A Review on Perovskite-Type LaFeO₃ Based Electrodes for CO₂ Reduction in Solid Oxide Electrolysis Cells: Current Understanding of Structure–Functional Property Relationships

Abstract

Mixed ionic and electronic conductors (MIECs) are being studied extensively as a potential replacement for cermet catalysts in solid oxide cells (SOCs)collectively named for solid oxide fuel cells and solid oxide electrolysis cellsdue to their high activity, great stability, and low cost. Perovskite-type LaFeO3-based catalysts are one of the most promising electrodes for SOCs. This review paper provides an update on the chemical composition–crystal structure–physical property relationships and an understanding of the electrochemical reaction mechanisms in the perovskite-type structure LaFeO3 electrodes. Mechanisms for electrochemical CO2 reduction on the perovskite structure surface and oxygen diffusion are discussed. Furthermore, the electrochemical performance enhancement strategies such as composite electrodes and nanoparticles ex-solution are briefly presented together with industrialization issues, e.g., gas impurities and stability of the interconnecting materials.

Defects and Phase Formation in Non-Stoichiometric LaFeO3: a Combined Theoretical and Experimental Study

“…Within the class of catalytically active ABO 3 perovskites, LaFeO 3 (LFO) is an important representative of a mixed ionic and electronic conductor. LFO can be regarded as a base, or parent material for electrodes in SOFC/SOEC devices, which is discussed extensively in a recent review article by Pidburtnyi et al 19 As compiled there, numerous studies analyze A-and B-site doping of this compound, that is La 1−x A x Fe 1−y B y O 3−δ , aiming at improving its catalytic properties.…”

Boosting the stability of perovskites with exsolved nanoparticles by B-site supplement mechanism

“…Over the past decades, there have been significant advances in promoting exsolution via additional driving forces [10][11][12] . However, challenges remain concerning the stability of P-eNs, especially when being used as a cathode for CO 2 electrolysis in SOEC 13,14 . Although the thermal stability of nanoparticles has been literally enhanced by the exsolution process, the rapid degradation issue still exists at high voltages, which results in a lower energy efficiency [15][16][17] .…”

Electrochemical Activation Applied to Perovskite Titanate Fibers to Yield Supported Alloy Nanoparticles for Electrocatalytic Application

“…Therefore, traditional deposition and infiltration have been widely used to prepare highly active catalysts for CO 2 SOEC but have typically been limited by the anchorage of synthesized species, size, and distribution of nanoparticles. [5,6] Exsolution has been widely employed to produce heterogeneous catalysts with nanoparticles (NPs) supported on parent materials. This time-and cost-effective method has been successfully utilized to form various transition metal nanoparticles, including noble metals [7][8][9] and first-row transition metals.…”