Chemical durability of Solid Oxide Fuel Cells: Influence of impurities on long-term performance
| Autor: | Chie Uryu, Run-Ru Liu, Kazunari Sasaki, Katsumi Yokomoto, Kohei Ito, Yusuke Shiratori, Michihisa Koyama, Eiji Yuki, Tomoo Yoshizumi, Daisuke Minematsu, Teppei Ogura, Kengo Haga, Toshihiro Oshima |
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| Rok vydání: | 2011 |
| Předmět: |
chemistry.chemical_classification
Materials science Hydrogen Renewable Energy Sustainability and the Environment Inorganic chemistry Oxide Energy Engineering and Power Technology chemistry.chemical_element Overpotential Anode chemistry.chemical_compound Hydrocarbon chemistry Impurity Coal gas Electrical and Electronic Engineering Physical and Theoretical Chemistry Chemical decomposition |
| Zdroj: | Journal of Power Sources. 196:9130-9140 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2010.09.122 |
| Popis: | Because of the fuel flexibility of Solid Oxide Fuel Cells (SOFCs), various types of fuels may be applied directly or via a simple reforming process, including hydrocarbons, alcohols, coal gas, biogas, besides hydrogen. However, various types of minor constituents in practical fuels and/or from the system components can cause chemical degradation of SOFCs, such as anode and cathode poisoning phenomena. In this study, we compare the influence of various external impurities, including sulfur, chlorine, phosphorus, boron, and siloxane for anodes, and H 2 O and SO 2 for cathodes, on SOFC performance to have a general overview on long-term chemical durability of SOFCs. Chemical compatibility of Ni with foreign species has also been thermochemically considered. Using common model cells, the stability of cell voltage, electrode overpotential, and ohmic loss up to 3000 h has been experimentally examined for H 2 -based fuels, for hydrocarbon-based fuels, and for partially pre-reformed CH 4 -based fuels. Increase in degradation rate by impurities was verified for various operational parameters. Impurity poisoning mechanisms are discussed for each specific impurity. |
| Databáze: | OpenAIRE |
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