Preparation of Nafion® nanocomposite membrane modified by phosphoric acid-functionalized 3-APTES

Kang, Jung-Soo; Ghil, Lee-Jin; Kim, Young-Sang; Rhee, Hee‐Woo

doi:10.1016/j.colsurfa.2007.04.094

Cited by 8 publications

(5 citation statements)

References 11 publications

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“…More attention has been paid to Nafion composite membranes doped with bifunctional inorganic fillers containing silicon, including silica − and polysiloxane. − Most of these reports demonstrate that Nafion composite membranes modified by incorporating the bifunctional particles containing silicon into the Nafion matrix show better membrane properties such as improved water management, a different proton-conducting kinetic mechanism, and a lower methanol permeability than pristine Nafion due to the hygroscopic and proton-conductive properties of bifunctional fillers (Figure ).…”

Section: Perfluorosulfonic Acid Ionomer Membranesmentioning

confidence: 99%

“…The Nafion nanocomposite membrane containing 3 wt % phosphoric acid-functionalized (3-aminopropyl)triethoxysilane (3-APTES) has a methanol permeability at least 50% lower than that of Nafion and a maximum proton conductivity of 0.07 S cm –1 , which is comparable with the conductivity of Nafion. However, the stability of the phosphoric acid group on 3-APTES has not been evaluated …”

Section: Perfluorosulfonic Acid Ionomer Membranesmentioning

confidence: 99%

“…However, the stability of the phosphoric acid group on 3-APTES has not been evaluated. 177 Polyphenylsilsesquioxane (PPSQ) is a class of polysiloxane which has high heat stability, high crystallinity, and fuel suppressibility.…”

Section: Pfsi Composite Membranes With Incorporated Organic or Inorga...mentioning

confidence: 99%

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Recent Development of Polymer Electrolyte Membranes for Fuel Cells

2012

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Membranes with Proton-Conducting Polymer Components 2793 4. Nonfluorinated Acid Ionomer Membranes 2793 4.1. Poly(arylene ether)-Based Membranes 2793 4.1.1. Modification of SPEEK Membrane 2793 4.1.2. Poly(arylene ether)s with Cross-Linkable Groups 2794 4.1.3. Poly(arylene ether)s with Pendant Sulfonated Groups or Side-Chains 2799 4.1.4. Poly(arylene ether)s with Backbones Containing Heteroatoms Such as F, N, S, and P 2800 4.1.5. Multiblock Copoly(arylene ether)s Synthesized by the Coupling Reaction of Hydrophilic and Hydrophobic Macromonomers 2803 4.2. Polyimide-Based Membranes 2804 4.2.1. SPIs Based on NTDA 2804 4.2.2. SPIs based on BNTDA 2806 4.2.3. SPIs Based on Other Dianhydrides 2807 4.3. Hydrocarbon Polymer with Aliphatic Main-Chain-Based Membranes 2807 4.4. Glass Membranes 2809 5. Polybenzimidazole/H 3 PO 4 Membranes 2809 5.1. Modifications to mPBI 2810 5.1.1. Optimizations of Preparation and Operation of Acid-Doped mPBI System 2810 5.1.2. Modified mPBI/H 3

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Section: Perfluorosulfonic Acid Ionomer Membranesmentioning

confidence: 99%

Section: Perfluorosulfonic Acid Ionomer Membranesmentioning

confidence: 99%

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Recent Development of Polymer Electrolyte Membranes for Fuel Cells

2012

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“…This value is almost 70% higher than the maximum value and 8.5 folds of the minimum value of the prepared modified cellophane membranes. Nafion nanocomposite membrane modified by phosphoric acid shows a reduction of the methanol permeability 35. Minimum value of 1.0 × 10 −7 (cm 2 s) was obtained using 5 wt % MeOH compared to 4.7 × 10 −7 (cm 2 s) of our modified membranes.…”

Section: Resultsmentioning

confidence: 64%

Preparation and characterization of novel grafted cellophane‐phosphoric acid‐doped membranes for proton exchange membrane fuel‐cell applications

Abu‐Saied

Elzatahry

El–Khatib

et al. 2011

J of Applied Polymer Sci

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This work concerns preparation of acid-base polyelectrolyte membranes for fuel-cell applications from cellulosic backbones for the first time. Grafted cellophanephosphoric acid-doped membranes for direct oxidation methanol fuel cells (DMFC) were prepared following three steps. The first two steps were conducted to have the basic polymers. The first step was introducing of epoxy groups to its chemical structure through grafting process with poly(-glycidylmethacrylate) (PGMA). The second step was converting the introduced epoxy groups to imides groups followed by phosphoric acid (APO 3 H) doping as the last step. This step significantly contributes to induce ion exchange capacity (IEC) and ionic conductivity (IC). Chemical changes of the cellophane composition and morphology characters were followed using FTIR, TGA, and SEM analysis. Different factors affecting the membranes characters especially IEC, methanol permeability, and thermal stability were investigated and optimized to have the best preparation conditions. Compared to Nafion 117 membrane, cellophane-modified membranes show a better IEC, less methanol permeability, and better mechanical and thermal stability. IEC in the range of 1-2.3 meq/g compared to 0.9 meq/g per Nafion was obtained, and methanol permeability has been reduced by one-order magnitude. However, the maximum obtained IC for cellophane-PGMA-grafted membrane doped with phosphoric acid was found 2.33 Â 10 À3 (S cm À1 ) compared to 3.88 Â 10 À2 (S cm À1 ) for Nafion 117. The obtained results are very promising for conducting further investigations taking into consideration the very low price of cellophane compared to Nafion.

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“…13 Similar results have been reported with Nafion membranes modified with other acidic fillers. [14][15][16] Recent papers reported the approach to simultaneously reduce the methanol permeability and increase the proton conductivity of Nafion membranes. 17,18 Hasani-Sadrabadi et al 17 reported that the addition of 2% of bio-functionalized montmorillonite could significantly reduce the methanol permeability of Nafion membranes.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite membranes of Nafion and Fe3O4-anchored and Nafion-functionalized multiwalled carbon nanotubes exhibiting high proton conductivity and low methanol permeability for direct methanol fuel cells

Chang

Lai

et al. 2013

RSC Adv.

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Fe 3 O 4 magnetic nanoparticle-anchored and Nafion-functionalized multiwalled carbon nanotubes (MWCNT-MNP-Nafion) have been prepared and used as a nano-additive for Nafion. The addition of 0.1 wt% of MWCNT-MNP-Nafion to Nafion results in the membranes showing a reduction of methanol permeability from 30.1 6 10 27 cm 2 s 21 to 6.8 6 10 27 cm 2 s 21 and an increase of proton conductivity from 31 mS cm 21 to 78 mS cm 21 . The presence of MWCNT-MNP-Nafion reduces the ionic cluster sizes and decreases the free volume element concentration of the modified Nafion membrane. Both have been verified with small angle X-ray scattering spectroscopy and positron annihilation lifetime spectroscopy and contribute to the reduction of the methanol permeability of the membrane. The increase in the proton conductivity originates from the formation of proton-conducting pathways on the MWCNT bundles. For the membrane fabricated under a magnetic field, its proton conductivity further increases to 85 mS cm 21 due to the magnetically-driven alignment of MWCNT-MNP-Nafion in the Nafion matrix (A-Nafion-NM-0.1). Compared to the plain recast Nafion membrane, the A-Nafion-NM-0.1 membrane has a 15-fold membrane selectivity, an 8.7-fold maximum power density, and a 6.6-fold current density at an operating voltage of 0.4 V in the tests for direct methanol fuel cells (DMFC). The high performance of the membrane in the DMFC tests demonstrates that the MWCNT-MNP-Nafion is a highly efficient additive for the preparation of Nafion-based membranes for DMFCs.

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Preparation of Nafion® nanocomposite membrane modified by phosphoric acid-functionalized 3-APTES

Cited by 8 publications

References 11 publications

Recent Development of Polymer Electrolyte Membranes for Fuel Cells

Recent Development of Polymer Electrolyte Membranes for Fuel Cells

Preparation and characterization of novel grafted cellophane‐phosphoric acid‐doped membranes for proton exchange membrane fuel‐cell applications

Nanocomposite membranes of Nafion and Fe3O4-anchored and Nafion-functionalized multiwalled carbon nanotubes exhibiting high proton conductivity and low methanol permeability for direct methanol fuel cells

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