• Title, Summary, Keyword: Proton conductivity

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

  • Kim, Deuk Ju;Nam, Sang Yong
    • Membrane Journal
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    • v.22 no.3
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    • pp.155-170
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    • 2012
  • Fuel cells have been considered as alternative power generation system in the twenty-first century because of eco-friendly system, high power density and efficiency compare with petroleum engine system. Proton exchange membranes (PEMs) are the key components in fuel cell system. Currently, Nafion has been used in fuel cell system. However, Nafion has disadvantages such as low conductivity at high temperature and high cost. The researchers have focused to reach the high properties such as high proton conductivity, low permeability to fuel, good chemical/thermal stability, good mechanical properties and low manufacturing cost. Various methods have been developed for preparation of proton exchange membrane with high performance and commercialization of fuel cell system. The hybrid organic/inorganic membrane has the potentials to provide a unique combination of organic and inorganic properties with improved proton conductivity and mechanical property at high temperatures. So, this paper presents an overview of research trend for the composite membranes prepared by organic/inorganic system using various inorganic materials.

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

  • Shin, Mun-Sik;Oh, Gyu-Hyeon;Park, Jin-Soo
    • Membrane Journal
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    • v.26 no.2
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    • pp.135-140
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    • 2016
  • In this study, the organic-inorganic composite membranes composed of iron oxide (Ferroxane) and Nafion were developed as an alternative proton exchange membranes (PEMs) in proton exchange membrane fuel cell (PEMFC). Acetic acid-stabilized lepidocrocite (${\gamma}$-FeOOH) nanoparticles (ferroxane) was synthesized, and the ferroxane-Nafion composite membranes were prepared by mixing Nafion with the ferroxane. The composite membranes were investigated in terms of ionic conductivity, ion exchange capacity (IEC), FT-IR, thermal stability, etc. As a result, the ferroxane-Nafion composite membranes showed higher proton conductivity, IEC, thermal stability than Nafion recast membranes. The proton conductivity and IEC of the composite membrane with the best performance were $0.09S\;cm^{-1}$ and $0.906meq\;g^{-1}$, respectively.

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

  • Lee, Joong-Hee;Sambhu, Bhadra;Kim, Nam-Hoon;Lee, Hong-Ki;Kim, Hong-Gun
    • 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 Microscopy Study of the Morphological Variation of Hydrated Pronton Exchange Membrane (Current Sensing Atomic Force Microscopy를 이용한 PEM의 수화 현상에 따른 모폴로지 변화 연구)

  • Kwon, Osung;Lee, Sangcheol;Son, ByungRak;Lee, Dong-Ha
    • Journal of the Korean Solar Energy Society
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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.

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

  • Park, Ka-Young;Baek, Seung-Seok;Park, Jun-Young
    • Journal of the Korean Ceramic Society
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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
    • Journal of the Microelectronics and Packaging Society
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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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Synthesis and Characterization of Fluorinated Polybenzimidazole Proton Exchange Membranes for Fuel Cell (연료전지용 불소화 폴리벤즈이미다졸 양성자 교환 멤브레인 합성 및 특성평가)

  • KIM, AE RHAN
    • Transactions of the Korean hydrogen and new energy society
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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.

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

  • You, Sun-Kyung;Kalappa, Preshantha;Park, Soo-Gil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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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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Development of High-Efficient Small Euel Cells : I. Synthesis of Organic-Inorganic Nanocomposite Electrolyte Membranes (고효율 소형 연료전지의 개발 : I.유기-무기 나노복합 전해질막의 합성)

  • Park, Yong-Il;Moon, Joo-Ho;Kim, Hye-Kyung;Kim, Suk-Hwam
    • Journal of the Korean Ceramic Society
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    • v.42 no.1
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    • pp.50-55
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    • 2005
  • New fast proton-conducting organic-inorganic nanocomposite membranes were successfully fabricated using polymer matrix obtained through proper oxidation of thiol ligands in (3-Mercaptopropyl) trimethoxysilane (MPTS) and hydrolysis/condensation reaction of (3-glycidoxypropyl) trimethoxysilane (GPTS). The obtained nanocomposite membranes showed relatively hirh proton-conductivity over $10^{-2}S/cm$ at $ 25^{circ}C$. The proton conductivities of the fabricated composite membranes increased up to $3.6{\times}10^{-1}$ S/cm cm by increasing temperature and relative humidity to $70^{circ}C$ and 100 $100RH\%$. The high proton conductivity of the composites Is due to the proton conducting path through the GPTS-derived 'pseudo-polyethylene oxide 'network in which sulfonic acid ligands work as a proton donor.