1 research outputs found
Atomistic Insights into Medium-Entropy Perovskites for Efficient and Robust CO<sub>2</sub> Electrolysis
Solid oxide electrolysis cells (SOECs) show great promise
in converting
CO2 to valuable products. However, their practicality for
the CO2 reduction reaction (CO2RR) is restricted
by sluggish kinetics and limited durability. Herein, we propose a
novel medium-entropy perovskite, Sr2(Fe1.0Ti0.25Cr0.25Mn0.25Mo0.25)O6−δ (SFTCMM), as a potential electrode material
for symmetrical SOEC toward CO2RR. Experimental and theoretical
results unveil that the configuration entropy of SFTCMM perovskites
contributes to the strengthened metal 3d–O 2p hybridization
and the reduced O 2p bond center. This variation of electronic structure
benefits oxygen vacancy creation and diffusion as well as CO2 adsorption and activation and ultimately accelerates CO2RR and oxygen electrocatalysis kinetics. Notably, the SFTCMM-based
symmetrical SOEC delivers an excellent current density of 1.50 A cm–2 at 800 °C and 1.5 V, surpassing the prototype
Sr2Fe1.5Mo0.5O6−δ (SFM, 1.04 A cm–2) and most of the state-of-the-art
electrodes for symmetrical SOECs. Moreover, the SFTCMM-based symmetrical
SOEC demonstrates stable CO2RR operation for 160 h