Hollow La0.6Sr0.4Ni0.2Fe0.75Mo0.05O3-δ electrodes with exsolved FeNi3 in quasi-symmetrical solid oxide electrolysis cells for direct CO2 electrolysis

Abstract

Symmetrical solid oxide electrolysis cells (Sym-SOECs) have emerged as one of the most attractive cells for direct CO2 electrolysis owing to their structural advantages, low cost, and reversible operability. However, their practical applications are limited due to the non-availability of fuel electrode electrocatalysts with excellent performance. In this study, hollow La0.6Sr0.4Ni0.2Fe0.75Mo0.05O3-δ (LSNFM) electrodes were prepared via a mild molten-salt-assisted approach. Subsequently, quasi-Sym-SOECs were constructed using LSNFM electrodes, where the cathode exsolved FeNi3 nanoparticles to enhance CO2 reduction performance. Compared with Sym-SOECs, the proposed quasi-Sym-SOECs show improved current density of electrolysis and reduced interfacial polarization resistance, which demonstrate the advantages of quasi-Sym-SOECs for CO2 electrolysis.

Keywords

• Hollow structure
• Nanoparticles
• Quasi-symmetrical electrodes
• CO2 electrolysis
• Solid oxide electrolysis cell