Publication date: 10th April 2024
In contrast to main solid oxide cell air electrodes whose structures derived from the perovskite, Ca3Co4O9+d (CCO) and Ba2Co9O14 (BCO) are built upon CoO2 layers of CdI2 type. Despite they low oxide ion conductivity, there are currently considered as promising solid oxide cell electrodes not only for Solid Oxide cells but also for Protonic Ceramic Cells. In composite with Ce0.9Gd0.1O1.95 (CGO), an Area Specific Resistance of only 0.08 ohm.cm2 was obtained at 700°C on a symmetric cell made of 50% of BCO and 50% of CGO [1]. These high performances were recently confirmed by Araùjo et al who reported an ASR of only 0.3 ohm.cm2 at 600°C for a composite with Ce0.8Gd0.2O1.9 [2]. In case of CCO, the ASR at 700°C was decrease from 4 ohm.cm2 at 700°C for the pure compound prepared by solid state route to 0.35 ohm.cm2 when combined with CGO after optimisation of the microstructure and electrode thickness [3]. The performances were even increased when a strontium doped composition was used, reaching 0.15 W.cm2 for the ASR at 700°C. Thanks to a thermal expansion coefficient for CCO in the same order of magnitude than those of the electrolytes currently used for the application, a very good electrolyte/electrode interface was noticed after full cell test, making this material promising not only in terms of performances but also durability. Here, the state of the art of these two promising electrodes will be presented.
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