Self-assembly of highly charged polyelectrolyte complexes with superior proton conductivity and methanol barrier properties for fuel cells

Yılmaztürk, Serpil; Deligöz, Hüseyin; Yılmazoğlu, Mesut; Damyan, Hakan; Öksüzömer, M.A. Faruk; Koç, Serkan Naci; Durmuş, Ali; Gürkaynak, M. Ali

doi:10.1016/j.jpowsour.2009.08.044

Cited by 33 publications

(12 citation statements)

References 40 publications

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“…Concerning the thermal degradation behavior of lbl composite membrane, it can be seen from the figure that thermal degradation of composite membrane with a deposition of 30 layer of PAH/sPAni‐H + (S/N ratio = 0.85) slightly enhanced as compared to the original Nafion membrane. This result is consistent with our previous result . This increase in the thermal stability of lbl composite membrane can be attributed to the formation of polyelectrolyte complex between sulfonic acid group of Nafion and amine group of PAH.…”

Section: Resultssupporting

confidence: 93%

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Nanostructured membrane electrode assemblies from layer‐by‐layer composite/catalyst containing membranes and their fuel cell performances

Deligöz

Yılmaztürk

Gümüşoğlu

2014

J of Applied Polymer Sci

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In this study, two approaches are compared to develop nanostructured membrane electrode assemblies (MEA) using layer‐by‐layer (lbl) technique. The first is based on the direct deposition of polyallylamine hydrochloride (PAH) and sulfonated polyaniline (sPAni) on Nafion support to prepare lbl composite membrane. In the second approach, sPAni is coated on the support in the presence of platinum (Pt) salt, Nafion solution and Vulcan for obtaining catalyst containing membranes (CCMs). SEM and UV–vis analysis show that the multilayers are deposited on both sides of Nafion successfully. Although H2/O2 single cell performances of acid doped lbl composite membrane based MEA are found to be at the range of 126 and 160 mW cm−2 depending on the number of deposited layers, the cell performance of MEA obtained from catalyst containing lbl self‐assembled thin membrane (PAH/sPAni‐H+)10‐Pt is found to be 360 mW cm−2 with a Pt utilization of 720 mW mgPt−1. This performance is 82% higher as compared to original Nafion®117 based MEA (198 mW cm−2). From the cell performance evaluations for different structured MEAs, it is mainly found out that the use of lbl CCMs instead of composite membranes and fabrication of thinner electrolytes result in a higher H2/O2 cell activity due to significant reduction in ohmic resistivity. Also, it is observed that the use of sPAni slightly improves the cell performance due to an increased probability of the triple phase contact and it can lead to superior physicochemical properties such as conductivity and thermal stability. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40314.

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Section: Resultssupporting

confidence: 93%

“…In all lbl deposition experiments, Milli‐Q ultrapure water (Millipore 18.2 MΩ at 25°C) was used. Prior to deposition, original Nafion membrane was treated according to our previous study to remove organic impurities and activate it …”

Section: Methodsmentioning

confidence: 99%

Nanostructured membrane electrode assemblies from layer‐by‐layer composite/catalyst containing membranes and their fuel cell performances

Deligöz

Yılmaztürk

Gümüşoğlu

2014

J of Applied Polymer Sci

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“…Deligoz et al prepared PAH/PSS [193] and PVH/PSS [194] multilayered PEC membranes on Nafion supporting membranes, and studied their PEMFC performances. Generally, proton conductivity and methanol barrier properties of multilayered PEC membrane were influenced by the concentration and pH of polyelectrolyte dipping solutions, types and concentrations of added salt, charge density and chemical structures of assembly components, and so on.…”

Section: Multilayered Pec Membranes For Pemfcmentioning

confidence: 99%

Polyelectrolyte complex membranes for pervaporation, nanofiltration and fuel cell applications

Zhao

et al. 2011

Journal of Membrane Science

227

104

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“…The polyelectrolytes assembled were water soluble polycations, like linear poly (ethylene imine) (LPEI), poly(allylamine hydrochloride) (PAHC), poly (diallyl dimethyl ammonium chloride) (PDAC), and poly(4-vinylpyridine) (P4VP), paired with polyanions, like sulfonated poly(2,6-dimethyl À1,4-phenylene oxide) (sPPO) [167], or PAHC paired with polystyrene sulfonic acid (PSSA) or a fluorosulfonic surfactant [168]. Later, new LBL membranes based on Nafion were prepared with chitosan and sulfonated poly(aryl ether ketone) with carboxyl groups (sPAEK-C) [169], poly(vinylsulfate) (PVS) and PAHC [170], and chitosan and silicotungstic acid [171].…”

Section: Polymer/nafion Blendsmentioning

confidence: 99%

“…However, Nafion membranes coated with a layer of PAH exhibit a DMFC performance at 80 C much better (150 mW.cm À2 ) than Nafion (70 mW.cm À2 ) when fed with 5 M methanol. PAH and poly(vinyl sulphate) (PVS) were LBL assembled onto Nafion achieving a reasonable methanol selectivity (β r ¼ 3-4) [170], without test in DMFC.…”

Section: Methanol Selectivity Of Nafion Composite 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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Self-assembly of highly charged polyelectrolyte complexes with superior proton conductivity and methanol barrier properties for fuel cells

Cited by 33 publications

References 40 publications

Nanostructured membrane electrode assemblies from layer‐by‐layer composite/catalyst containing membranes and their fuel cell performances

Nanostructured membrane electrode assemblies from layer‐by‐layer composite/catalyst containing membranes and their fuel cell performances

Polyelectrolyte complex membranes for pervaporation, nanofiltration and fuel cell applications

Membranes for Direct Alcohol Fuel Cells

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