Modifying nation with nanostructured inorganic oxides for proton exchange membrane fuel cells

Yusuke Daiko, Lisa Klein, Masayuki Nogami

Research output: Contribution to journalConference article

5 Citations (Scopus)

Abstract

Nafion, a perfluorosulfonate ionomer, was modified to increase its thermal stability and reduce its methanol permeability. Hybrid membranes of TiO 2-SiO2/Nafion and TiO2·SiO 2·P2O5/Nafion were prepared using an infiltration sol-gel method. Si(OC2H5)4 and Ti(OC4H9)4 were infiltrated into dry Nafion™ membranes, followed by hydrolysis and condensation reactions in first HCl and then NH4OH solutions. The level of inorganic content was controlled by the infiltration time, incorporating up to 50 wt%. Solvent uptake, swelling, water content and proton conductivity were measured at room temperature. Hybrid membranes of TiO2·SiO2/Nafion with ∼30 wt% of infiltrated oxides showed a significantly lower methanol uptake of ∼20wt% and a swelling ratio of 1.15, as compared to those of unmodified Nafion™ membrane, ∼60wt% for methanol uptake and 1.8 for swelling ratio. Proton conductivities for TiO2-SiO2/Nafion hybrid membranes decreased with increasing infiltrated oxides. However, infiltrated membranes treated in phosphoric acid solutions to increase the number of P-OH groups showed a six-fold increase in proton conductivity.

Original languageEnglish (US)
Article numberS8.4
Pages (from-to)153-158
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume822
StatePublished - Dec 1 2004
EventNanostructured Materials in Alternative Energy Devices - San Francisco, CA, United States
Duration: Apr 13 2004Apr 15 2004

Fingerprint

Proton exchange membrane fuel cells (PEMFC)
Oxides
fuel cells
membranes
Membranes
Proton conductivity
protons
oxides
swelling
Swelling
Methanol
methyl alcohol
infiltration
Infiltration
conductivity
Condensation reactions
Ionomers
phosphoric acid
Phosphoric acid
Water content

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "Modifying nation with nanostructured inorganic oxides for proton exchange membrane fuel cells",
abstract = "Nafion, a perfluorosulfonate ionomer, was modified to increase its thermal stability and reduce its methanol permeability. Hybrid membranes of TiO 2-SiO2/Nafion and TiO2·SiO 2·P2O5/Nafion were prepared using an infiltration sol-gel method. Si(OC2H5)4 and Ti(OC4H9)4 were infiltrated into dry Nafion™ membranes, followed by hydrolysis and condensation reactions in first HCl and then NH4OH solutions. The level of inorganic content was controlled by the infiltration time, incorporating up to 50 wt{\%}. Solvent uptake, swelling, water content and proton conductivity were measured at room temperature. Hybrid membranes of TiO2·SiO2/Nafion with ∼30 wt{\%} of infiltrated oxides showed a significantly lower methanol uptake of ∼20wt{\%} and a swelling ratio of 1.15, as compared to those of unmodified Nafion™ membrane, ∼60wt{\%} for methanol uptake and 1.8 for swelling ratio. Proton conductivities for TiO2-SiO2/Nafion hybrid membranes decreased with increasing infiltrated oxides. However, infiltrated membranes treated in phosphoric acid solutions to increase the number of P-OH groups showed a six-fold increase in proton conductivity.",
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Modifying nation with nanostructured inorganic oxides for proton exchange membrane fuel cells. / Daiko, Yusuke; Klein, Lisa; Nogami, Masayuki.

In: Materials Research Society Symposium Proceedings, Vol. 822, S8.4, 01.12.2004, p. 153-158.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Modifying nation with nanostructured inorganic oxides for proton exchange membrane fuel cells

AU - Daiko, Yusuke

AU - Klein, Lisa

AU - Nogami, Masayuki

PY - 2004/12/1

Y1 - 2004/12/1

N2 - Nafion, a perfluorosulfonate ionomer, was modified to increase its thermal stability and reduce its methanol permeability. Hybrid membranes of TiO 2-SiO2/Nafion and TiO2·SiO 2·P2O5/Nafion were prepared using an infiltration sol-gel method. Si(OC2H5)4 and Ti(OC4H9)4 were infiltrated into dry Nafion™ membranes, followed by hydrolysis and condensation reactions in first HCl and then NH4OH solutions. The level of inorganic content was controlled by the infiltration time, incorporating up to 50 wt%. Solvent uptake, swelling, water content and proton conductivity were measured at room temperature. Hybrid membranes of TiO2·SiO2/Nafion with ∼30 wt% of infiltrated oxides showed a significantly lower methanol uptake of ∼20wt% and a swelling ratio of 1.15, as compared to those of unmodified Nafion™ membrane, ∼60wt% for methanol uptake and 1.8 for swelling ratio. Proton conductivities for TiO2-SiO2/Nafion hybrid membranes decreased with increasing infiltrated oxides. However, infiltrated membranes treated in phosphoric acid solutions to increase the number of P-OH groups showed a six-fold increase in proton conductivity.

AB - Nafion, a perfluorosulfonate ionomer, was modified to increase its thermal stability and reduce its methanol permeability. Hybrid membranes of TiO 2-SiO2/Nafion and TiO2·SiO 2·P2O5/Nafion were prepared using an infiltration sol-gel method. Si(OC2H5)4 and Ti(OC4H9)4 were infiltrated into dry Nafion™ membranes, followed by hydrolysis and condensation reactions in first HCl and then NH4OH solutions. The level of inorganic content was controlled by the infiltration time, incorporating up to 50 wt%. Solvent uptake, swelling, water content and proton conductivity were measured at room temperature. Hybrid membranes of TiO2·SiO2/Nafion with ∼30 wt% of infiltrated oxides showed a significantly lower methanol uptake of ∼20wt% and a swelling ratio of 1.15, as compared to those of unmodified Nafion™ membrane, ∼60wt% for methanol uptake and 1.8 for swelling ratio. Proton conductivities for TiO2-SiO2/Nafion hybrid membranes decreased with increasing infiltrated oxides. However, infiltrated membranes treated in phosphoric acid solutions to increase the number of P-OH groups showed a six-fold increase in proton conductivity.

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