• 제목, 요약, 키워드: Proton conductivity

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고분자 전해질 연료전지용 유.무기 복합막의 연구개발동향 (Research Trend of Organic/Inorganic Composite Membrane for Polymer Electrolyte Membrane Fuel Cell)

  • 김득주;남상용
    • 멤브레인
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    • v.22 no.3
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    • pp.155-170
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    • 2012
  • 연료전지는 석유엔진과 비교하여 높은 전류밀도와 효율성, 그리고 친환경적이기 때문에 21세기 들어 대체 발전시스템으로서 각광받아왔다. 연료전지 시스템에서 고분자 전해질 막은 핵심부품으로써 현재 Nafion막이 연료전지시스템에서 사용 중이지만 높은 제조단가와 고온에서 낮은 전도도를 가지는 단점을 가지고 있다. 그러므로 많은 학자들이 낮은 제조단가, 높은 물리적 특성들을 달성하기 위한 연구를 진행하여 왔으며 연료전지의 상용화와 동시에 고성능의 연료전지의 개발을 위하여 많은 방법들이 개발되어 왔다. 그중, 유무기 복합막은 유기물과 무기물의 물성을 균일하게 조합할 수 있으므로 잠재성을 가지고 있는 제조방법이다. 본고에서는 다양한 무기물이 사용되어 제조된 유무기 복합막의 연구동향에 대하여 조사하였다.

PEMFC용 Ferroxane-나피온 복합막의 제조 및 특성분석 (Preparation and Characterizations of Ferroxane-Nafion Composite Membranes for PEMFC)

  • 신문식;오규현;박진수
    • 멤브레인
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    • v.26 no.2
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    • pp.135-140
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    • 2016
  • 본 연구에서는 고분자전해질 연료전지의 전해질막의 성능향상을 위하여 철산화물(Ferroxane)과 나피온을 이용하여 유무기 복합막을 개발하였다. 아세트산을 이용하여 안정화시킨 lepidocrocite을 이용한 ferroxane 나노입자를 합성하였고, 이를 나피온과 혼합하여 복합막들을 제조하였다. 제조된 복합막들의 성능 및 열안정성을 평가하기 위해 이온전도도, 이온교환용량(IEC), 함수율 및 TGA 측정을 수행하였다. 그 결과 ferroxane 나노입자를 함유한 나피온 복합막의 수소이온전도도가 리캐스팅한 나피온막보다 높은 이온전도도 및 이온교환용량을 보였으며, 높은 열적 안정성 결과를 얻었다. 최고 성능의 복합막의 수소이온전도도는 $0.09S\;cm^{-1}$이며, 이온교환용량은 $0.906meq\;g^{-1}$을 보였다.

고온 연료전지용 새로운 형태의 고분자 전해질막의 합성과 특성연구 (Synthesis and Properties of New Type of Proton Conducting Polymer Membrane for High Temperature Fuel Cells)

  • 이중희;삼부 바드라;김남훈;이홍기;김홍건
    • 한국신재생에너지학회:학술대회논문집
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    • pp.166-169
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    • 2009
  • Poly(benzimidazole-co-aniline) (PBIANI), a self-crosslinked, net-structured, proton conducting polymer has been synthesized for the membrane of high temperature proton exchange membrane fuel cells (HT-PEMFC) with improved proton conductivity and mechanical strength. The stress at break (26$\pm$3MPa)and proton conductivity (167 mS cm-1)of the phosphoric acid doped PBIANI (DPBIANI)membrane is much higher than those of other doped polybenzimidazole(PBI) type membranes.

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Current Sensing Atomic Force Microscopy를 이용한 PEM의 수화 현상에 따른 모폴로지 변화 연구 (Current Sensing Atomic Force Microscopy Study of the Morphological Variation of Hydrated Pronton Exchange Membrane)

  • 권오성;이상철;손병락;이동하
    • 한국태양에너지학회 논문집
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    • v.34 no.4
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    • pp.9-16
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    • 2014
  • A proton exchange membrane is a core component in the proton exchange membrane fuel cell because the role of proton exchange membrane(PEM)is supplying proton conductivity to fuel cell, a gas separator, and insulating between an anode and cathode. Among various role of PEM, supplying proton conductivity is the most important and the proton conductivity is strongly related the structural evolution of PEM by hydration. Thus a lot of studies have done by past few decade based on small angle X-ray scattering and wide angle X-ray scattering for understanding morphological structure of the PEM. Resulting from these studies, several morphological models of hydrated PEM are proposed. Current sensing atomic force microscopy (CSAFM) can map morphology and conductance on the membrane simultaneously. It can be the best tool for studying heterogenous structured materials such as PEM. In this study, the hydration of the membrane is examined by using CSAFM. Conductance and morphological images are simultaneously mapped under different relative humidity. The conductance images, which are mapped from different relative humidity, are analyzed by statistical methode for understanding ionic channel variation in PEM.

BaZr0.85-xPdxY0.15O3-δ/ Carbonates 복합전도체 전기적 특성 연구 (Study of Electrical Conductivity of BaZr0.85-xPdxY0.15O3-δ/ Carbonates Composite Materials)

  • 박가영;백승석;박준영
    • 한국세라믹학회지
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    • v.51 no.4
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    • pp.283-288
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    • 2014
  • PdO-doped $BaZr_{0.85}Y_{0.15}O_{3-\delta}$ (BZPY) proton conductors have been proposed as applicable for intermediate temperature electrolytes for protonic ceramic fuel cells (PCFCs) because the PdO doping is effective for improving the proton conductivity of $BaZr_{0.85}Y_{0.15}O_{3-\delta}$ (BZY) with high affinity for hydrogen. In order to further improve the conductivity of BZPY, two-phase composite electrolytes consisting of a BZPY and molten carbonate were designed. Dense BZPY-based composite electrolytes were fabricated after sintering at $670^{\circ}C$ for 4 h, since molten carbonates fill the grain boundary of the porous BZPY matrix. Furthermore, BZPY/$(Li-0.5Na)_2CO_3$ composites show a significantly enhanced protonic conductivity at intermediate temperatures. This may be because easy proton transport is possible through the interface of the carbonate and oxide phase.

Preparation and Characterization of Composite Membrane for Low Temperature Direct Methanol Fuel Cells

  • Huang Sheng-Jian;Lee Hoi-Kwan;Kang Won-Ho;Wu Qing
    • 마이크로전자및패키징학회지
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    • v.11 no.4
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    • pp.69-73
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    • 2004
  • A series of $H_3PO_4$-doped composite membranes based on poly(vinyl alcohol)(PVA) and silica have been prepared by sol-gel process. The proton conductivity, as well as properties of swelling, methanol permeation, was measured in this study. The proton conductivity increased with the molar ratio of $H_3PO_4$ to silica. With the silica content increasing, swelling degree decreased and methanol permeability showed a slight increase. It suggested that the former was mainly determined by hydrophilicity of the membrane, while the latter was dominated by the interconnectivity of matrix. According to the value of on, the optimal conformations of these composite membranes were 60, 70, 80 wt.$\%$ of PS-x in membranes, where x were 1.5, 1.0, and 0.5, respectively. These composite membranes were thermal stability up to $200^{\circ}C$.

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연료전지용 불소화 폴리벤즈이미다졸 양성자 교환 멤브레인 합성 및 특성평가 (Synthesis and Characterization of Fluorinated Polybenzimidazole Proton Exchange Membranes for Fuel Cell)

  • 김애란
    • 한국수소및신에너지학회논문집
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    • v.28 no.1
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    • pp.24-29
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    • 2017
  • A fluorinated polybenzimidazole (FPBI) was synthesized from 3,3-diaminobenzidine (DAB) of tetraamine, 2,2-bis(4-carboxyphenyl)hexafluoropropane of aromatic biscarboxylic acid, and 4,4-sulfonyldibenzoic acid of aromatic biscarboxylic acid in polyphosphoric acid (PPA). A FPBI was easily cast and made into clear films. The structure of condensation polymers and corresponding membranes were analyzed using GPC (gel permeation chromatography), $^1H$-NMR ($^1H$ nuclear magnetic resonance) and FT-IR (fourier transform infrared). TGA (thermogravimetric analysis) analysis showed that the prepared membranes were thermally stable, so that elevated temperature fuel cell operation would be possible. The proton conductivity of the FPBI membranes increased with increasing temperatures in the polymer. A FPBI membrane has a maximum ion conductivity of 45 mS/cm at $90^{\circ}C$ and 100% relative humidity.

PVdF/SPEEK/$TiO_2$ 하이브리드 막의 프로톤 전도도 및 메탄올 전이현상 (Proton Conductivity and Methanol Transport Behaviour of PVdF/SPEEK/$TiO_2$ Hybrid Membrane)

  • 유선경;;박수길
    • 한국전기전자재료학회:학술대회논문집
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    • pp.409-411
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    • 2005
  • A series of inorganic-organic hybrid membranes were prepared with a systematic variation of titanium dioxidenanoparticles content. Their water uptake, methanol permeability and proton conductivity as a function of inorganic oxide content were investigated. The results obtained show that the inorganic oxide network decreases the proton conductivity and water swelling. It is also found that increase in inorganic oxide content leads to decrease of methanol permeability. In terms of the morphology, membranes are homogeneous and exhibit a good adhesion between inorganic domains and the polymer matrix. The properties of the composite membranes are compared with the standard nation membrane.

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고효율 소형 연료전지의 개발 : I.유기-무기 나노복합 전해질막의 합성 (Development of High-Efficient Small Euel Cells : I. Synthesis of Organic-Inorganic Nanocomposite Electrolyte Membranes)

  • 박용일;문주호;김혜경;김석환
    • 한국세라믹학회지
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    • v.42 no.1
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    • pp.50-55
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    • 2005
  • (3-Mercaptopropyl) trimethoxysilane(MPTS)의 thoil기(-SH)의 적절한 산화 및 (3-glycidoxypropyl) trimethooxysilane(GHS)와의 수화/중축합 반응을 통하여 얻어진 고분자 기질을 사용하여 새로운 고 프로톤 전도성 유기-무기 나노복합막을 성공적으로 합성하였다. 합성된 나노복합막으로부터 얻어진 프로톤 전도도는 $25^{circ}C$에서 $10^{-2} S/cm$ 이상의 높은 값을 나타내었으며, 온도와 상대습도를 $70^{circ}C$$100RH\%$로 증가시킴에 따라 전도도는 $3.6{\times}10^{-1}$ S/cm까지 증가하였다. 복합체의 높은 프로톤 전도도는 MPTS 말단의 thiol의 산화에 의해 얻어지는 아황산기$(-SO_{3}^{-})$가 프로톤 donor로서 작용하고, GHS로부터 유도된 'pseudo polyethylene oxide' 네트워크가 프로톤의 전도 path로 작용하고 있음을 나타낸다.