease. And in lenthwise large angle tilting condition, this device cause a good effect to fuel cell stack performance.
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.
Performance Evaluation of a Plate-Type Membrane Humidifier for PEMFC
고백균(Kho, Back Kyun),박종철(Park, JongCheol),한인수(Han, In-Su),신현길(Shin, Hyun Khil),허태욱(Hur, Tae Uk),조성백(Cho, Sungbaek) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
For optimal performance of a proton exchange membrane fuel cell (PEMFC), the membrane electrode assembly (MEA) requires hydration, and the membrane's conductivity depends on water content. A humidifier is required to ensure that the reactant gas, usually hydrogen and air, is hydrated before entering the fuel cell. Dry membrane operation or improper hydration causes performance degradation. Typically, the humidification of a fuel cell is carried out by means of an internal or external humidifier. A membrane humidifier is applied to the external humidification of transportation or residential power generation fuel cell due to its convenience and high performance. In this study, The experiments were constructed with a plate-type membrane humidifier in terms of geometric parameters and operating parameters. The results show that the temperature and pressure, the channel length, the membrane thickness and gas flow rate are critical parameters affecting the performance of the humidifier.
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.
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.
고백균(Kho, Back Kyun),박종철(Park, JongCheol),임종구(Lim, Jongkoo),권기욱(Kwon, Ki Wook),신현길(Shin, Hyun Khil),허태욱(Hur, Tae Uk),조성백(Cho, Sungbaek) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
고분자전해질연료전지(PEMFC)의 성능은 고분자막의 이온전도도에 따라 큰 영향을 받으며 가습조건에 따라 연료의 수화정도에 비례하여 증가하는 경향을 보인다. 현재 고분자막을 가습하는 방법에는 여러 가지가 있는데, PEMFC에 많이 사용되고 있는 Bubbler 형태의 가습장치는 고온이 필요하며 가습 효율이 수동적인 단점을 가지고 있다. 이에 비해서 막을 이용한 가습방법은 스택의 냉각시스템을 이용하여 가습 시, 별도의 에너지가 필요하지 않다. 이에 본 연구에서는 비교적 저온에서도 가습 효율이 증대하고 시스템 간소화의 장점을 가진 막가습기를 제작하여 고분자전해질 연료전지에서 열 및 습도조절에 대한 효율성을 비교 연구하였다. 막가습기에 사용된 가습막의 두께에 따른 가습도 변화 및 유로 구조에 따른 압력강화를 관찰하였으며 막가습기를 판형 모듈 형태로 제작하여 고분자전해질연료전지에 적용하여 성능을 평가하였다.