Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5149814 | Journal of Power Sources | 2017 | 9 Pages |
Abstract
In this study, methane assisted high temperature steam/CO2 co-electrolysis process is performed on symmetrical cells with a configuration of SFM-SDC/LSGM/SFM-SDC to produce high-quality synthesis gas (syngas, a mixture of H2 and CO). The Nernst potential has been evaluated for solid oxide cells in the methane assisted mode, which is reduced by nearly one order of magnitude through substituting the anode atmosphere from air to methane. The open circuit voltage (OCV) is â0.06 V at 800 °C, and an electrolysis current density of â242 mAcmâ2 has been obtained at 850 °C and 0.3 V. Effects of operating conditions on products composition have been revealed by using the chemical equilibrium co-electrolysis model and HSC software. High-quality syngas with high conversion rate of CO2 to CO as well as ideal H2/CO molar ratio of 2 could be achieved in both electrode sides by adjusting appropriate operating conditions. The short-term cell voltage is slightly fluctuant less than 0.05 V at 850 °C and â120 mAcmâ2, in which condition carbon deposition has been observed in the SFM-SDC anode due to the low O2-/CH4 ratio.
Related Topics
Physical Sciences and Engineering
Chemistry
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Authors
Yao Wang, Tong Liu, Libin Lei, Fanglin Chen,