Ni-GDC and Ni-YSZ electrodes operated in solid oxide electrolysis and fuel cell modes

Anion Fluorine-Doped La0.6Sr0.4Fe0.8Ni0.2O3−δ Perovskite Cathodes with Enhanced Electrocatalytic Activity for Solid Oxide Electrolysis Cell Direct CO2 Electrolysis

“…The cathode plays a significant role in the sandwich structure of SOECs for the electrocatalysis of gases. While the state-of-the-art material Ni–YSZ (nickel–yttria-stabilized zirconia) has been widely studied as a SOEC cathode for CO 2 and/or H 2 O electrolysis, − some critical challenges still exist in CO 2 electrolysis. For instance, susceptibility to impurities, easy agglomeration, deactivation at high overpotentials, and especially redox instability are the bottlenecks of the Ni–YSZ cathode.…”

The Effect of Sintering Temperature on the Phase Composition, Microstructure, and Mechanical Properties of Yttria-Stabilized Zirconia

“…It is critically important to manufacture materials resistive to the aggressive operating environment [35][36][37][38] to avoid microstructure degradation [39][40][41][42]. Therefore, along with strength and tribology tests of materials as the most popular methods for diagnosing their load-bearing capacity, the indentation test, known as the simplest mechanical method [39,43], is widely used.…”

Non-perovskite Structural CaFe2O4 with Matched Thermal Expansion Coefficients Exhibiting High Performance for CO2 Electroreduction

“…Therefore, it is essential to improve the catalytic activity of the cathode to enhance the cell performance. Ni-based cermets, such as Ni-GDC (Gd 2 O 3 -doped CeO 2 ) and Ni-YSZ (Y 2 O 3 -stabilized ZrO 2 ), widely used as cathodes of SOECs, have the advantages of low costs and high electrochemical activities. − However, Ni-based cathodes face various problems, such as Ni oxidation, Ni coarsening, and carbon deposition, thus threatening their long-time operation. − LaCrO 3 - and SrTiO 3 -based perovskite oxides with matching thermal expansion coefficients (TECs) to other components of SOECs were considered as potential cathodes for CO 2 electroreduction in SOECs, − while their electrochemical activity still needs to be significantly improved. − Therefore, Fe-, Co-, and Ni-based perovskite oxides were developed, such as La 0.6 Sr 0.4 Fe 0.8 Ni 0.2 O 3−δ F 0.1 , La 0.6 Sr 0.4 Co 0.5 Ni 0.2 Mn 0.3 O 3−δ , La 0.66 Ti 0.8 Fe 0.2 O 3−δ , and Sr 2 Fe 1.35 Mo 0.45 Co 0.2 O 6−δ . − In these perovskite oxides, the easily reducible metal elements (Fe, Co, and Ni) are exsolved from perovskite bulk under a H 2 -containing atmosphere or a reducing potential to form metal nanoparticles on perovskite surfaces. − The interfaces of metal nanoparticles/perovskite have been identified to be highly active toward CO 2 electroreduction because the metal nanoparticles can strengthen the adsorption of intermediates and lower the CO 2 dissociation barriers. Meanwhile, the perovskite substrate with high oxygen ionic conductivity facilitates the diffusion of oxygen ions from the metal nanoparticles/perovskite interfaces to electrolyte. − …”