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 Sm_1–xCa_xFe_1–yCu_yO_3–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 Sm_0.9Ca_0.1Fe_0.9Cu_0.1O_3–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 SmFeO_3–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.

中文翻译：

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Ca / Cu共掺杂SmFeO3作为燃料电极材料，可直接电解SOEC中的CO2▴

通过使用固体氧化物电解池（SOEC）将CO ₂电化学转化为CO是一种吸引人的技术，可用于可持续地利用温室气体转化为化学物质。在这项工作中，Ca和/或Cu掺杂了Sm _{1– x} Ca _x Fe _{1– y} Cu _y O _{3– δ}形式的SmFeO ₃钙钛矿材料（x = 0，y = 0；x = 0.1，y = 0 ; x = 0，y = 0.1; x = 0.1，y = 0.1）被评估为直接电解CO的SOEC燃料电极₂。在700°C的CO ₂气氛下，所有样品中的Ca和Cu共掺杂样品Sm _0.9 Ca _0.1 Fe _0.9 Cu _0.1 O _{3– δ}（SCFCO）的电导率值最高，为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CO ₂分解吸附和电荷转移显着增强，导致极化电阻大大降低。带有SCFCO燃料电极的电解质支持的单电池的电流密度高达1.20 A cm ^-2在1.5 V和800°C的施加电压下，比SmFeO _{3– δ}燃料电极的电压高60％。此外，该电池在耐久性测试中显示出令人印象深刻的稳定性，表明SCFCO具有出色的电催化性能和焦化耐受性，可作为直接电解CO ₂的有希望的燃料电极材料。