Abstract
La0.2Sr0.25Ca0.45TiO3 is a carefully selected composition to provide optimal ceramic and electrical characteristics for use as an anode support in solid oxide fuel cells. In this study we focus on the process optimization and characterization of A-site deficient perovskite, La0.2Sr0.25Ca0.45TiO3 (LSCTA-), powders prepared via a solution method to be integrated into the SOFC anode supports. A Pechini method has been applied to successfully produce single phase perovskite at 900 °C. Processing conditions have been modified to yield a powder that displays a similar sintering profile to commercial yttria stabilised zirconia. The conductivity behavior of porous bodies under redox has been investigated showing a 2 stage process in both oxidation and reduction cycling that exhibits strong reversibility. For the reduction process, addition of impregnated ceria reduces the onset delay period and increases the apparent rate constant, k values, by 30–50% for both stages. The addition of ceria had less influence on the oxidation kinetics, although the conductivity values of both oxidised and reduced porous bodies were enhanced.
Highlights
The state of the art anode material for solid oxide fuel cells (SOFCs) is the Ni/yttriastabilized zirconia (YSZ) cermet due to its low cost, good catalytic activity, high ionic and electronic conductivity and chemical and mechanical compatibility with other cell components.[1]
The state of the art anode material for solid oxide fuel cells (SOFCs) is the Ni/YSZ cermet due to its low cost, good catalytic activity, high ionic and electronic conductivity and chemical and mechanical compatibility with other cell components.[1]. It has some inherent drawbacks: upon redox cycling, anode degradation occurs due to large and facile Ni to NiO volume change, low tolerance to sulphur limits the application of this anode in SOFC conditions and its high catalytic activity causes carbon deposition when hydrocarbons are used as fuels, without excess steam being present
There is a demand to design alternative anode systems to overcome the limitations of Ni/YSZ cermet without compromising the electrical conductivity and stability of the SOFC anode
Summary
The state of the art anode material for solid oxide fuel cells (SOFCs) is the Ni/YSZ cermet due to its low cost, good catalytic activity, high ionic and electronic conductivity and chemical and mechanical compatibility with other cell components.[1]. At high operating temperatures, the catalytic active surface area decreases due to agglomeration and sintering of Ni.[2] All of these factors affect the performance and long term stability of SOFCs. there is a demand to design alternative anode systems to overcome the limitations of Ni/YSZ cermet without compromising the electrical conductivity and stability of the SOFC anode. There is a demand to design alternative anode systems to overcome the limitations of Ni/YSZ cermet without compromising the electrical conductivity and stability of the SOFC anode In this context, perovskite oxides appear to be the suitable anode candidates as they offer suitable properties.[3,4,5] Perovskite oxides have a general formula of ABO3 where A and B cations are 6-fold and 12-fold coordinated to the oxygen anions, respectively. The A-site is usually occupied by alkaline earth and/or rare earth metal ions while small transition metal ions
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