Realizing Efficient Activity and High Conductivity of Perovskite Symmetrical Electrode by Vanadium Doping for CO<sub>2</sub> Electrolysis
Yan Zhu, Nan Zhang, Wenyu Zhang, Ling Zhao, Yansheng Gong, Rui Wang, Huanwen Wang, Jun Jin, Beibei He
Abstract
Solid oxide electrolysis cells (SOECs) show significant promise in converting CO 2 to valuable fuels and chemicals, yet exploiting efficient electrode materials poses a great challenge. Perovskite oxides, known for their stability as SOEC electrodes, require improvements in electrocatalytic activity and conductivity. Herein, vanadium(V) cation is newly introduced into the B-site of Sr 2 Fe 1.5 Mo 0.5 O 6-δ perovskite to promote its electrochemical performance. The substitution of variable valence V 5+ for Mo 6+ along with the creation of oxygen vacancies contribute to improved electronic conductivity and enhanced electrocatalytic activity for CO 2 reduction. Notably, the Sr 2 Fe 1.5 Mo 0.4 V 0.1 O 6-δ based symmetrical SOEC achieves a current density of 1.56 A cm –2 at 1.5 V and 800 °C, maintaining outstanding durability over 300 h. Theoretical analysis unveils that V-doping facilitates the formation of oxygen vacancies, resulting in high intrinsic electrocatalytic activity for CO 2 reduction. These findings present a viable and facile strategy for advancing electrocatalysts in CO 2 conversion technologies.