Coke formation and performance of an intermediate-temperature solid oxide fuel cell operating on dimethyl ether fuel
Dimethyl ether (DME) as a fuel of SOFCs is investigated with great attention paid to coke formation over the Ni-YSZ anode. DME is easily decomposed to CH4, CO and H2 at temperatures above 700 °C, with total conversion occurring at 850 °C over the Ni-YSZ catalyst. These data suggest that the DME elec...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Published: |
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/37055 |
| _version_ | 1848754941491937280 |
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| author | Su, C. Ran, R. Wang, W. Shao, Zongping |
| author_facet | Su, C. Ran, R. Wang, W. Shao, Zongping |
| author_sort | Su, C. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Dimethyl ether (DME) as a fuel of SOFCs is investigated with great attention paid to coke formation over the Ni-YSZ anode. DME is easily decomposed to CH4, CO and H2 at temperatures above 700 °C, with total conversion occurring at 850 °C over the Ni-YSZ catalyst. These data suggest that the DME electro-oxidation likely proceeds via an indirect pathway. O2-TPO analysis, laser Raman spectroscopy and SEM-EDX characterizations demonstrate coke formation over Ni-YSZ, which is obvious and become more prevalent at higher temperatures. The introduction of CO2 in the fuel gas decreases the CH4 selectivity and effectively suppresses coke formation above 700 °C. The suppression effect is increasingly apparent at higher temperatures. At 850 °C, the anode still maintains geometric integrity after exposure to DME-CO2 (1:1, volume ratio) under OCV condition. With DME or DME-CO2, the fuel cell power output is comparable to results obtained by operating with 3% water humidified hydrogen. No obvious cell degradation from the anode is observed when operating with DME-CO2, while it is obvious with DME. The introduction of CO2 may be a good choice to suppress the coke formation when operating on DME; however, the proper selection of operation temperature is of significant importance. © 2010 Elsevier B.V. |
| first_indexed | 2025-11-14T08:48:24Z |
| format | Journal Article |
| id | curtin-20.500.11937-37055 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:48:24Z |
| publishDate | 2011 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-370552017-09-13T15:24:46Z Coke formation and performance of an intermediate-temperature solid oxide fuel cell operating on dimethyl ether fuel Su, C. Ran, R. Wang, W. Shao, Zongping Dimethyl ether (DME) as a fuel of SOFCs is investigated with great attention paid to coke formation over the Ni-YSZ anode. DME is easily decomposed to CH4, CO and H2 at temperatures above 700 °C, with total conversion occurring at 850 °C over the Ni-YSZ catalyst. These data suggest that the DME electro-oxidation likely proceeds via an indirect pathway. O2-TPO analysis, laser Raman spectroscopy and SEM-EDX characterizations demonstrate coke formation over Ni-YSZ, which is obvious and become more prevalent at higher temperatures. The introduction of CO2 in the fuel gas decreases the CH4 selectivity and effectively suppresses coke formation above 700 °C. The suppression effect is increasingly apparent at higher temperatures. At 850 °C, the anode still maintains geometric integrity after exposure to DME-CO2 (1:1, volume ratio) under OCV condition. With DME or DME-CO2, the fuel cell power output is comparable to results obtained by operating with 3% water humidified hydrogen. No obvious cell degradation from the anode is observed when operating with DME-CO2, while it is obvious with DME. The introduction of CO2 may be a good choice to suppress the coke formation when operating on DME; however, the proper selection of operation temperature is of significant importance. © 2010 Elsevier B.V. 2011 Journal Article http://hdl.handle.net/20.500.11937/37055 10.1016/j.jpowsour.2010.10.011 restricted |
| spellingShingle | Su, C. Ran, R. Wang, W. Shao, Zongping Coke formation and performance of an intermediate-temperature solid oxide fuel cell operating on dimethyl ether fuel |
| title | Coke formation and performance of an intermediate-temperature solid oxide fuel cell operating on dimethyl ether fuel |
| title_full | Coke formation and performance of an intermediate-temperature solid oxide fuel cell operating on dimethyl ether fuel |
| title_fullStr | Coke formation and performance of an intermediate-temperature solid oxide fuel cell operating on dimethyl ether fuel |
| title_full_unstemmed | Coke formation and performance of an intermediate-temperature solid oxide fuel cell operating on dimethyl ether fuel |
| title_short | Coke formation and performance of an intermediate-temperature solid oxide fuel cell operating on dimethyl ether fuel |
| title_sort | coke formation and performance of an intermediate-temperature solid oxide fuel cell operating on dimethyl ether fuel |
| url | http://hdl.handle.net/20.500.11937/37055 |