Replacing the sluggish oxygen evolution reaction with a favorable methane (CH₄) reforming reaction at the anode of solid oxide electrolysis cells (SOECs) can greatly reduce the electrical demand for CO₂ electroreduction at the cathode. However, the perovskite anode always displays limited activity and stability for CH₄ reforming. Herein, through fine-tuning of the average exsolution energy of the B-site components, high-density CoFe alloy nanoparticles are exsolved on the surface of La_0.6Sr_0.4Ti_0.3Fe_0.5Co_0.2O_3-δ (LSTFC2) anode after reduction, which shows superior anodic CH₄ reforming performance, with a CH₄ conversion of 86.9% and CO selectivity of 90.1% at 800°C. Moreover, stable operation over 1,250 h with a CO selectivity above 95% is achieved. The electrical energy consumption for CO production decreases from 3.46 kWh m⁻³ for conventional SOECs to 0.31 kWh m⁻³ for CH₄-assisted SOECs. This work provides an efficient strategy to thermodynamically boost the cathodic CO₂ electroreduction performance and simultaneously convert CH₄ to syngas at the anode.

在固体氧化物电解池(SOEC)的阳极用有利的甲烷(CH ₄ )重整反应代替缓慢的析氧反应可以大大减少阴极CO ₂电还原的电力需求。然而，钙钛矿阳极对于CH ₄重整的活性和稳定性始终有限。在此，通过微调B位组分的平均溶出能，还原后高密度CoFe合金纳米粒子在La _0.6 Sr _0.4 Ti _0.3 Fe _0.5 Co _0.2 O _3-δ (LSTFC2)阳极表面溶出，其显示出优异的阳极CH ₄重整性能，在800℃下CH ₄转化率为86.9%，CO选择性为90.1%。此外，还实现了超过 1,250 小时的稳定运行，CO 选择性高于 95%。 CO生产的电能消耗从传统SOEC的3.46 kWh m ^-3减少到CH _{4辅助SOEC的0.31 kWh m} ^-3。这项工作提供了一种有效的策略，可以在热力学上提高阴极CO ₂电还原性能，同时在阳极将CH _{4转化为合成气。}