In situ passivation of Fe nanoparticles exsolved from perovskite cathodes through zinc doping for CO₂ electrolysis

Abstract

Efficiently converting CO2 into value-added fuels or chemicals is a significant target for reducing CO2 emissions and achieving carbon neutrality. Solid oxide electrolysis cells (SOECs) are a device where CO2...

Electronic engineering and oxygen vacancy modification of La0.6Sr0.4FeO3−δ perovskite oxide by low-electronegativity sodium substitution for efficient CO2/CO fueled reversible solid oxide cells

“…The conversion of CO 2 using renewable power sources to other fuel/chemical products has gained extensive attention because a higher concentration of CO 2 will bring about undesirable environmental issues like global warming. 1–4 In this situation, reversible solid oxide cells (RSOCs) have emerged owing to favourable thermodynamics and kinetics of CO 2 conversion at high temperatures and reversible operational modes on the same device. 5–8 RSOC construction is generally composed of three sections: the air electrode which is exposed to the air-occurring for oxygen evolution reaction (OER) or the oxygen reduction reaction (ORR), the electrolyte, an oxygen ion conduction medium with almost no electronic conductivity, separating the air electrode and fuel electrode, and the fuel electrode where the crucial CO 2 /CO redox reactions take place.…”

“…30,31 However, it still can not approach the level of performance of Ni-YSZ. To ameliorate this problem, several classical modified methods to enhance the catalytic activities, such as infiltration, 32,33 cation and anion doping, 34–38 in situ exsolution, 3,39–41 and the use of composite electrodes by the self-assembly method 17,36,42–44 have been proposed.…”

Robust Cathode for Efficient CO2 Electrolysis Driven by Entropy Engineering in Solid Oxide Electrolysis Cells

“…Doping inactive low-valent metal ions into A/B sites constitutes an alternative approach, generating more adequate oxygen vacancies at high temperatures. 4,10,17,18 This process not only improves their durability but also enhances CO 2 chemisorption activity and O 2− /e − conductivity for CO 2 electrolysis. To date, various readily reducible low-valent metals, including Ni, 19,20 Cu, 21 Co, 22,23 Ru, 24,25 and Ir, 26 have been incorporated into perovskite Bsites, which form highly dispersed metal, bimetal, or alloy nanoparticles anchored on perovskite surfaces driven by reducing atmospheres or polarization voltages.…”

“…The spectra reveal three species of peaks corresponding to Fe 2+ , Fe 3+ , and Fe 4+ at approximately 709.4, 710.9, and 712.7 eV for Fe 2p 1/2 , respectively. 10 The average oxidation states of PBF, PBCF, PLSBF, PBSCF, and PLSBSCF are 2.75, 2.68, 2.75, 2.73, and 2.69, respectively. Among these, PLSBSCF exhibits slightly lower average valence states of iron.…”

“…Perovskite oxides have garnered increasing interest as potential alternatives to nickel-based cermets due to their good CO 2 RR capabilities and redox stability. Prominent candidates such as Sr 2 Fe 1.5 Mo 0.5 O 6−δ (SFM), La 0.2 Sr 0.8 TiO 3−δ (LST), , and La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3−δ (LSCM) , have been reported as cathode materials. Despite their promise, the CO 2 RR catalytic activity of these perovskites remains insufficient, necessitating further improvements.…”