• Title/Summary/Keyword: Hydrocarbon polymer

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A study on composite membranes based on hydrocarbon polymers and ionic liquids for high temperature PEFCs (고온 PEFCs를 위한 탄화수소계열 고분자와 이온성 액체를 함유하는 복합막에 관한 연구)

  • Baek, Ji-Suk;Park, Jin-Soo;Kim, Kyung-Hyun;Moon, Gi-Young;Kim, Hye-Kyung;Choi, Young-Woo;Park, Go-Gun;Yang, Tae-Hyun;Kim, Chang-Soo;Shul, Young-Gun
    • 한국신재생에너지학회:학술대회논문집
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    • pp.147-148
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    • 2009
  • The water-like ionic liquids have been widely used to enable the proton conduction in ionic liquid based membranes at high temperature and anhydrous PEFCs. In this study, we synthesized various kinds of composite membranes based on hydrocarbon polymers having good thermal and mechanical stabilities at high temperatures and ionic liquids. The composite membrane consisting of hydrocarbon polymer and ionic liquid was characterized by thermogravimetric analyzer (TGA) and impedance spectroscopy. Consequently the non-aqueous composite membranes of a variety of hydrocarbon polymer and ionic liquids have good conductivity and thermal stability at high temperature conditions.

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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.

Preparation of pore-filling membranes for polymer electrolyte fuel cells and their cell performances (고체 알칼리 연료전지용 음이온 교환 세공충진막의 제조 및 특성)

  • Choi, Young-Woo;Park, Gu-Gon;Yim, Sung-Dae;Lee, Mi-Soon;Yang, Tae-Hyun;Kim, Chang-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • pp.150-153
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    • 2009
  • Anion exchange polymer electrolyte pore-filling membranes consisting of the whole hydrocarbon materials were prepared by photo polymerization with various quaternary ammonium cationic monomers and characterized on the properties for applying to solid alkali fuel cell (SAFC). Hydrocarbon porous substrates such as polyethylene were used for the preparation of the pore-filling membranes. The hydroxyl ion conductivity of the polymer electrolyte membranes prepared in this research was dependent on the composition ratio of an electrolyte monomer and crosslinking agents used for polymerization. Furthermore, these pore-filling membranes have commonly excellent properties such as smaller dimensional affects when swollen in solvents, higher mechanical strength, lower fuel crossover through the membranes, and easier preparation process than those of traditional cast membranes.

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The Effect of sGO Content in sPEEK/sGO Composite Membrane for Unitized Regenerative Fuel Cell (일체형 재생연료전지 적용을 위한 sGO 함량 변화에 따른 sGO/sPEEK 복합막의 특성 평가)

  • Jung, Ho-Young;Kim, Min-Woo;Lim, Ji-Hun;Choi, Jin H.;Roh, Sung-Hee
    • KEPCO Journal on Electric Power and Energy
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    • v.2 no.1
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    • pp.127-131
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    • 2016
  • Polymer electrolyte membrane for unitized regenerative fuel cells requires high proton conductivity, high dimensional stability, low permeability, and low cost. However, DuPont's Nafion which is a commercial polymer electrolyte membrane has high permeability, high cost, and decreasing proton conductivity and dimensional stability over $80^{\circ}C$. To address these problems, sulfonated poly ether ether ketone (sPEEK) which is a low cost hydrocarbon polymer is selected as matrix polymer for the preparation of polymer electrolyte membrane. In addition, composite membrane with improved proton conductivity and dimensional stability is prepared by introducing sulfonated graphene oxide (sGO). The fundamental properties of polymer electrolyte membranes are analyzed by investigating membrane's water content, dimensional stability, proton conductivity, and morphology. The cell test is conducted to consider the possibility of application of sPEEK/sGO composite membrane for an unitized regenerative fuel cell.

Preparation of pore-filling membranes for polymer electrolyte fuel cells and their cell performances (고분자 연료전지용 세공충진막의 제조 및 연료전지 특성)

  • Choi, Young-Woo;Park, Jin-Soo;Lee, Mi-Soon;Park, Seok-Hee;Yang, Tae-Hyun;Kim, Chang-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • pp.278-281
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    • 2009
  • Proton exchange membrane is the key material for proton exchange membrane fuel cells (PEMFC). Currently widely-used perfluorosulfonic acid membranes have some disadvantages, such as low thermal stability, easy swelling, excessive crossover of methanol and high price etc. Other membranes, including sulfonated polymer, radiation grafted membranes, organic-inorganic hybrids and acid-base blends, do not satisfy the criteria for PEMFC, which set a barrier to the development and commercialization of PEMFC. Pore-filling type proton exchange membrane is a new proton exchange membrane, which is formed by filling porous substrate with electrolytes. Compared with traditional perfluorosulfonic acid membranes, pore-filling type proton exchange membranes have many advantages, such as non- swelling, low methanol permeation, high proton conductivity, low cost and a wide range of materials to choose. In this research, preparation methodology of pore-filling membranes by particularly using all hydrocarbon polymers and fuel cell performances with the membranes are evaluated.

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Effect of the spirobiindane group in sulfonated poly(arylene ether sulfone) copolymer as electrode binder for polymer electrolyte membrane fuel cells

  • Chae, Ji Eon;Kim, Bo Hyun;Noh, Jee Hyun;Jung, Jaewoo;Kim, Jin-Young;Jang, Jong Hyun;Yoo, Sung Jong;Kim, Hyoung-Juhn;Lee, So Young
    • Journal of Industrial and Engineering Chemistry
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    • v.47
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    • pp.315-322
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    • 2017
  • Electrode properties determine the membrane-electrode assembly (MEA) performance of fuel cells and are influenced by the materials and processing. A high-performance electrode requires good adhesion between the membrane and catalyst, excellent gas permeability, and good ion conduction. Here, sulfonated poly(arylene ether sulfone) (SPAES) containing a bulky spirobiindane (Spiro) group is proposed as a new hydrocarbon electrode binder for MEAs. The effect of the Spiro group on MEA performance was compared to that of the common biphenylsulfone. The structural differences between the two binders affected the mass transport region of the current-voltage polarization (related to gas permeation). The spiro-polyethersulfone (PES) had 115 times higher $O_2$ permeability (30 Barrer) than that of PES. From $^1H\;NMR$ spectra, the degree of sulfonation (DS) of each SPAES was confirmed, where the proton conductivity of Spiro 30, Spiro 20, and BPS 30 were 28.2, 10.1, and $26.9mS\;cm^{-1}$, respectively. In addition, the DS of the electrode binder contributed to the Ohmic region of the i-V curve. The Ohmic resistance of these hydrocarbon binders was similar to that of commercial Nafion binder ($0.13-0.15{\Omega}cm^2$). However, the charge transfer resistance of our binders was higher than that of Nafion due to insufficient gas permeability and low proton conductivity.

Synthetic Strategies for High Performance Hydrocarbon Polymer Electrolyte Membranes (PEMs) for Fuel Cells (고성능 탄화수소계 고분자 전해질막의 합성 전략)

  • Lee, So Young;Kim, Hyoung-Juhn;Nam, Sang Yong;Park, Chi Hoon
    • Membrane Journal
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    • v.26 no.1
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    • pp.1-13
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    • 2016
  • Fuel cells are regarded as a representative energy source expected to replace fossil fuels particularly used in internal combustion engines. One of the most important components is polymer electrolyte membranes (PEMs) acting as a proton conducting barrier to prevent fuel gas crossover. Since water channels act as proton pathways through PEMs, many researchers have been focused on the 'good phase-separation of hydrophilic moiety' which ensures high water retention under low humidity enough to keep the water channel for good proton conduction. Here, we summarized the strategies which have been adopted to synthesize sulfonated PEMs having high proton conductivities even under low humidified conditions, and hope this review will be helpful to design high performance hydrocarbon PEMs.

A Study on the Etcting Technology for Metal Interconnection on Low-k Polyimide (Low-k Polyimide상의 금속배선 형성을 위한 식각 기술 연구)

  • Mun, Ho-Seong;Kim, Sang-Hun;An, Jin-Ho
    • Korean Journal of Materials Research
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    • v.10 no.6
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    • pp.450-455
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    • 2000
  • For further scaling down of the silicon devices, the application of low dielectric constant materials instead of silicon oxide has been considered to reduce power consumption, crosstalk, and interconnection delay. In this paper, the effect of $O_2/SF_6$ plasma chemistry on the etching characteristics of polyimide-one of the promising low-k interlayer dielectrics-has been studied. The etch rate of polyimide decreases with the addition of $SF_6$ gas due to formation of nonvolatile fluorine compounds inhibiting reaction between oxygen and hydrocarbon polymer, while applying substrate bias enhances etching process through physical attack. However, addition of small amount of $SF_6$ is desirable for etching topography. $SiO_2$ hard mask for polyimide etching is effective under $O_2$plasma etching(selectivity~30), while $O_2/SF_6$ chemistry degrades etching selectivity down to 4. Based on the above results, $1-2\mu\textrm{m}$ L&S PI2610 patterns were successfully etched.

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Research of Cross-linked Hydrocarbon based Polymer Electrolyte Membranes for Polymer Electrolyte Membrane Fuel Cell Applications (고분자 전해질 막 연료전지 응용을 위한 탄화수소계 기반 가교 전해질 막의 연구동향)

  • Ko, Hansol;Kim, Mijeong;Nam, Sang Yong;Kim, Kihyun
    • Membrane Journal
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    • v.30 no.6
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    • pp.395-408
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    • 2020
  • Polymer electrolyte membrane fuel cells (PEMFCs) have gained much attention as eco-friendly energy conversion devices without emission of environmental pollutant. Polymer electrolyte membrane (PEM) that can transfer proton from anode to cathode and also prevent fuel cross-over has been regarded as a key component of PEMFCs. Although perfluorinated polymer membranes such as Nafion® were already commercialized in PEMFCs, their high cost and toxic byproduct generated by degradation have still limited the wide spread of PEMFCs. To overcome these issues, development of hydrocarbon based PEMs have been studied. Incorporation of cross-linked structure into the hydrocarbon based PEM system has been reported to fabricate the PEMs showing both high proton conductivity and outstanding physicochemical stability. This study focused on the various cross-linking strategies to the preparation of cross-linked PEMs based on hydrocarbon polymers with ion conducting groups for application in PEMFCs.