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

Yusuke Daiko; Lisa Klein; Masayuki Nogami

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

Yusuke Daiko, Lisa Klein, Masayuki Nogami

School of Engineering, Materials Science & Engineering

Research output: Contribution to journal › Conference article

5 Scopus citations

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 language	English (US)
Article number	S8.4
Pages (from-to)	153-158
Number of pages	6
Journal	Materials Research Society Symposium Proceedings
Volume	822
State	Published - Dec 1 2004
Event	Nanostructured Materials in Alternative Energy Devices - San Francisco, CA, United States Duration: Apr 13 2004 → Apr 15 2004

All Science Journal Classification (ASJC) codes

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

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Daiko, Y., Klein, L., & Nogami, M. (2004). Modifying nation with nanostructured inorganic oxides for proton exchange membrane fuel cells. Materials Research Society Symposium Proceedings, 822, 153-158. [S8.4].

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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{\texttrademark} 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{\texttrademark} 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.",

author = "Yusuke Daiko and Lisa Klein and Masayuki Nogami",

year = "2004",

month = dec,

day = "1",

language = "English (US)",

volume = "822",

pages = "153--158",

journal = "Materials Research Society Symposium - Proceedings",

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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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M3 - Conference article

AN - SCOPUS:14944369000

VL - 822

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