• Title, Summary, Keyword: Polymer electrolyte membrane

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Preparation and Characterization of Proton Conducting Membranes by Blending PVC-g-PHEA and PVA

  • Koh, Jong-Kwan;Choi, Jin-Kyu;Seo, Jin-Ah;Zeng, Xiaolei;Kim, Jong-Hak
    • Korean Membrane Journal
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    • v.11 no.1
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    • pp.1-7
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    • 2009
  • This work reports the preparation of proton conductive crosslinked polymer electrolyte membranes by blending poly(vinyl chloride)-g-poly(hydroxyl ethyl acrylate) (PVC-g-PHEA) and poly(vinyl alcohol) (PVA). The PHEA chains of the graft copolymer were crosslinked with PVA using sulfosuccinic acid (SA) via the esterification reaction between -OH of polymer matrix and -COOH of SA. The PVC-g-PHEA graft copolymer was synthesized via atom transfer radical polymerization (ATRP) using direct initiation of the secondary chlorines of PVC backbones. Ion exchange capacity (IEC) continuously increased with increasing concentrations of SA, due to the increasing portion of charged groups in the membrane. However, the water uptake increased up to 20.0 wt% of SA concentration above which it decreased monotonically. The membrane exhibited a maximum proton conductivity of 0.026 S/cm at 20.0 wt% of SA concentration, which is presumably due to competitive effect between the increase of ionic sites and the crosslinking reaction.

Hydrogen Transport through Palladium Foil Placed in Nafion Electrolyte of H2/O2 Fuel Cellsorption

  • Song, Seong-Min;Koo, Il-Gyo;Lee, Woong-Moo
    • Transactions of the Korean hydrogen and new energy society
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    • v.12 no.4
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    • pp.257-265
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    • 2001
  • Placing a hydrogen conducting, methanol impermeable metallic barrier like palladium (Pd) is a well-known method for preventing methanol crossover through solid polymer electrolyte for direct methanol fuel cells (DMFC). Applying a bias potential between the anode and the barrier can further develop this concept so that the hydrogen transfer rate is enhanced. Since hydrogen diffuses in Pd as atomic form while it moves through nafion electrolyte as ion, it has to be reduced or oxidized whenever it passes the interface formed by Pd and the electrolyte. We performed experiments to measure the hydrogen transport through the Pd membrane placed in Nafion electrolyte of hydrogen/oxygen fuel cell (PEMFC). Applying a bias potential between the hydrogen electrode of the cell and the Pd membrane facilitated the hydrogen passage through the Pd membrane. The results show that the cell current measured with the Pd membrane placed reached almost 40 % the value measured with the cell without Pd membrane. It was found that the current flown through the bias path is only a few percent of the cell current.

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Recent advances in Studies of the Activity of Non-precious Metal Catalysts for the Oxygen Reduction Reaction in Polymer Electrolyte Membrane Fuel Cells (고분자 전해질 연료전지용 산소환원반응을 위한 비백금촉매의 활성에 대한 최신 연구 동향)

  • Yoon, Ho-Seok;Jung, Won Suk;Choe, Myeong-Ho
    • Journal of the Korean Electrochemical Society
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    • v.23 no.4
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    • pp.90-96
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    • 2020
  • Polymer electrolyte membrane fuel cells, which convert the chemical reaction energy of hydrogen into electric power directly, are a type of eco-friendly power for future vehicles. Due to the sluggish oxygen reduction reaction and costly Pt catalyst in the cathode, the research related to the replacement of Pt-based catalysts has been vitally carried out. In this case, however, the performance is significantly different from each other and a variety of factors have existed. In this review paper, we rearrange and summarize relevant papers published within 5 years approximately. The selection of precursors, synthesis method, and co-catalyst are represented as a core factor, while the necessity of research for the further enhancement of activity may be raised. It can be anticipated to contribute to the replacement of precious metal catalysts in the various fields of study. The final objective of the future research is depicted in detail.

Analysis of Thermal Effect by Coolant Plate Number in High-Temperature Polymer Electrolyte Membrane Fuel Cell Stack (고온형 고분자 전해질 연료전지 스택 내부의 냉각판 수가 스택에 미치는 열 영향성의 수치적 연구)

  • Choi, Byung Wook;Ju, Hyun Chul
    • Transactions of the Korean hydrogen and new energy society
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    • v.26 no.2
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    • pp.127-135
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    • 2015
  • High-Temperautre Polymer Electrolyte Membrane Fuel Cell (HT-PEMFC) with phosphoric acid-doped polybenzimidazole (PBI) membrane has high power density because of high operating temperature from 100 to $200^{\circ}C$. In fuel cell stack, heat is generated by electrochemical reaction and high operating temperature makes a lot of heat. This heat is caouse of durability and performance decrease about stack. For these reasons, heat management is important in HT-PEMFC. So, we developed HT-PEMFC model and study heat flow in HT-PEMFC stack. In this study, we placed coolant plate number per cell number ratio as variable and analysed heat flow distribution in stack.

Activation of polymer electrolyte membrane fuel cells (고분자 전해질 연료전지의 활성화)

  • Ko, Jae-Jun;Ko, Haeng-Jin;Song, Min-Kyu;Yang, Yu-Chang;Lee, Jong-Hyun
    • New & Renewable Energy
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    • v.1 no.2
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    • pp.34-40
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    • 2005
  • 고분자 전해질막 연료전지는 운전시 정상적인 성능을 발현하기 위해서 전지 본체 조립 후 초기 활성화 운전이 필요하다. 이러한 활성화 운전을 통해 전해질 사이의 수소이온이동 통로, 반응가스가 반응할 수 있는 촉매까지의 이동 통로, 촉매층내의 전기적 연속성을 확보함으로 연료전지는 최적의 성능을 나타낼 수 있다. 본 연구를 통해 연료전지 활성화에 영향을 미치는 요인을 찾았고, 이를 통해 효과적이고 빠른 활성화 절차에 관한 연구를 수행하였다.

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The Characteristic of Prepared Electrode Catalyst and MEA using CNF and CNT (CNT 및 CNF를 이용하여 제조된 전극 촉매 및 막 전극 접합체의 특성)

  • 임재욱;최대규;류호진
    • Journal of the Microelectronics and Packaging Society
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    • v.11 no.1
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    • pp.59-64
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    • 2004
  • The performance of fuel cell electrode depends on the characteristics of the catalyst support material. This paper deals with the use of CNF(carbon nanofibre) and CNT(carbon nanotube) as platinum catalyst support. The CNF and CNT were synthesized with catalyst treated by mechanochemical process and were prepared by chemical vapor deposition (CVD) method. The platinum supported on CNF and CNT for polymer electrolyte membrane fuel cell (PEMFC) application. In result, the best I-V characteristic was verified by the prepared MEA(membrane electrode assembly) from twisted CNF that had a diameter of 65 nm.

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Activation of polymer electrolyte membrane fuel cells (고분자 전해질 연료전지의 활성화)

  • Ko, Jae-Jun;Ko, Haeng-Jin;Song, Min-Kyu;Yang, Yu-Chang;Lee, Jong-Hyun
    • 한국신재생에너지학회:학술대회논문집
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    • pp.330-334
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    • 2005
  • 고분자 전해질막 연료전지는 운전시 정상적인 성능을 발현하기 이해서 전지 본체 조립 후 초기 활성화 운전이 필요하다. 이러한 활성화 운전을 통해 전해질 사이의 수소이온이동 통로, 반응가스가 반응할 수 있는 촉매까지의 이동 통로, 촉매층내의 전기적 연속성을 확보함으로 연료전지는 최적의 성능을 나타낼 수 있다. 본 연구를 통해 연료전지 활성화에 영향을 미치는 요인을 찾았고, 이를 통해 효과적이고 빠른 활성화 절차에 관한 연구를 수행하였다.

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Effect of Pt amount in the Pt/C for cathode catalyst on the performance of PEMFC (고분자전해질 연료전지의 환원전극 백금 담지촉매의 백금 담지비에 따른 성능변화)

  • Cho, Yong-Hun;Cho, Yoon-Hwan;Park, Hyun-Seo;Sung, Yung-Eun
    • 한국신재생에너지학회:학술대회논문집
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    • pp.107-109
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    • 2006
  • This study focuses on a determination of amount of Pt in the Pt/C for catalysts of polymer electrolyte membrane fuel cells (PEMFC). PEMFC offer low weight and high power density and being considered for automotive and stationary power applications. The PEMFC performance is influenced by several factors, including catalysts and structure of electrode and membrane type. Catalyst of electrode is important factor for PEMFC. One of the obstacles prevent ing polymer electrolyte membrane fuel cells from commercialization is the high cost of noble metals to be used as catalyst, such as platinum To effectively use these metals, they have to be will dispersed to small particles on conductive carbon supports. The optimal amount of Pt in Pt/C for cathode catalyst was investigated by using polarization curves in single cell with $H_2/O_2$ operation.

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PEMFC Operation Connected with Methanol Reformer System

  • Lee, Jung-Hyun;Park, Sang-Sun;Shul, Yong-Gun;Park, Jong-Man;Kim, Dong-Hyun;Kim, Ha-Suck;Yoo, Seung-Eul
    • Carbon letters
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    • v.9 no.4
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    • pp.303-307
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    • 2008
  • The studies on integrated operation of fuel cell with fuel processor are very essential prior to its commercialization. In this study, Polymer Electrolyte Membrane Fuel Cell (PEMFC) was operated with a fuel processor, which is mainly composed of two parts, methanol steam reforming reaction and preferential oxidation (PROX). In fuel processor, ICI 33-5 (CuO 50%, ZnO 33%, $Al_2O_3$ 8%, BET surface area: $66\;m^2g^{-1}$) catalyst and CuO-$CeO_2$ catalyst were used for methanol steam reforming, preferential oxidation (PROX) respectively. PEMFC was operated by hydrogen fuel generated from fuel processor. The resulting gas from PROX reactor is used to operate PEMFC equipped with our prepared anode and cathode catalyst. PtRu/C catalyst gives more tolerance to CO.