Chemical interactions in ionomers and ionomer membranes containing metal particles and ions

Conference · Sat Jul 01 04:00:00 EDT 2000

OSTI ID:20086884

Risen, Jr, W M

Ionomer membranes are employed in PEM fuel cells as the proton conducting element, but they also hold potential for catalytic applications in both hydrogen based and other low temperature fuel cells. In these applications the reactions of H{sub 2}, CO, O{sub 2}, H{sub 2}O and other small molecules with metal-based catalysts are important to consider. Reactions of these species with perfluorocarbonsulfonic acid based ionomers (PFSA), of which Nafions{reg_sign} are prototypical, containing Rh, Ru, Pt and other metal ions and particles are shown. Metal carbonyls form with metal ions that have been reduced in situ to reduced valence ions or to metal particles, by the combination of CO and H{sub 2}O or with H{sub 2} directly. Metal nitrogen complexes also can be formed. In addition, the interactions of dissimilar metal ions leads to distinct species with NO or CO, for example, that are different from the products with either ion separately.

• Research Organization: Brown Univ., Providence, RI (US)
• OSTI ID: 20086884
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
CARBON MONOXIDE
CATALYTIC EFFECTS
ELECTROCATALYSTS
HYDROGEN
HYDROGEN FUEL CELLS
MEMBRANES
PLATINUM
PROTON EXCHANGE MEMBRANE FUEL CELLS
RHODIUM
RUTHENIUM
SOLID ELECTROLYTES
WATER VAPOR