In Situ Exsolved Bimetallic Nanoparticles on Double Perovskite for Efficient CO <sub>2</sub> Electrolysis and Synergistic Methane Reforming in SOEC
Xiaoyu Wang, Yangyang Zhao, Juntao Feng, Pei Wang, Xingchen Feng, Kai Yang, Xifeng Ding
Abstract
Abstract Solid oxide electrolysis cells (SOECs) are promising energy conversion devices for the CO 2 reduction reaction (CO 2 RR). However, their applications are limited by sluggish reaction kinetics and poor durability of the electrode. Herein, a hetero‐structured (PrBa) 0.95 Fe 1.5 Cu 0.5 O 6‐δ with in situ formed FeCu bimetallic nanoparticles (FeCu@PB95FC) is designed to enhance CO 2 electrolysis and CH 4 reforming in SOECs. The current density of the cell with FeCu@PB95FC cathode achieves a remarkable current density of 1044.74 mA cm −2 at 800 °C and 1.5 V for pure CO 2 electrolysis, with a CO production rate of 6.4 mL min −1 cm −2 and a Faraday efficiency of 95.23%. The superior electrocatalytic activity is attributed to the exsolved nanoparticles promoting electron transfer and additional oxygen vacancies generated within the perovskite substrate, providing numerous metal‐oxide interfaces for gas adsorption and electrolysis. Furthermore, to reduce energy consumption of CO 2 electrolysis while generating value‐added products, the symmetrical cell (FeCu@PB95FC|LSGM|FeCu@PB95FC) is synthesized, achieving a current density of 1.54 A cm −2 , alongside high syngas production (CO: 4.49 mL min −1 cm −2 ; H₂: 6.53 mL min −1 cm −2 ). This work offers a synergistic strategy for designing robust electrodes for efficient CO 2 conversion and methane utilization in SOECs, advancing sustainable energy technologies.