High-temperature electrolysis of simulated flue gas in solid oxide electrolysis cells
High-temperature electrolysis of simulated flue gas in solid oxide electrolysis cells
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固体氧化物电解槽中模拟烟气的高温电解
DOI：
10.1016/j.electacta.2018.05.117
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发表时间：
2018-08
影响因子：
6.6
通讯作者：
Siew Hwa Chan
中科院分区：
文献类型：
--
作者：
Yifeng Zheng;Juan Zhou;Lan Zhang;Qinglin Liu;Zehua Pan;Siew Hwa Chan
综合评价了基于电解质支撑的LSCM-GDC/SSZ/LSCF-GDC（LSCM：La 0. 75 Sr 0. 25 Cr 0. 5 Mn 0. 5 O3-δ）单电池的固体氧化物电解槽（SOEC）烟气电解的可行性。通过电流密度-电压曲线（I-V）和电化学阻抗谱（EIS）表征了SOEC的电化学性能。结果证实LSCM-GDC燃料电极在烟道气气氛中是化学稳定的。结果还表明，烟气中浓度为15 ppm的模拟SO2在电解电流密度为10.2 A cm-2时对电池的影响可以忽略不计。烟气中的O2增加了燃料电极中的电解活性，从而提高了SOEC电解烟气的效率。烟气中SO2和O2的共存可以提高SOEC电解的活性。SOEC单电池在800 °C、OCV下的总电阻为2.21 Ω cm 2，表明SSZ电解质支撑的SOEC可用于SO2和O2烟气的有效SOEC电解。在800 °C、电流密度为0.5 A cm− 2的条件下，该电解槽在1.201 V的电压下稳定电解烟气中的SO2和O2超过100 h。事后分析表明，所有电池组件的微观结构在SOEC长期耐久性测试后是稳定的。
The feasibility of the solid oxide electrolysis cell (SOEC) electrolysis of flue gas based on an electrolyte-supported LSCM-GDC/SSZ/LSCF-GDC (LSCM: La0.75Sr0.25Cr0.5Mn0.5O3-δ) single cell is comprehensively evaluated. Current density-voltage curves (I-V) and electrochemical impedance spectroscopy data (EIS) are recorded to characterize the electrochemical performance of SOEC. The results confirmed that the LSCM-GDC fuel electrode is chemically stable in the flue gas atmosphere. The results also showed that simulated SO2with concentration of 15 ppm in the flue gas has a negligible influence on the cell at an electrolysis current density of ∼0.2 A cm−2. The O2in the flue gas increases the electrolysis activity in the fuel electrode, thereby improving the efficiency of the SOEC electrolysis of flue gas. The co-existence of SO2and O2in flue gas can increase the electrolysis activity of SOEC electrolysis. The total resistance of the SOEC single cell at 800 °C under OCV is 2.21 Ω cm2, indicating that the SSZ-electrolyte-supported SOEC can be practically used for the effective SOEC electrolysis of flue gas containing SO2and O2. The cell showed a stable voltage of 1.201 V for more than 100 h for the electrolysis of flue gas with SO2and O2at a current density of 0.5 A cm−2and at a temperature of 800 °C. The post-mortem analysis showed that the microstructures of all cell components are stable after the SOEC long-term durability test.
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