Influence of Ca-doping in layered perovskite PrBaCo₂O_5+δ on the phase transition and cathodic performance of a solid oxide fuel cell

Abstract

We investigated the phase transition and its correlated electrical and electro-chemical properties of a novel double perovskite series, PrBa1−xCaxCo2O5+δ.

ReBaCo2-xMnxO5+δ (Re: rare earth element) layered perovskites for application as cathodes in Solid Oxide Fuel Cells

“…However, efficient operation of YSZ requires high temperatures, greatly exceeding 800 °C, unless very thin electrolyte layers are utilized [14]. Since lowering of the working temperature of SOFCs brings significant technical and economic benefits, such as reduction of the start-up time, increase of reliability, reduction of heat losses and also possibility of usage of cheaper, steel-based interconnects, research on novel electrolyte materials, which are able to efficiently operate at lowered temperatures has been extensively carried out [15][16][17][18]. Among proposed new compounds, Gd-doped ceria (GDC, Ce1-xGdxO2-δ) and lanthanum gallate-based perovskites (LSGM, La1-xSrxGa1-yMgyO3-δ) are of a special interest, because of their very high ionic conductivity.…”

“…Currently, cobalt-based oxides are undoubtedly considered as the most promising cathode materials among all perovskite-type compounds, due to their high electrocatalytic activity toward ORR and mixed ionic-electronic conductivity with the enhanced ionic component associated with high concentration of the oxygen vacancies, which all together lead to improved electrochemical performance in the IT range [13,15,44]. However, their practical application in SOFC technology is somewhat limited, due to the high thermal expansion coefficient (TEC), incompatible with the ones observed for the commonly used electrolyte materials.…”

NdBaMn2O5+δ layered perovskite as an active cathode material for solid oxide fuel cells

“…The oxygen kinetics in perovskite type structures has been reported showing the significant enhancement of layered types than the disordered perovskites [14]. Furthermore, layered type perovskites [9,[15][16][17][18][19][20][21] have shown interesting findings with a superior power density values [9,17,20] under different atmospheres for application as electrode material in SOFC. The novelty of using layered materials provide more powerful, efficient, stable and durable devices especially for intermediate temperatures IT-SOFCs.…”

High performance and stability of double perovskite-type oxide NdBa0.5Ca0.5Co1.5Fe0.5O5+ as an oxygen electrode for reversible solid oxide electrochemical cell

“…In our previous work, we fabricated cells with PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5 + δ (PBSCF) oxygen electrode achieving good performance [26] . Ca-doping in perovskite oxides can reduce thermal expansion coefficient (TEC), facilitate electrical conductivity and provide higher oxygen vacancy concentrations [27][28][29][30] . Hua et al verified NdBa 0.75 Ca 0.25 Co 1.5 Fe 0.5 O 5 + δ with perfect ORR catalytic performance at both room and elevated temperatures [31] .…”