• Title, Summary, Keyword: Polymer electrolyte membrane

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Perfluorinated Sulfonic Acid Ionomer-PTFE Pore-filling Membranes for Polymer Electrolyte Membrane Fuel Cells (고분자전해질연료전지용 과불소계 술폰화 이오노머-PTFE 강화막)

  • Kang, Seong Eun;Lee, Chang Hyun
    • Membrane Journal
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    • v.25 no.2
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    • pp.171-179
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    • 2015
  • Perfluorinated sulfonic acid ionomers (PFSAs) have been widely as solid electrolyte materials for polymer electrolyte membrane fuel cells, since they exhibit excellent chemical durability under their harsh application conditions as well as good proton conductivity. Even PFSA materials, however, suffer from physical failures associated with repeated membrane swelling and deswelling, resulting in fairly reduced electrochemical lifetime. In this study, pore-filling membranes are prepared by impregnating a Nafion ionomer into the pore of a porous PTFE support film and their fundamental characteristics are evaluated. The developed pore-filling membranes exhibit extremely high proton conductivity of about $0.5S\;cm^{-1}@90^{\circ}C$ in liquid water.

Current Patents and Papers Research Trend of Fuel Cell Membrane (특허 및 논문 게재 분석을 통한 연료전지용 전해질막의 연구동향)

  • Woo, Chang Hwa
    • Membrane Journal
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    • v.26 no.6
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    • pp.407-420
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    • 2016
  • The fuel cell technology as a green energy source has been actively studied to solve energy shortages and pollution problems. The generating efficiency of fuel cell is high because the electricity is directly produced by using hydrogen and oxygen and the additional power generator is not needed. The key technology is the manufacturing process of polymer electrolyte membranes for polymer electrolyte membrane fuel cell (PEMFC) system. The Nafion, perfluoro-based polymeric membrane is mainly used as a polymer electrolyte membrane. However, the Nafion is expensive and rapidly decreases the performance of Nafion at high temperature. So, many researchers are lively studying new alternative electrolyte membranes. In this review, through the technology competitiveness evaluation of patents and papers, the frequencies of presentation are filed by country, institution and company. In addition, polymer electrolyte membrane fuel cell, direct methanol fuel cell and alkaline fuel cell are also filed.

Electrospun Poly(Ether Sulfone) Membranes Impregnated with Nafion for High-Temperature Polymer Electrolyte Membrane Fuel Cells

  • Lee, Hong Yeon;Hwang, Hyung Kwon;Lee, Jin Goo;Jeon, Yukwon;Park, Dae-Hwan;Kim, Jong Hak;Shul, Yong-Gun
    • Journal of the Korean Electrochemical Society
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    • v.19 no.1
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    • pp.9-13
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    • 2016
  • Electrospun poly(ether sulfone) (PES) membrane impregnated with Nafion (PES-N) have been developed for high-temperature polymer-electrolyte membrane fuel cell (HT-PEMFC). The PES-N obtains highly thermal stability up to $430^{\circ}C$, which is higher than that of the commercial Nafion 212. The PES-N membrane shows a good proton conductivity of about $10^{-2}S\;cm^{-1}$ in a temperature range from $75^{\circ}C$ to $120^{\circ}C$. The membrane-electrode assembly (MEA) with the PES-N membrane exhibits a current density of $1.697A\;cm^{-2}$ at $75^{\circ}C$, and $0.813A\;cm^{-2}$ at $110^{\circ}C$ when the applied voltage is 0.6 V, whereas the MEA with the Nafion 212 membrane shows the current density of $0.647Acm^{-2}$ at $110^{\circ}C$. The results suggest that the PES-N can be a good candidate for a polymer electrolyte membrane of the HT-PEMFC.

Poly(vinyl alcohol)-based Polymer Electrolyte Membrane for Solid-state Supercapacitor (고체 슈퍼캐퍼시터를 위한 폴리비닐알콜 고분자 전해질막)

  • Lee, Jae Hun;Park, Cheol Hun;Park, Min Su;Kim, Jong Hak
    • Membrane Journal
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    • v.29 no.1
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    • pp.30-36
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    • 2019
  • In this study, we reported a solid-state supercapacitor consisting of titanium nitride (TiN) nanofiber and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT-PSS) conducting polymer electrode and poly(vinyl alcohol) (PVA)-based polymer electrolyte membrane. The TiN nanofiber was selected as electrode materials due to high electron conductivity and 2-dimensional structure which is beneficial for scaffold effect. PEDOT-PSS is suitable for organic/inorganic composites due to good redox reaction with hydrogen ions in electrolyte and good dispersion in solution. By synergetic effect of TiN nanofiber and PEDOT-PSS, the PEDOT-PSS/TiN electrode showed higher surface area than the flat Ti foil substrate. The PVA-based polymer electrolyte membrane could prevent leakage and explosion problem of conventional liquid electrolyte and possess high specific capacitance due to the fast ion diffusion of small $H^+$ ions. The specific capacitance of PEDOT-PSS/TiN supercapacitor reached 75 F/g, which was much higher than that of conventional carbon-based supercapacitors.

Fabrication of Hydrocarbon Polymer Electrolyte Composite Membrane Incorporated with Pt Nanopartle for PEMFC and Its Characteristics (Pt 나노 입자가 도입된 연료전지용 탄화수소계 고분자 전해질 복합막의 제조 및 특성)

  • LEE, HONGKI
    • Transactions of the Korean hydrogen and new energy society
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    • v.28 no.3
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    • pp.246-251
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    • 2017
  • To fabricate a hydrocarbon polymer electrolyte composite membrane incorporated with Pt nanoparticle, the polymer electrolyte membrane made of a sulfonated-fluorinated hydrophilic-hydrophobic block copolymer (SFBC) and sulfonated poly (ether ether ketone) (SPEEK) blend in the wight ratio of 1 : 1 was synthesized, and a simple drying process was used in order to incorporate Pt nanoparticle into the SFBC/SPEEK film by reducing platinum (II) bis (acetylacetonate), Pt $(acac)_2$. The distribution of the Pt nanoparticles was observed by transmission electron microscopy (TEM), and mechanical and thermal properties were tested by universal testing machine (UTM) and thermogravimetry analyzer (TGA). Cation conductivity, ion exchange capacity (IEC) and I-V characteristics were estimated.

Electrochemical Properties of Novel Metal Powder Electrodes for Polymer Electrolyte Membrane Electrolysis

  • Kim, Chang-Hee;Kang, Kyung-Soo;Park, Chu-Sik;Hwang, Gab-Jin;Bae, Ki-Kwang
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • pp.1227-1228
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    • 2006
  • The electrochemical properties of novel metal powders were investigated for the electrode materias of polymer electrolyte memebrane electrolysis. Two types of Pt black and $IrO_2$ powder electrodes were hot-pressed on the polymer electrolyte membrane to form membrane electrode assembly. The galvanodynamic polarization methode was used to characterize the electrochemical properties of both electrodes. From the experimental results, we concluded that the $IrO_2$ powder electrode exhibits better electrochemical performance than Pt black as cathode material for the electrolysis.

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Effect of operating conditions on carbon corrosion in High temperature polymer electrolyte membrane fuel cells (HT-PEMFCs) (고온형 고분자 전해질막 연료전지(HT-PEMFC) 구동환경에 따른 탄소 담지체 부식 평가)

  • Lee, Jinhee;Kim, Hansung
    • 한국신재생에너지학회:학술대회논문집
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    • pp.89.1-89.1
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    • 2011
  • The influence of potential and humidity on the electrochemical carbon corrosion in high temperature polymer electrolyte membrane fuel cells(HT-PEMFCs) is investigated by measuring $CO_2$ emission at different potentials for 30 min using on-line mass spectrometry. These results are compared with low tempterature polymer electrolyte membrane fuel cells(LT-PEMFCs) operated at lower temperature and higher humidity condition. Although the HT-PEMFC is operated at non humidified condition, the emitted $CO_2$ in the condition of HT-PEMFC is more than LT-PEMFC at the same potential in carbon corrosion test. Thus, carbon corrosion shows a stronger positive correlation with the cell temperature. In addition, the presence of a little amount of water activate electrochemical carbon corrosion considerably in HT-PEMFC. With increased carbon corrosion, changes in fuel cell electrochemical characteristics become more noticeable and thereby indicate that such corrosion considerably affects fuel cell durability.

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Son transport characteristics through random or block polymer electrolyte membranes (랜덤 및 블록 공중합에 따른 고분자 전해질막의 이온전도특성)

  • Park, Chi-Hoon;Lee, Chang-Hyun;Nam, Sang-Yong;Park, Ho-Bum;Lee, Young-Moo
    • Proceedings of the Membrane Society of Korea Conference
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    • pp.57-60
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    • 2004
  • Polymer electrolyte membranes have been studied widely in chloro-alkali electrolysis, cationic exchange resins, and fuel cell applications. Especially, sulfonated polyimide membranes have been suggested as a potential polymer electrolyte in PEMFC due to their excellent thermal stability and high proton conductivity.(omitted)

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Synthesis of Starch-g-PAN Polymer Electrolyte Membrane and Its Application to Flexible Solid Supercapacitors (Starch-g-PAN 고분자 전해질막 합성 및 플렉서블 고체 슈퍼 캐퍼시터 응용)

  • Min, Hyo Jun;Jung, Joo Hwan;Kang, Miso;Kim, Jong Hak
    • Membrane Journal
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    • v.29 no.3
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    • pp.164-172
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    • 2019
  • In this work, we demonstrate a facile process to prepare an electrolyte membrane for the supercapacitor based on a graft copolymer consisting of starch and poly(acrylonitrile) (PAN). The graft copolymer (starch-g-PAN) was synthesized via free radical polymerization initiated by ceric ions. The starch-g-PAN was dissolved in ionic liquid, i.e. 1-ethyl-3-methylimidazolium dicyanamide (EMIM DCA) without any organic solvents at room temperature. The gelation of polymer electrolyte membranes occurred by applying high temperature, i.e. $100^{\circ}C$ for 1 hour. The resultant electrolyte membrane was flexible and thus applied to flexible solid supercapacitors. The performance of the supercapacitor based on starch-g-PAN graft copolymer electrolyte reached 21 F/g at a current density of 0.5 A/g. The cell also showed high cyclic stability with 86% of retention rate within 10,000 cycles. The preparation of starch-g-PAN based polymer electrolyte membrane provides opportunities for facile fabrication of flexible solid supercapacitors with good performance.