Syngas production through CH4-assisted co-electrolysis of H2O and CO2 in La0.8Sr0.2Cr0.5Fe0.5O3-δ-Zr0.84Y0.16O2-δ electrode-supported solid oxide electrolysis cells |
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| Authors: | Changsong Cui Yue Wang Yongcheng Tong Shiwei Wang Chusheng Chen Zhongliang Zhan |
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| Affiliation: | 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Rd., Shanghai, 200050, PR China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, PR China;3. Institute of Advanced Technology, University of Science & Technology of China, Hefei, 230026, PR China;4. CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science & Engineering, University of Science & Technology of China, 96 Jinzhai Rd., Hefei, 230026, PR China;5. Hefei National Laboratory of Physical Science at the Microscale, University of Science and Technology of China, Hefei, 230026, Anhui, PR China |
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| Abstract: | High temperature co-electrolysis of H2O/CO2 allows for clean production of syngas using renewable energy, and the novel fuel-assisted electrolysis can effectively reduce consumption of electricity. Here, we report on symmetric cells YSZ-LSCrF | YSZ | YSZ-LSCrF, impregnated with Ni-SDC catalysts, for CH4-assisted co-electrolysis of H2O/CO2. The required voltages to achieve an electrolysis current density of ?400 mA·cm?2 at 850 °C are 1.0 V for the conventional co-electrolysis and 0.3 V for the CH4-assisted co-electrolysis, indicative of a 70% reduction in the electricity consumption. For an inlet of H2O/CO2 (50/50 vol), syngas with a H2:CO ratio of ≈2 can be always produced from the cathode under different current densities. In contrast, the anode effluent strongly depends upon the electrolysis current density and the operating temperature, with syngas favorably produced under moderate current densities at higher temperatures. It is demonstrated that syngas with a H2:CO ratio of ≈2 can be produced from the anode at a formation rate of 6.5·mL min?1·cm?2 when operated at 850 °C with an electrolysis current density of ?450 mA·cm?2. |
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| Keywords: | Solid oxide electrolysis cells Symmetric cells Methane-assisted electrolysis Syngas Partial oxidation of methane |
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