In Situ Probing of the Mechanisms of Coking Resistance on Catalyst-Modified Anodes for Solid Oxide Fuel Cells
| Autor: | Samson Yuxiu Lai, Xiaxi Li, Dong Ding, Faisal M. Alamgir, Mingfei Liu, Kevin Blinn, Lawrence A. Bottomley, Mingyang Gong, Meilin Liu, Zhilhong Wang, Jung-Pil Lee, Yunfei Bu |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Materials science General Chemical Engineering Inorganic chemistry Oxide chemistry.chemical_element General Chemistry engineering.material Surface-enhanced Raman spectroscopy 7. Clean energy Catalysis symbols.namesake Nickel chemistry.chemical_compound Hydrocarbon Coating chemistry 13. Climate action Materials Chemistry symbols engineering Raman spectroscopy Carbon |
| Zdroj: | Chemistry of Materials. 27:822-828 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm503852v |
| Popis: | Coking is a major cause of performance degradation of Ni-based anodes in solid oxide fuel cells (SOFCs) powered by carbon-containing fuels. While modification of Ni surfaces using a thin coating of BaO, BaZr0.9Y0.1O3–d (BZY), and BaZr0.1Ce0.7Y0.1Yb0.1O3–d (BZCYYb) was reported to alleviate the problem, the mechanism is yet to be understood. In this study, in situ Raman spectroscopy and surface enhanced Raman spectroscopy (SERS) are used to probe the surface chemistry of BaO, BZY, and BZCYYb. Analyses of the time-resolved spectral features of C–C bonds, −OH groups, and −CO3 groups reveal the interactions between surface functional groups and gas species (hydrocarbon, water steam, and CO2). While the switching from −OH to −CO3 groups is irreversible on BaO surfaces, it becomes reversible on both BZY and BZCYYb surfaces. Although the −OH mediated carbon removal is observed on the surfaces of all three catalysts, the −CO3 is found effective for carbon removal only on the BZCYYb surface. |
| Databáze: | OpenAIRE |
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