• 한국수소및신에너지학회논문집
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• 제27권6호
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• pp.670-676
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• 2016

Hydrogen town in Republic of Korea was established in 2013. Hydrogen as a byproduct produced by various processes of factories is used in hydrogen town facilities. As cell performance is affected by contaminations in fuel gas, various standards about impurities of fuel have been determined by many countries. This study shows performance degradation of single cell with impurities concentrations. Traces of carbon monoxide (CO) and hydrogen sulfide ($H_2S$)can cause considerable cell performance losses. For comparing the performances by poisoning of CO, acceleration test, I-V curve, constant current are performed. Both the CO and $H_2S$ poisoning rate are a function of their concentration. With the higher concentrations the higher poisoning rates are observed. And, it was confirmed that, oxidation behavior and side reaction generation are not affected. Under the lower $H_2S$ concentration condition, the poisoning rate is much higher than that of CO because of its different adsorption intensity. It can be possible that the result of this study can be used for enacting regulation as a baseline data.

• 멤브레인
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• 제13권1호
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• pp.47-53
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• 2003

Poly(ether ether ketone)(PEEK)를 황산을 사용하여 설폰화시킨 후 폴리설폰과 다양한 조성으로 혼합하여 블렌드 고분자 전해질 막을 제조하였고 조성의 변화에 따른 메탄을 투과도, 수소이온전도도, 그리고 이온교환용량의 변화를 측정하였다. 폴리설폰의 경우 이온전도도는 낮은 반면에 메탄올에 대한 저항은 우수하였다. 그러나, 설폰화된 PEEK의 양이 증가함에 따라 메탄을 투과도와 수소이온전도도가 함께 증가하였다. 이온전도도와 메탄을 투과도의 비로부터 폴리설폰의 양이 20%일 때 가장 좋은 선택성을 가지는 것을 알 수 있었다.

• 폴리머
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• 제34권3호
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• pp.202-209
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• 2010

열적 안정성과 기계적 강도에서 우수한 장점을 지니고 있는 메타계 aramid segment와 제막 특성이 우수하고 내가수분해성이 우수한 sulfone segment로 이루어진 공중합체를 이용하여 연료 전지용 막으로서의 응용가능성을 연구하였다. 아라미드 고분자의 solubility와 processability를 향상시키기 위해 아민기를 갖는 sulfonated ether sulfone단량체와 m-phenylene diamine 그리고 isophthaloyl chloride를 반응시켜 아민으로 말단화된 랜덤공중합체를 합성하고 이것을 acryloyl chloride와 반응시켜 양 말단에 2중 결합이 도입된 고분자전구체를 합성하였다. 얻어진 고분자전구체는 열 가교를 통해 고분자 전해질 막으로 제조되었으며, 전구체의 합성을 비롯한 각 단계의 반응은 $^1H$ NMR, FTIR, 및 적정에 의하여 확인되었다. 얻어진 전해질막은 이온교환용량과 함수율, 수소이온전도도, 열적 특성 등이 측정되었으며, sulfonated ether sulfone 단량체의 함유량이 증가할수록 이온교환용량, 함수율, 수소이온전도도가 증가하는 것이 관찰되었다. Sulfonic acid sulfone segment를 30 몰%로 갖는 고분자 전해질 막의 경우 이온교환용량이 1.57 meq/g, 함수율은 44 wt% 이하의 수치를 보였으며, 가장 높은 수소이온전도도의 값은 상대습도 100%, $25^{\circ}C$에서 $3.93{\times}10^{-2}S/cm$이었다.

• 폴리머
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• 제35권2호
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• pp.106-112
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• 2011

열적 안정성과 기계적 강도에서 우수한 장점을 지니고 있는 파라계 aramid 세그먼트와 제막 특성이 우수하고 내 가수분해성이 우수한 sulfone 세그먼트로 이루어진 공중합체를 이용하여 연료 전지용 막으로써의 응용가능성을 연구하였다. 아라미드 고분자의 용해도를 향상시키기 위해 아민기를 갖는 sulfonated ether sulfone 단량체와 p-phenylene diamine 그리고 terephthaloyl chloride를 일정한 순서로 반응시켜 아민으로 말단화된 공중합체를 합성하고 이것을 epoxy group을 함유하고 있는 trimethylolpropane triglycidyl ether(TMPTGE)와 열 가교를 통해 고분자 전해절막으로 제조되었으며, 전구체의 합성을 비롯한 각 단계의 반응은 $^lH$ NMR, FTIR, 및 적정에 의하여 확인되었다. 얻어진 전해질막은 이온교환용량과 함수율, 수소이온전도도 등이 측정되었으며 sulfonated ether sulfone 단량체의 함유량이 증가할수록 이온교환용량, 함수율, 수소이온전도도가 증가하는 것이 관찰되었다. Sulfonic acid sulfone 세그먼트를 60 몰%로 갖는 고분자 전해질막의 경우 이온교환용량이 1.88 meq/g, 함수율은 110wt% 이하의 수치를 보였으며, 가장 높은 수소이온전도도의 값은 상대습도 100%, $25^{\circ}C$에서 $7.4{\times}10^{-2}$ S/cm이었다.

• 한국태양에너지학회 논문집
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• 제32권spc3호
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• pp.282-288
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• 2012

Proton exchange membrane fuel cell (PEMFC) is the most promising energy source for the robot applications because it has unique advantages such as high energy density, no power drop during operating, and easy to make compact size. However, PEMFC has intrinsic disadvantages which are delay to start up and difficulty to correspond drastic load changes. These disadvantages can be compensated by hybrid operating with a Li-poly battery. This study is focus to build and understand the hybrid system for the robot system. In this study, we build the PEMFC hybrid system using EOS-320 PEMFC stack, Li-poly battery and G-Philos FDX1-250BU dc-dc converter. The hybrid system is accurately monitored by CAN and RS485. The system was studied under two conditions such as non-loaded and loaded operating conditions. The results show that the system has delay to start up without hybrid operating and it can be compensated with the hybrid operating.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2012년도 춘계학술발표대회 논문집
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• pp.229-233
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• 2012

Proton exchange membrane fuel cell (PEMFC) is the most promising energy source for the robot applications because it has unique advantages such as high energy density, no power drop during operating, and easy to make compact size. However, PEMFC has intrinsic disadvantages which are delay to start up and difficulty to correspond drastic load changes. These disadvantages can be compensated by hybrid operating with a Li-poly battery. This study is focus to build and understand the hybrid system for the robot system. In this study, we build the PEMFC hybrid system using EOS-320 PEMFC stack, Li-poly battery and G-Philos FDX1-250BU dc-dc converter. The hybrid system is accurately monitored by CAN and RS485. The system was studied under two conditions such as non-loaded and loaded operating conditions. The results show that the system has delay to start up without hybrid operating and it can be compensated with the hybrid operating.

• 한국수소및신에너지학회논문집
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• 제22권6호
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• pp.819-826
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• 2011

The proton exchange membrane fuel cell (PEMFC) is regarded as the most promising alternative power sources for unmanned aerial vehicle (UAV) due to its high energy density and silent operation. Since there are many load changes during UAV flight, thermal management is one of the important factor for the performance of PEMFC. In order to reduce the UAV weight for the stable operation of UAV, thermal management system (TMS) studied in this work does not use the fan but use the air flowing into UAV by UAV flight. In order to develop the passive type heat exchanger (HEX) for 1kW PEMFC, four types of HEXs are fabricated and their cooling performances are compared. The parametric study on the cooling performance of HEXs has performed with the variation of operating parameters such as mass flow rates and inlet temperature of air and coolant. Type 4 has the best performance in every case. This study can be helpful to achieve the optimal design of HEX for PEMFC powered UAV.

• 멤브레인
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• 제14권2호
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• pp.117-125
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• 2004

본 연구는 직접메탄을 연료전지(Direct Methanol Fuel Cell)에 적용가능한 양이온교환막 개발에 관한 것으로 PVA/PAM/ZrP 막을 제조하여 PAM, ZrP의 함량 및 농도 변화에 따른 막의 특성을 연구하였다. PVA/PAM/ZrP 막은 PVA에 가교제인 PAM의 함량을 7∼11 wt%로 증가시켜 제조하였으며 그 각각의 막에 8$0^{\circ}C$에서 zirconyl chloride와 Phosphoric acid solution에 침적시켜 제조하였다. ZrP의 농도를 1, 2 M로 변화시켜 메탄을 투과도, 이온전도도, 함수율 및 이온교환용량을 측정하였다. PVA/PAM/ZrP 막의 메탄올 투과도는 10/^{-8}∼l0^{-6}$ $\textrm{cm}^2$/sec, 이온전도도는 $10^{-3}~10^{-2}$ S/cm 정도 나타내었으며 함수율은 0.26∼l.17 g $H_2O$/g membrane, 이온교환용량은 2.59∼5.1 meq/g membrane의 결과를 보였는데 이는 PVA/PAM 막과 비교하여 메탄을 투과도, 이온전도도는 각각 18%, 23% 정도 증가한 것으로 관찰되었다.

• 전기학회논문지P
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• 제58권4호
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• pp.592-596
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• 2009

DAFC(direct alcohol fuel cell) takes the same structure and operational principle with PEMFC(Proton exchange membrane fuel cell). However, DAFC, which uses liquid alcohol instead of hydrogen as fuel, is able to be used as a portable power for small-scaled electronic devices such as MP3, PMP, and mobile phone because alcohol is quite convenient steady-state compound to carry and store it. This paper presents the OCV(open circuit voltage) characteristics of the cases which are alcohol species and different weight rate of ethanol, respectively. The OCV of methanol fuel cell is slightly higher 0.2V than ethanol one, and 8% wt. rate ethanol is rated as the most appropriate fuel for DAFC.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2011년도 추계학술발표대회 논문집
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• pp.270-273
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• 2011

Water management is important in proton exchange membrane fuel cell because the water balance has a significant impact on the overall fuel cell system performance. In fuel cell vehicle, the vehicle's power demand is dynamic; therefore, the dynamic water management system is required. This present study proposes a method to control the humidity of the input air in cathode side of the fuel cell vehicle. The simulation using several driving cycles shows the proposed air humidification control obtains a relatively good result. The liquid saturation level is seen constant at the target level although still there are small deviations at driving cycles which having averagely high power demands.