Polymer-SnO2 composite membranes

Casper Frydendal Nørgaard, Eivind Morten Skou

Research output: Contribution to conference without publisher/journalPosterResearch

Abstract

When designing sulfonic acid based ionomers, high ion exchange capacity (IEC) comes at the expense of the mechanical properties. With too high IEC, the membrane will excessively swell or even dissolve in water. Therefore a suitable compromise must be found between high charge carrier concentration and adequate mechanical properties. It has been demonstrated that this compromise can be found at higher IEC when the mechanical properties are improved by increasing crystallinity, increasing molecular weight, crosslinking or reinforcement of the membrane by dispersion of interacting particles therein. This work utilizes the latter approach and makes use of particles of tin dioxide (SnO2).

Polymer-SnO2 composite membranes were successfully prepared using an ion-exchange method. SnO2 was incorporated into membranes by ion-exchange in solutions of SnCl2 ∙ 2 H2O in methanol, followed by oxidation to SnO2 in air. The content of SnO2 proved controllable by adjusting the concentration of the ion-exchange solution.

The prepared nanocomposite membranes were characterized by powder XRD, 119Sn MAS NMR, electrochemical impedance spectroscopy, water uptake and tensile stress-strain measurements. For Nafion 117™, addition of about 4 wt% of SnO2 particles provided a substantial increase in elastic modulus with conductivity similar to the parent membrane.

Original languageEnglish
Publication date20. Feb 2011
Number of pages1
Publication statusPublished - 20. Feb 2011
EventAdvances in Materials for Proton Exchange Membrane Fuel Cell Systems 2011 - Pacific Grove, Asilomar Conference Grounds, United States
Duration: 20. Feb 201123. Feb 2011

Conference

ConferenceAdvances in Materials for Proton Exchange Membrane Fuel Cell Systems 2011
CountryUnited States
CityPacific Grove, Asilomar Conference Grounds
Period20/02/201123/02/2011

Fingerprint

Composite membranes
Ion exchange
Polymers
Membranes
Mechanical properties
Sulfonic Acids
Ionomers
Water
Strain measurement
Stress measurement
Charge carriers
Electrochemical impedance spectroscopy
Tensile stress
Crosslinking
Powders
Carrier concentration
Methanol
Nanocomposites
Reinforcement
Elastic moduli

Keywords

  • Nafion
  • Composite
  • SnO2
  • tin dioxide
  • fuel cell

Cite this

Nørgaard, C. F., & Skou, E. M. (2011). Polymer-SnO2 composite membranes. Poster session presented at Advances in Materials for Proton Exchange Membrane Fuel Cell Systems 2011, Pacific Grove, Asilomar Conference Grounds, United States.
Nørgaard, Casper Frydendal ; Skou, Eivind Morten. / Polymer-SnO2 composite membranes. Poster session presented at Advances in Materials for Proton Exchange Membrane Fuel Cell Systems 2011, Pacific Grove, Asilomar Conference Grounds, United States.1 p.
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Nørgaard, CF & Skou, EM 2011, 'Polymer-SnO2 composite membranes', Advances in Materials for Proton Exchange Membrane Fuel Cell Systems 2011, Pacific Grove, Asilomar Conference Grounds, United States, 20/02/2011 - 23/02/2011.

Polymer-SnO2 composite membranes. / Nørgaard, Casper Frydendal; Skou, Eivind Morten.

2011. Poster session presented at Advances in Materials for Proton Exchange Membrane Fuel Cell Systems 2011, Pacific Grove, Asilomar Conference Grounds, United States.

Research output: Contribution to conference without publisher/journalPosterResearch

TY - CONF

T1 - Polymer-SnO2 composite membranes

AU - Nørgaard, Casper Frydendal

AU - Skou, Eivind Morten

PY - 2011/2/20

Y1 - 2011/2/20

N2 - When designing sulfonic acid based ionomers, high ion exchange capacity (IEC) comes at the expense of the mechanical properties. With too high IEC, the membrane will excessively swell or even dissolve in water. Therefore a suitable compromise must be found between high charge carrier concentration and adequate mechanical properties. It has been demonstrated that this compromise can be found at higher IEC when the mechanical properties are improved by increasing crystallinity, increasing molecular weight, crosslinking or reinforcement of the membrane by dispersion of interacting particles therein. This work utilizes the latter approach and makes use of particles of tin dioxide (SnO2). Polymer-SnO2 composite membranes were successfully prepared using an ion-exchange method. SnO2 was incorporated into membranes by ion-exchange in solutions of SnCl2 ∙ 2 H2O in methanol, followed by oxidation to SnO2 in air. The content of SnO2 proved controllable by adjusting the concentration of the ion-exchange solution. The prepared nanocomposite membranes were characterized by powder XRD, 119Sn MAS NMR, electrochemical impedance spectroscopy, water uptake and tensile stress-strain measurements. For Nafion 117™, addition of about 4 wt% of SnO2 particles provided a substantial increase in elastic modulus with conductivity similar to the parent membrane.

AB - When designing sulfonic acid based ionomers, high ion exchange capacity (IEC) comes at the expense of the mechanical properties. With too high IEC, the membrane will excessively swell or even dissolve in water. Therefore a suitable compromise must be found between high charge carrier concentration and adequate mechanical properties. It has been demonstrated that this compromise can be found at higher IEC when the mechanical properties are improved by increasing crystallinity, increasing molecular weight, crosslinking or reinforcement of the membrane by dispersion of interacting particles therein. This work utilizes the latter approach and makes use of particles of tin dioxide (SnO2). Polymer-SnO2 composite membranes were successfully prepared using an ion-exchange method. SnO2 was incorporated into membranes by ion-exchange in solutions of SnCl2 ∙ 2 H2O in methanol, followed by oxidation to SnO2 in air. The content of SnO2 proved controllable by adjusting the concentration of the ion-exchange solution. The prepared nanocomposite membranes were characterized by powder XRD, 119Sn MAS NMR, electrochemical impedance spectroscopy, water uptake and tensile stress-strain measurements. For Nafion 117™, addition of about 4 wt% of SnO2 particles provided a substantial increase in elastic modulus with conductivity similar to the parent membrane.

KW - Nafion

KW - Composite

KW - SnO2

KW - tin dioxide

KW - fuel cell

M3 - Poster

ER -

Nørgaard CF, Skou EM. Polymer-SnO2 composite membranes. 2011. Poster session presented at Advances in Materials for Proton Exchange Membrane Fuel Cell Systems 2011, Pacific Grove, Asilomar Conference Grounds, United States.