Tuning the Co/Fe ratio in BaCo_xFe_0.8−xZr_0.1Y_0.1O_3−δ, a promising triple ionic and electronic conducting oxide, to boost electrolysis and fuel cell performance

Abstract

The triple conducting oxide BaCo0.4Fe0.4Zr0.1Y0.1O3-δ (BCFZY4411), which accommodates simultaneous transport of protons, oxygen ions, and p-type electronic carriers, has been intensively investigated in recent years as a high-performance positive electrode...

Effect of NiO Addition on the Sintering and Electrochemical Properties of BaCe0.55Zr0.35Y0.1O3-δ Proton-Conducting Ceramic Electrolyte

“…Currently, most PCFCs use cobalt-rich cathodes, such as LSCF [ 30 ], BSCF [ 5 , 31 ], BCFZY [ 32 , 33 ], and PNC [ 34 ], etc. Thermal compatibility is a critical issue with these cobalt-rich cathodes, which typically exhibit high thermal expansion coefficient (TEC) values within the operating temperature range.…”

Improving tubular protonic ceramic fuel cell performance by compensating Ba evaporation via a Ba-excess optimized proton conducting electrolyte synthesis strategy

“…An Au paste coating was also applied to the anode side and four Ag grid-lines were painted at about 90 • interval using a silver paste (DAD-87), and then baked at 200 • C for an hour on a hotplate to ensure adhesion. The full cell assembly was mounted on an alumina oxide tube and sealed using Cerambond (552-VFG), and it followed the testing direction of the previous study [27]. Briefly, the cell was operated under high-purity hydrogen as the fuel and humidified (3 vol% water vapor) synthetic air (21% O 2 + 79% N 2 ) as the oxidant.…”

A review of progress in proton ceramic electrochemical cells: material and structural design, coupled with value-added chemical production

“…84 Moreover, the substitution of Co and Fe in BCFZY4411 is a critical factor, as the Co/Fe ratio determines the oxygen ion transport and oxygen vacancy content, which further affects the equilibrium and transport properties of hybrid O 2À /H + defects. 85 Compared to Fe-rich composites such as BaCo 0.1 Fe 0.7 Zr 0.1 Y 0.1 O 3Àd (BCFZY1711) and BaCo 0.2 Fe 0.6 Zr 0.1 Y 0.1 O 3Àd (BCFZY2611), Co-rich composites (e.g., BaCo 0.7 Fe 0.1 Zr 0.1 Y 0.1 O 3Àd (BCFZY7111) and BaCo 0.6 Fe 0.2 Zr 0.1 Y 0.1 O 3Àd (BCFZY6211)) exhibit higher intrinsic oxygen ion diffusion and appropriate surface exchange kinetics. 85 Simultaneously, the 5% Mg substitution at the B-site of BCFZY4411 resulted in a lower total metal oxidation state, consequently increasing its oxygen vacancy concentration and enhancing the catalytic activity of oxygen-related reactions.…”

“…85 Compared to Fe-rich composites such as BaCo 0.1 Fe 0.7 Zr 0.1 Y 0.1 O 3Àd (BCFZY1711) and BaCo 0.2 Fe 0.6 Zr 0.1 Y 0.1 O 3Àd (BCFZY2611), Co-rich composites (e.g., BaCo 0.7 Fe 0.1 Zr 0.1 Y 0.1 O 3Àd (BCFZY7111) and BaCo 0.6 Fe 0.2 Zr 0.1 Y 0.1 O 3Àd (BCFZY6211)) exhibit higher intrinsic oxygen ion diffusion and appropriate surface exchange kinetics. 85 Simultaneously, the 5% Mg substitution at the B-site of BCFZY4411 resulted in a lower total metal oxidation state, consequently increasing its oxygen vacancy concentration and enhancing the catalytic activity of oxygen-related reactions. 86 For PrBa 0.5 Sr 0.5 Co 2Àx Fe x O 5+d materials, increasing the substitution of Co with Fe at the B-site generates a phase transition from the layered perovskite (LP) (P4/mmm) structure to the randomly ordered perovskite (Pm% 3m) structure.…”