Grafted polymer electrolyte membrane for direct methanol fuel cells

Shen, Muzhong; Roy, S.; Kuhlmann, Julia; Scott, Keith; Lovell, Keith V.; Horsfall, J.A.

doi:10.1016/j.memsci.2004.11.006

Cited by 87 publications

(48 citation statements)

References 11 publications

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“…The preference by ETFE as base polymer was based on its low cost, although the DMFC performance of membranes based on PVdF seems to be superior [175].…”

Section: Other Fluorinated Membranesmentioning

confidence: 99%

Membranes for Direct Alcohol Fuel Cells

Corti

2013

Direct Alcohol Fuel Cells

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This chapter is devoted to summarize and discuss the main properties of ionomeric membranes used in direct alcohol PEM fuel cells. Although Nafion is the proton exchange membrane commonly used in methanol and other direct alcohol fuel cells, other proton and alkaline membranes are being investigated in order to improve the efficiency of DAFC. The goals in the development of this critical component of DAFC are: low cost, long durability, low alcohol permeability and high electrical conductivity. The last two properties can be combined in a single parameter, the membrane selectivity that accounts for the ratio between the proton and alcohol transport through the membrane. This parameter can be compared to that measured for Nafion to define a relative selectivity, which is a primary parameter to evaluate the potentiality of a ionomer material to be used in alcohol feed fuel cells.The vast catalogue of polymeric materials reviewed here included Nafion composite with inorganic and organic fillers, and non-fluorinated proton conducting membranes such as sulfonated polyimides, poly(arylene ether)s, polysulfones, poly (vinyl alcohol), polystyrenes, and acid-doped polybenzimidazoles. Anionexchange membranes are also discussed because of the facile electro-oxidation of alcohols in alkaline media and because of the minimization of alcohol crossover in alkaline direct alcohol fuel cells.The performance of different types of membranes in direct alcohol fuel cells, mainly methanol, are summarized and discussed in order to identify the most promissory ones. The lack of correlation between the relative selectivity and fuel cell performance of the membranes indicates that the architecture of the three

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“…The preference by ETFE as base polymer was based on its low cost, although the DMFC performance of membranes based on PVdF seems to be superior [175].…”

Section: Other Fluorinated Membranesmentioning

confidence: 99%

Membranes for Direct Alcohol Fuel Cells

Corti

2013

Direct Alcohol Fuel Cells

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“…Agar bersifat hidrofil dan dapat menghantarkan proton maka film cPTFE-g-S disulfonasi dan dihidrolisis dalam air panas [5]. Pada makalah sebelumnya telah didiskusikan preparasi dan karakterisasi membran cPTFE-g-S [3].…”

Section: Pendahuluanunclassified

SULFONASI FILM cPTFE TERCANGKOK STIRENA UNTUK MEMBRAN PENGHANTAR PROTON SEL BAHAN BAKAR

Yohan¹

2010

MST

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AbstrakTelah dilakukan proses sulfonasi pada politetrafluoroetilena berikatan silang yang teriradiasi sinar-γ dan tercangkok monomer stirena (film cPTFE-g-S). Penelitian bertujuan untuk membuat bahan membran hidrofil yang dapat berperan sebagai membran penukar proton pada sel bahan bakar jenis PEMFC. Sulfonasi dilakukan dengan asam klorosulfonat dalam pelarut dikloroetana pada berbagai kondisi. Pengaruh persen pencangkokan, konsentrasi asam klorosulfonat, waktu dan suhu reaksi terhadap sifat-sifat film tersulfonasi diuji. Hasil penelitian menunjukkan bahwa proses sulfonasi yang dilakukan pada suhu kamar tidak memberikan hasil yang sempurna. Peningkatan konsentrasi ClSO 3 H dan suhu reaksi mempercepat terjadinya proses sulfonasi namun juga menambah jumlah reaksi samping. Akibatnya kapasitas penukaran ion, pengikatan air, dan konduktivitas proton film menjadi semakin berkurang namun ketahanan oksidasi pada larutan perhidrol menjadi semakin bertambah. Membran cPTFE-g-SS yang dihasilkan mempunyai kestabilan dalam larutan H 2 O 2 30% volume selama 20 jam. AbstractSulfonation of cPTFE Film grafted Styrene for Proton Exchange Membrane Fuel Cell. Sulfonation of γ-ray iradiated and styrene-grafted crosslinked polytetrafluoroethylene film (cPTFE-g-S film) have been done. The aim of the research is to make hydropyl membrane as proton exchange membrane fuel cell. Sulfonation was prepared with chlorosulfonic acid in chloroethane under various conditions. The impact of the percent of grafting, the concentration of chlorosulfonic acid, the reaction time,and the reaction temperature on the properties of sulfonated film is examinated. The results show that sulfonation of surface-grafted films is incomplete at room temperature. The increasing of concentration of chlorosulfonic acid and reaction temperature accelerates the reaction but they also add favor side reactions. These will lead to decreasing of the ion-exchange capacity, water uptake, and proton conductivity but increasing the resistance to oxidation in a perhidrol solution. The cPTFE-g-SS membrane which is resulted has stability in a H 2 O 2 30% solution for 20 hours.

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“…Chemically grafted polymers have received attention for the fabrication of electrolyte membranes due to their low cost and to the variety of functional groups that can be used. Films of poly(vinylidene fluoride) PVDF, poly(vinylidene fluoride-co-hexafluoropropylene) PVDF-co-HFP, poly(ethylene-tetrafluoroethylene) ETFE, poly (tetrafluoroethylene-co-hexafluoropropylene) FEP or low-density polyethylene LDPE have been used as base polymer for membrane fabrication [8][9][10][11][12]. These films were radiation grafted with styrene or styrene derivatives such as m,p-methylstyrene or p-tert-butylstyrene [13], and subsequently sulfonated to attain high proton conductivity.…”

Section: E-mail Addressmentioning

confidence: 99%

Non-fluorinated proton-exchange membranes based on melt extruded SEBS/HDPE blends

Mokrini

Huneault

Shi

et al. 2008

Journal of Membrane Science

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This paper reports on functional polymer blends prepared by melt-processing technologies for proton-exchange membrane applications. Styrene-ethylene/butylene-styrene (SEBS) and high-density polyethylene (HDPE) were melt blended using twin-screw compounding, extruded into thin films by extrusion-calendering. The films were then grafted with sulfonic acid moieties to obtain ionic conductivity leading to proton-exchange membranes. The effect of blend composition and sulfonation time was investigated. The samples were characterized in terms of morphology, microstructure, thermo-mechanical properties and in terms of their conductivity, ion exchange capacity (IEC) and water uptake in an effort to relate the blend microstructure to the membrane properties. The HDPE was found to be present in the form of elongated structures which created an anisotropic structure especially at lower concentrations. The HDPE increased the membrane mechanical properties and restricted swelling, water uptake and methanol crossover. Room temperature through-plane conductivities of the investigated membranes were up to 4.5E−02Scm −1 at 100% relative humidity, with an ionic exchange capacity of 1.63 meq g −1 .Crown

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Grafted polymer electrolyte membrane for direct methanol fuel cells

Cited by 87 publications

References 11 publications

Membranes for Direct Alcohol Fuel Cells

Membranes for Direct Alcohol Fuel Cells

SULFONASI FILM cPTFE TERCANGKOK STIRENA UNTUK MEMBRAN PENGHANTAR PROTON SEL BAHAN BAKAR

Non-fluorinated proton-exchange membranes based on melt extruded SEBS/HDPE blends

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