Polyetheretherketone Membranes for Elevated Temperature PEMFCs
| Autor: | Wayne Huang, John W. Weidner, David Olmeijer, Balasubramanian Lakshmanan |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Materials science
Hydrogen General Chemical Engineering Analytical chemistry Proton exchange membrane fuel cell chemistry.chemical_element Conductivity Membrane chemistry Polymer chemistry Electrode Electrochemistry Peek Ionic conductivity General Materials Science Thermal stability Electrical and Electronic Engineering Physical and Theoretical Chemistry |
| Zdroj: | Electrochemical and Solid-State Letters. 6:A282 |
| ISSN: | 1099-0062 |
| DOI: | 10.1149/1.1619647 |
| Popis: | Membrane electrode assemblies (MEAs) made from polyetheretherketone (PEEK) showed excellent fuel cell performance and thermal stability in the presence of substantial CO at elevated temperatures (i.e., 120°C) in proton exchange membrane fuel cells (PEMFCs). For example, the current from a MEA made from PEEK membrane at 0.6 V and 120°C was 0.50 A/cm 2 when run on pure hydrogen and 0.45 A/cm 2 when run on reformate (50% H 2 , 1300 ppm CO, and balance N 2 ). The current density from a MEA made from Nation at 0.6 V and 120°C was 0.61 A/cm 2 when run on pure hydrogen. The main difference between these two MEAs is that the ionic conductivity of the PEEK membrane at 120°C was 3.38 X 10 - 2 S/cm, which is approximately three times lower than Nation. Although it is not surprising that CO tolerance increases with increasing temperature, we are the first to show less than 10% drop in performance with 1300 ppm CO at 120°C. Even though Nafion membranes have higher conductivity, PEEK membranes lasted for 350 h thereby outlasting Nation membranes by seven to eight times. |
| Databáze: | OpenAIRE |
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