Nafion®/TiO2 composite membranes for PEM fuel cells operating at elevated temperature and reduced relative humidity

Elena Chalkova, Gregory M. Rybka, Mark Valentinovich Fedkin, David J. Wesolowski, Mark G. Roelofs, Serguei Lvov

Research output: Contribution to journalConference article

5 Citations (Scopus)

Abstract

Our approach for elevating the operational temperature of PEM fuel cells above 100°C is to use inorganic particles inside a composite membrane. Inorganic components tend to enhance water retention at elevated temperatures and can reduce undesirable crossover processes. In this study, we compared the properties of the Nafion®/TiO2 composite membranes fabricated from Nafion® polymers with different ion exchange capacity (IEC) - 0.91 meq/g and 1.08 meq/g. The main objective was to find a balance between the membrane IEC and the TiO2 content for optimal fuel cell performance. The membranes were tested for swelling, conductivity, and fuel cell performance under different relative humidity at 120°C. The membranes with IEC of 1.08 meq/g demonstrated better transport properties and much higher performance in a PEMFC. However, excessive swelling of membranes with IEC of 1.08 meq/g caused instability in performance at high current densities and this can be detrimental to membrane durability. copyright The Electrochemical Society.

Original languageEnglish (US)
Pages (from-to)73-82
Number of pages10
JournalECS Transactions
Volume3
Issue number1
DOIs
StatePublished - Dec 1 2006
EventProton Exchange Membrane Fuel Cells 6 - 210th Electrochemical Society Meeting - Cancun, Mexico
Duration: Oct 29 2006Nov 3 2006

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Composite membranes
Fuel cells
Atmospheric humidity
Membranes
Ion exchange
Swelling
Ion exchange membranes
Temperature
Proton exchange membrane fuel cells (PEMFC)
Transport properties
Durability
Current density
Polymers
Water

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Chalkova, Elena ; Rybka, Gregory M. ; Fedkin, Mark Valentinovich ; Wesolowski, David J. ; Roelofs, Mark G. ; Lvov, Serguei. / Nafion®/TiO2 composite membranes for PEM fuel cells operating at elevated temperature and reduced relative humidity. In: ECS Transactions. 2006 ; Vol. 3, No. 1. pp. 73-82.
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Nafion®/TiO2 composite membranes for PEM fuel cells operating at elevated temperature and reduced relative humidity. / Chalkova, Elena; Rybka, Gregory M.; Fedkin, Mark Valentinovich; Wesolowski, David J.; Roelofs, Mark G.; Lvov, Serguei.

In: ECS Transactions, Vol. 3, No. 1, 01.12.2006, p. 73-82.

Research output: Contribution to journalConference article

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AU - Chalkova, Elena

AU - Rybka, Gregory M.

AU - Fedkin, Mark Valentinovich

AU - Wesolowski, David J.

AU - Roelofs, Mark G.

AU - Lvov, Serguei

PY - 2006/12/1

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N2 - Our approach for elevating the operational temperature of PEM fuel cells above 100°C is to use inorganic particles inside a composite membrane. Inorganic components tend to enhance water retention at elevated temperatures and can reduce undesirable crossover processes. In this study, we compared the properties of the Nafion®/TiO2 composite membranes fabricated from Nafion® polymers with different ion exchange capacity (IEC) - 0.91 meq/g and 1.08 meq/g. The main objective was to find a balance between the membrane IEC and the TiO2 content for optimal fuel cell performance. The membranes were tested for swelling, conductivity, and fuel cell performance under different relative humidity at 120°C. The membranes with IEC of 1.08 meq/g demonstrated better transport properties and much higher performance in a PEMFC. However, excessive swelling of membranes with IEC of 1.08 meq/g caused instability in performance at high current densities and this can be detrimental to membrane durability. copyright The Electrochemical Society.

AB - Our approach for elevating the operational temperature of PEM fuel cells above 100°C is to use inorganic particles inside a composite membrane. Inorganic components tend to enhance water retention at elevated temperatures and can reduce undesirable crossover processes. In this study, we compared the properties of the Nafion®/TiO2 composite membranes fabricated from Nafion® polymers with different ion exchange capacity (IEC) - 0.91 meq/g and 1.08 meq/g. The main objective was to find a balance between the membrane IEC and the TiO2 content for optimal fuel cell performance. The membranes were tested for swelling, conductivity, and fuel cell performance under different relative humidity at 120°C. The membranes with IEC of 1.08 meq/g demonstrated better transport properties and much higher performance in a PEMFC. However, excessive swelling of membranes with IEC of 1.08 meq/g caused instability in performance at high current densities and this can be detrimental to membrane durability. copyright The Electrochemical Society.

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