Ca/Cu Co‐doped SmFeO3 as a Fuel Electrode Material for Direct Electrolysis of CO2 in SOECs ▴
Ca/Cu Co‐doped SmFeO3 as a Fuel Electrode Material for Direct Electrolysis of CO2 in SOECs ▴
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DOI：
10.1002/fuce.201900243
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发表时间：
2020-09
期刊：
影响因子：
2.8
通讯作者：
S. Wang;S. Deng;Z. Hao;X. Hu;Y. Zheng
中科院分区：
文献类型：
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作者：
S. Wang;S. Deng;Z. Hao;X. Hu;Y. Zheng
利用固体氧化物电解池（SOEC）将CO2电化学转化为CO是一种极具吸引力的温室气体可持续利用技术。在这项工作中，Ca和/或Cu掺杂的SmFeO 3钙钛矿材料的Sm 1-xCaxFe 1-yCuyO 3-δ（x = 0，y = 0; x = 0.1，y = 0; x = 0，y = 0.1; x = 0.1，y = 0.1）的形式被评估为SOEC燃料电极用于直接电解CO2。Ca和Cu共掺杂的样品Sm0.9Ca0.1Fe0.9Cu0.1O3-δ（SCFCO）在所有样品中在700 °C的CO2气氛下表现出最高的电导率值15.18 S cm−1。电化学阻抗谱分析表明，与未掺杂样品相比，Ca和Cu共掺杂燃料电极的CO2解离吸附和电荷转移显著增强，极化电阻显著降低。采用SCFCO燃料电极的电解质支撑单电池的电流密度在1.5 V和800 °C的施加电压下高达1.20 A cm−2，比SmFeO 3-δ燃料电极的电流密度高60%。此外，电池显示出令人印象深刻的稳定性的耐久性测试，表明优异的电催化性能和焦化耐受性的SCFCO作为一个有前途的燃料电极材料，用于直接电解CO2。
The electrochemical conversion of CO2 to CO by using solid oxide electrolysis cell (SOEC) is an attractive technology for sustainable utilization of greenhouse gas to chemicals. In this work, Ca and/or Cu doped SmFeO3 perovskite materials in the form of Sm1–xCaxFe1–yCuyO3–δ (x = 0, y = 0; x = 0.1, y = 0; x = 0, y = 0.1; x = 0.1, y = 0.1) are evaluated as SOEC fuel electrode for direct electrolysis of CO2. The Ca and Cu co‐doped sample Sm0.9Ca0.1Fe0.9Cu0.1O3–δ (SCFCO) presents the highest electrical conductivity value of 15.18 S cm−1 among all of the samples under CO2 atmosphere at 700 °C. The electrochemical impedance spectroscopy analysis reveals that the CO2 dissociative adsorption and charge transfer of Ca and Cu co‐doped fuel electrode are significantly enhanced, resulting in the greatly decrease in polarization resistance compared with that of the undoped sample. The current density of an electrolyte‐supported single cell with the SCFCO fuel electrode reaches as high as 1.20 A cm−2 at the applied voltage of 1.5 V and 800 °C, which is 60% higher than that of the SmFeO3–δ fuel electrode. Furthermore, the cell shows an impressive stability for the durability test, indicating the excellent electrocatalysis performance and coking tolerance of SCFCO as a promising fuel electrode material for direct electrolysis of CO2.