Characterization of nanohybrid membranes for direct methanol fuel cell applications

Hasani-Sadrabadi, Mohammad Mahdi; Ghaffarian, Seyed Reza; Mokarram-Dorri, Nassir; Dashtimoghadam, Erfan; Majedi, Fatemeh Sadat

doi:10.1016/j.ssi.2009.09.008

Cited by 38 publications

(37 citation statements)

References 42 publications

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“…However, it should also be noted that the experimentally obtained conductivities reported for SPEEK membranes in the literature are not the same. The simulation results are about one third to one fourth of our previously reported experimental values [18,19,38] quantitatively. One reason for the difference between simulation results and experimental data, which were also observed in MD simulations of other non-fluorinated polymeric membranes such as sulfonated poly (ether ether ketone ketone) and sulfonated poly (phenyl sulfone) [49,50], have been attributed to the simulation of proton diffusion inside the membrane without considering Grotthuss mechanism.…”

Section: Dynamic Property Analysissupporting

confidence: 67%

“…In order to examine the influence of DS upon the characteristics of the SPEEK membranes, DS values of 40, 50 and 62% were chosen for SPEEK chains to represent dependency of SPEEK behavior on sulfonation degree, as they were synthesized and characterized in our previous experimental work [18,19,38]. Each of these three SPEEK membranes was studied at two different temperatures of 298 and 313 K by MD simulation methods.…”

Section: Atomistic Models and Amorphous Cell Constructionmentioning

confidence: 99%

“…Therefore, to compensate the charges of sulfonate groups and obtain electrically neutral simulation cells, the same number of hydronium ions as the total number of sulfonate groups of each SPEEK membrane was used for MD simulations. The total number of water molecules used in the amorphous simulation cells was determined from corresponding water content (or l values defined as the number of water molecules per sulfonate groups) of SPEEK membrane at each DS obtained experimentally in our previous studies [18,38]. Table 1 detailed composition of the amorphous cells and MD simulation conditions.…”

Section: Atomistic Models and Amorphous Cell Constructionmentioning

confidence: 99%

See 2 more Smart Citations

Molecular dynamics simulation study of proton diffusion in polymer electrolyte membranes based on sulfonated poly (ether ether ketone)

Bahlakeh

Nikazar

Hafezi

et al. 2012

International Journal of Hydrogen Energy

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Section: Dynamic Property Analysissupporting

confidence: 67%

Section: Atomistic Models and Amorphous Cell Constructionmentioning

confidence: 99%

Section: Atomistic Models and Amorphous Cell Constructionmentioning

confidence: 99%

See 1 more Smart Citation

Molecular dynamics simulation study of proton diffusion in polymer electrolyte membranes based on sulfonated poly (ether ether ketone)

Bahlakeh

Nikazar

Hafezi

et al. 2012

International Journal of Hydrogen Energy

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“…In this regard, up to now number of different methodologies, including investigation of new polymers with nonfluorinated backbones, [6] blending, and crosslinking of ionomers, [7] and also incorporation of various inorganic fillers into polymeric matrices [1,2,[8][9][10][11][12] or a hybrid of such methods, [13] have been employed to fabricate alternative polymer electrolyte membranes for PEMFC applications.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite Proton Exchange Membranes Based on Sulfonated Poly (2,6-Dimethyl-1,4-Phenylene Oxide) with Enhanced Performance for Fuel Cell Applications

Aliabadi

Ebadi

Dashtimoghadam

et al. 2011

Journal of Macromolecular Science, Part B

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A series of composite membranes based on sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (SPPO) comprising phosphotungstic acid (PWA) were fabricated and investigated as polymeric electrolytes for hydrogen/oxygen fuel cell (PEMFC) applications. Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) matrices were first sulfonated to different extents to determine the maximum possible sulfonation degree, which ensures the highest proton conductivity as hydrolytic stability was not sacrificed. Subsequently, 20 wt% of PWA as a strong solid super acid was added into sulfonated polymeric matrices. Prepared composite membranes were characterized for their different properties including water uptake capacity, proton conductivity, and hydrolytic stability. The results of conductivity measurements revealed that in the presence of PWA molecules the proton conductivity of SPPO membranes with sulfonation degree of 40% was improved from 1.82 × 10 −2 S cm −1 to 2.57 × 10 −2 S cm −1 at 25 • C. The improved proton conductivity of the SPPO/PWA composite membranes was attributed to the possible interaction of the hydronium molecules with sulfonate groups on SPPO chains as well as the PWA particles. Moreover, it was found that prepared PWA-filled ionomers (SPPO-40) were able to provide high proton conductivity (0.08132 S cm −1 ) even at elevated temperature ranges (120 • C) as well as hydrolytic stability. Fuel cell performance tests showed that SPPO-40/PWA-20 nanocomposite membranes were able to provide 64% higher power output compared to corresponding pristine SPPO at 80 • C. Owing to the favorable properties of high proton conductivity, high power density, ease of preparation, and low cost, SPPO/PWA composite membrane could be considered as a promising polyelectrolyte for moderate temperature PEMFC applications.

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“…1 Among the various fuel cells, direct methanol fuel cells (DMFCs) are the most suitable for portable devices (cell phones and laptops), because they have a high charge density, low operating temperature, and simple fuel-cell setup (with easy storage of methanol and no need for a reformer). [2][3][4] The electrolyte is the most important component in any fuel-cell system. One of the main components in DMFCs is the electrolyte membrane.…”

Section: Introductionmentioning

confidence: 99%

PWA/silica doped sulfonated poly(ether sulfone) composite membranes for direct methanol fuel cells

Chen

Tsi

Tsen

et al. 2011

J of Applied Polymer Sci

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A novel sulfonated poly(ether sulfone) (SPES)/phosphotungstic acid (PWA)/silica composite membranes for direct methanol fuel cells (DMFCs) application were prepared. The structure and performance of the obtained membranes were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), water uptake, proton conductivity, and methanol permeability. Compared to a pure SPES membrane, PWA and SiO 2 doped membranes had a higher thermal stability and glass transition temperature (T g ) as revealed by TGA-FTIR and DSC. The morphology of the composite membranes indicated that SiO 2 and PWA were uniformly distributed throughout the SPES matrix. Proper PWA and silica loadings in the composite membranes showed high proton conductivity and sufficient methanol permeability. The selectivity (the ratio of proton conductivity to methanol permeability) of the SPES-P-S 15% composite membrane was almost five times than that of Nafion 112 membrane. This excellent selectivity of SPES/PWA/silica composite membranes indicate a potential feasibility as a promising electrolyte for DMFC.

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Characterization of nanohybrid membranes for direct methanol fuel cell applications

Cited by 38 publications

References 42 publications

Molecular dynamics simulation study of proton diffusion in polymer electrolyte membranes based on sulfonated poly (ether ether ketone)

Molecular dynamics simulation study of proton diffusion in polymer electrolyte membranes based on sulfonated poly (ether ether ketone)

Nanocomposite Proton Exchange Membranes Based on Sulfonated Poly (2,6-Dimethyl-1,4-Phenylene Oxide) with Enhanced Performance for Fuel Cell Applications

PWA/silica doped sulfonated poly(ether sulfone) composite membranes for direct methanol fuel cells

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