Performances of nickel-doped SmBaCo 2 O 5+δ –Sm 0.2 Ce 0.8 O 1.9 composite cathodes for IT-SOFC

Enhanced oxygen reduction kinetics of IT-SOFC cathode with PrBaCo2O5+δ/Gd0.1Ce1.9O2−δ coherent interface

“…28 Generally, the infiltration route needs multiple steps to achieve considerable loading, which is time-consuming and requires special care. Similar enhancements have been reported for mechanical mixing, including LnBaCo 2 O 5+ δ with SDC, 20,21,24,29 LSCF with SDC 30,31 and La 0.8 Sr 1.2 CoO 4+ δ with GDC. 32 However, direct mechanical mixing is difficult to realize a homogenous distribution of two phases, which will limit the contact interface between two phases.…”

Improved performance of IT-SOFC by negative thermal expansion Sm0.85Zn0.15MnO3 addition in Ba0.5Sr0.5Fe0.8Cu0.1Ti0.1O3−δ cathode

“…At all temperatures, the single cell with BSFCT-20SZM cathode owns a relatively high PPD and the highest OCV. More importantly, the electrochemical performance is even better than that of reported high performance O-SOFCs with Co-based composite cathodes, such as Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ -30SDC [8] and SmBaCo 1.7 Ni 0.3 O 5+δ -20SDC [36]. In addition, the present results clearly show that the introduction of electron blocking layer at anode/electrolyte interface can pronouncedly increase the OCV of O-SOFCs to the value of H-SOFCs [12].…”

A high performance thermal expansion offset composite cathode for IT-SOFCs

“…17) and Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−d , 18 and are the most popular cathode materials to date. However, due to the thermal reduction of Co ions, the associated phase transitions and the thermally activated transition in the spin state of the Co d-orbital electrons, 19 Co-based perovskites usually exhibit a large TEC (above 20 × 10 −6 K −1 ), 20 while the TEC of the electrolyte is much smaller (10-12 × 10 −6 K −1 ) such as Sm 0.2 Ce 0.8 O 2+d (SDC), 21 BaZr 0.1 Ce 0.7 Y 0.2 O 3−d (BZCY) 22 etc. The obvious TEC difference results in poor cathode/electrolyte thermal matching, which seriously affects the long-term stability of SOFCs.…”