Function and Characterization of Metal Oxide-Nafion Composite Membranes for Elevated-Temperature H2/O2 PEM Fuel Cells
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- 作者：Kevork T. Adjemian ; Raymond Dominey ; Lakshmi Krishnan ; Hitoshi Ota ; Paul Majsztrik ; Tao Zhang ; Jonathan Mann ; Brent Kirby ; Louis Gatto ; Melanie Velo-Simpson ; Jacklyn Leahy ; Supramanian Srinivasan ; Jay
- 刊名：Chemistry of Materials
- 出版年：2006
- 出版时间：May 2, 2006
- 年：2006
- 卷：18
- 期：9
- 页码：2238 - 2248
- 全文大小：323K
- 年卷期：v.18,no.9(May 2, 2006)
- ISSN：1520-5002
文摘
Metal-oxide-recast Nafion composite membranes were studied for operation in hydrogen/oxygen proton-exchange membrane fuel cells (PEMFC) from 80 to 130 
C and at relative humidities ranging from 75to 100%. Membranes of nominal 125 
m thickness were prepared by suspending a variety of metaloxide particles (SiO2, TiO2, Al2O3, and ZrO2) in solubilized Nafion. The composite membranes werecharacterized using electrochemical, X-ray scattering, spectroscopic, mechanical, and thermal analysistechniques. Membrane characteristics were compared to fuel cell performance. These studies indicateda specific chemical interaction between polymer sulfonate groups and the metal oxide surface for systemsthat provide a good elevated-temperature (i.e., fuel-cell operation above 120 C) performance. Compositesystems that incorporate either a TiO2 or a SiO2 phase produced superior elevated-temperature, low-humidity behavior compared to that of a simple Nafion-based fuel cell. Improved temperature tolerancepermits the introduction of at least 500 ppm CO contaminant in the H2 fuel stream without cell failure,in contrast to standard Nafion-based cells, which fail below 50 ppm of carbon monoxide.
C and at relative humidities ranging from 75to 100%. Membranes of nominal 125 m thickness were prepared by suspending a variety of metaloxide particles (SiO2, TiO2, Al2O3, and ZrO2) in solubilized Nafion. The composite membranes werecharacterized using electrochemical, X-ray scattering, spectroscopic, mechanical, and thermal analysistechniques. Membrane characteristics were compared to fuel cell performance. These studies indicateda specific chemical interaction between polymer sulfonate groups and the metal oxide surface for systemsthat provide a good elevated-temperature (i.e., fuel-cell operation above 120 C) performance. Compositesystems that incorporate either a TiO2 or a SiO2 phase produced superior elevated-temperature, low-humidity behavior compared to that of a simple Nafion-based fuel cell. Improved temperature tolerancepermits the introduction of at least 500 ppm CO contaminant in the H2 fuel stream without cell failure,in contrast to standard Nafion-based cells, which fail below 50 ppm of carbon monoxide.