• 제목, 요약, 키워드: Polymer electrolyte membrane

검색결과 551건 처리시간 0.05초

올레핀 촉진수송용 고분자 전해질막의 내구성에 대한 Brij98의 효과 (Effect of Brij98 on Durability of Silver Polymer Electrolyte Membranes for Facilitated Olefin Transport)

  • 강용수;김종학;박혜헌;원종옥
    • 멤브레인
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    • v.16 no.4
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    • pp.294-302
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    • 2006
  • 은 고분자 전해질은 올레핀/파리핀 혼합물 분리에 매우 효과적인 분리막 재료이다. 이는 고분자 매질속에 녹아 있는 은이온이 올레핀과 선택적, 가역적 반응을 통해 올레핀만을 분리막속으로 통과시키기 때문이다. 그러나 이러한 은 고분자 전해질 분리막은 실제 공정에 응용되기에는 다소 약한 장시간 운전 성능 안정성을 보인다. 즉 분리 성능이 시간이 지남에 따라 점차 감소되는데 이는 은이온이 은 나노입자로 환원되기 때문이다. 따라서 본 연구에서는 poly(vinyl pyrrolidone) (PVP)와 $AgBF_4$로 이루어진 고분자 전해질막의 안정성을 향상시키고자 비이온 계면활성제인 $C_{18}H_{35}(OCH_2CH_2)_{20}OH$ (Brij98)를 첨가제로 사용하였다. 분리막속에서 은이온의 은 나노입자로의 환원현상을 원자전자 현미경과 자외선 분광학을 이용하여 분석하였다. 그 결과 Brij98이 첨가된 분리막의 경우 은 나노입자의 성장이 늦춰졌으며, 프로판/프로핀렌 선택도가 장시간 유지됨을 알 수 있었다.

염료감응 태양전지용 고분자 전해질막의 총설 (Review on Polymer Electrolyte Membranes for Dye-sensitized Solar Cells)

  • 이재훈;박철훈;이창수;김종학
    • 멤브레인
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    • v.29 no.2
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    • pp.80-87
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    • 2019
  • 염료감응형 태양전지는 지속 가능한 에너지원으로서 많은 관심을 받고 있다. 염료감응형 태양전지의 효율과 장기 안정성은 전극 물질과 전해질에 의해 크게 영향을 받는데 본 총설에서는 전해질에 초점을 두어 서술하고자 한다. 고분자 전해질막은 염료감응형 태양전지에서 기존의 액체 전해질을 대체하기 위한 대안으로 제시되어 왔다. 기존의 액체 전해질은 높은 효율을 나타낼 수 있지만 장기적인 안정성 문제와 누액 문제로 인해 고분자 전해질막에 관한 관심은 지속적으로 증가하고 있으며 매년 이와 관련된 논문들이 활발히 보고되고 있다. 본 총설은 염료감응형 태양전지를 위한 고분자 전해질막의 개념과 개발에 대한 간단한 설명을 다루고 있으며 고분자 매트릭스의 개질, 유-무기 가소제 및 이온성 액체와 같은 첨가제의 도입에 따른 염료감응형 태양전지의 효율과 전기화학적 특성에 대해서도 최근의 연구들이 정리되어 있다.

Investigation of Water Transport in Newly Developed Micro Porous Layers for Polymer Electrolyte Membrane Fuel Cells

  • Alrwashdeh, Saad S.;Markotter, Henning;Haussmann, Jan;Hilger, Andre;Klages, Merle;Muller, Bernd R.;Kupsch, Andreas;Riesemeier, Heinrich;Scholta, Joachim;Manke, Ingo
    • Applied Microscopy
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    • v.47 no.3
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    • pp.101-104
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    • 2017
  • In this investigation, synchrotron X-ray imaging was used to investigate the water distribution inside newly developed gas diffusion media in polymer electrolyte membrane fuel cells. In-situ radiography was used to reveal the relationship between the structure of the microporous layer (MPL) and the water flow in a newly developed MPL equipped with randomly arranged holes. A strong influence of these holes on the overall water transport was found. This contribution provides a brief overview to some of our recent activities on this research field.

고분자 연료전지의 다공성층 내에서의 액상수분 이동에 관한 공극-네트워크 해석 연구 (Pore-network Study of Liquid Water Transport through Multiple Gas Diffusion Medium in PEMFCs)

  • 강정호;이상건;남진현;김찬중
    • 한국전산유체공학회:학술대회논문집
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    • pp.46-53
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    • 2011
  • Water is continuously produced in polymer electrolyte membrane fuel cell (PEMFC), and is transported and exhausted through polymer electrolyte membrane (PEM), catalyst layer (CL), microporous layer (MPL), and gas diffusion layer (GDL). The low operation temperatures of PEMFC lead to the condensation of water, and the condensed water hinders the transport of reactants in porous layers (MPL and GDL). Thus, water flooding is currently one of hot issues that should be solved to achieve higher performance of PEMFC. This research aims to study liquid water transport in porous layers of PEMFC by using pore-network model, while the microscale pore structure and hydrophilic/hydrophobic surface properties of GDL and MPL were fully considered.

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교류 임피던스 측정법을 이용한 고분자 전해질 연료전지의 성능특성 분석 (Performance Analysis of Polymer Electrolyte Membrane Fuel Cell by AC Impedance Measurement)

  • 서상헌;이창식
    • 한국수소및신에너지학회논문집
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    • v.20 no.4
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    • pp.283-290
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    • 2009
  • This study focuses on the performance characteristics of polymer electrolyte membrane fuel cell (PEMFC) using the AC impedance technique. The experiment was carried out to investigate the optimal operating conditions of PEMFC such as cell temperature, flow rate, humidified temperature and back-pressure. The fuel cell performance was analyzed by DC electronic-loader with constant voltage mode and expressed by voltage-current density. Additionally, AC impedance was measured to analysis of ohmic and activation loss and expressed by Nyquist plot. The results showed that the cell performance increased with increase of cell temperature, air flow rate, humidified temperature and backpressure. Also, the activation loss decreased as the increase of cell temperature, air flow rate, humidified temperature and backpressure.

The Effect of Annealing on sSEBS/Polyrotaxanes Electrolyte Membranes for Direct Methanol Fuel Cells

  • Won, Jong-Ok;Cho, Hyun-Dong;Kang, Yong-Soo
    • Macromolecular research
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    • v.17 no.10
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    • pp.729-733
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    • 2009
  • Solution casting films of sulfonated poly[styrene-b-(ethylene-r-butylene)-b-styrene] copolymer (sSEBS)-based composite membranes that contained different amounts of organic, nanorod-shaped polyrotaxane were annealed at various temperatures for 1 h. The films' properties were characterized with respect to their use as polymer electrolyte membranes in direct methanol fuel cells (DMFCs). Different aspect ratios of polyrotaxane were prepared using the inclusion-complex reaction between $\alpha$-cyclodextrin and poly(ethylene glycol). The presence of the organic polyrotaxane inside the membrane changed the morphology during the membrane preparation and reduced the transport of methanol. The conductivity and methanol permeability of the composite membranes decreased with increasing polyrotaxane content, while the annealing temperature increased. All of the sSEBS-based, polyrotaxane composite membranes annealed at $140^{\circ}C$ showed a higher selectivity parameter, suggesting their potential usage for DMFCs.

가정용 고분자 전해질 연료전지 시스템의 적용에 관한 연구 (A study on the application of Residential Polymer Electrolyte Membrane Fuel Cell)

  • 이철기;김주영;홍원화
    • 한국주거학회:학술대회논문집
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    • pp.315-318
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    • 2005
  • One of the problems in using renewable energy sources is great difficulty of stable and sustainable supply. Because the fuel cell can provide stable and sustainable supply of energy sources without regard to external conditions, however, it will become one of the most useful renewable energy sources for buildings that need stable energy supply. For practical application of PEMFC system to common household, the data of household energy consumption are analyzed by electricity, cooking and heating. From the result of the data analysis, practical application methods of PEMFC system to household are designed to several models. The aim of this study is to establish a plan of practical application for applying Polymer Electrolyte Membrane Fuel Cell(PEMFC) system to the households.

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Polymer Electrolyte Membranes and their Applications to Membranes, Fuel Cells and Solar Cells

  • Kang, Yong-Soo
    • 한국막학회:학술대회논문집
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    • pp.29-32
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    • 2003
  • Polymer electrolyte membranes are developed for the applications to facilitated transport membranes, fuel cells and solar cells. The polymer electrolyte membranes containing silver salt show the remarkably high separation performance for olefin/paraffin mixture in the solid state; the propylene permeance is 45 GPU and the ideal selectivity of propylene/propane is 15,000. For fuel cell membranes, the effects of the presence and size of the proton transport channels on the proton conductivity and methanol permeability were investigated. The cell performance for dye-sensitized solar cells employing polymer electrolytes are measured under light illumination. The overall energy conversion efficiency reaches 5.44 % at 10 ㎽/$\textrm{cm}^2$, to our knowledge the highest value ever reported in the polymer electrolytes.

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Characterization of DNA/Poly(ethylene imine) Electrolyte Membranes

  • Park, Jin-Kyoung;Won, Jong-Ok;Kim, Chan-Kyung
    • Macromolecular research
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    • v.15 no.6
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    • pp.581-586
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    • 2007
  • Cast DNA/polyethyleneimine (PEI) blend membranes containing different amounts of DNA were prepared using acid-base interaction and characterized with the aim of understanding the polymer electrolyte membrane properties. Two different molecular weights of PEI were used to provide the mechanical strength, while DNA, a polyelectrolyte, was used for the proton transport channel. Proton conductivity was observed for the DNA/PEI membrane and reached approximately $3.0{\times}10^{-3}S/cm$ for a DNA loading of 16 wt% at $80^{\circ}C$. The proton transport phenomena of the DNA/PEI complexes were investigated in terms of the complexation energy using the density functional theory method. In the case of DNA/PEI, a cisoid-type complex was more favorable for both the formation of the complex and the dissociation of hydrogen from the phosphate. Since the main requirement for proton transport in the polymer matrix is to dissociate the hydrogen from its ionic sites, this suggests the significant role played by the basicity of the matrix.

Decrease in hydrogen crossover through membrane of polymer electrolyte membrane fuel cells at the initial stages of an acceleration stress test

  • Hwang, Byung Chan;Oh, So Hyeong;Lee, Moo Seok;Lee, Dong Hoon;Park, Kwon Pil
    • The Korean Journal of Chemical Engineering
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    • v.35 no.11
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    • pp.2290-2295
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    • 2018
  • An acceleration stress test (AST) was performed to evaluate the durability of a polymer membrane in a polymer electrolyte membrane fuel cell (PEMFC) for 500 hours. Previous studies have shown that hydrogen crossover measured by linear sweep voltammetry (LSV) increases when the polymer membrane deteriorates in the AST process. On the other hand, hydrogen crossover of the membrane often decreases in the early stages of the AST test. To investigate the cause of this phenomenon, we analyzed the MEA operated for 50 hours using the AST method (OCV, RH 30% and $90^{\circ}C$). Cyclic voltammetry and transmission electron showed that the electrochemical surface area (ECSA) decreased due to the growth of electrode catalyst particles and that the hydrogen crossover current density measured by LSV could be reduced. Fourier transform infrared spectroscopy and thermogravimetric/differential thermal analysis showed that -S-O-S- crosslinking occurred in the polymer after the 50 hour AST. Gas chromatography showed that the hydrogen permeability was decreased by -S-O-S- crosslinking. The reduction of the hydrogen crossover current density measured by LSV in the early stages of AST could be caused by both reduction of the electrochemical surface area of the electrode catalyst and -S-O-S- crosslinking.