Publication date: 10th April 2024
Keywords: Solid Oxide Fuel Cell, electrolysis, electrode, Ba2Co9O14
Among innovative air electrodes for solid oxide cells, the barium cobaltite of formula Ba2Co9O14 (BCO) is promising. It corresponds to the first term of the Ban+1ConO3n+3(Co8O8) series whose structure consists of a stacking of [Co8O8] sandwiched in between [Ba2CoO6] layers. With an electrical conductivity of 100-240 S.cm-1 from 450 to 650°C [1-2], it is competitive to the classical cathode material LSM with sLSM = 50-350 S.cm-1 from 700 to 1000°C [3]. Because of a high thermal expansion coefficient (22.10-6 K), it was studied in composite with Ce0.9Gd0.1O1.95 (CGO). An Area Specific Resistance (ASR) of 0.5 W.cm2 was first reported for a composite containing 30% in weight of CGO [4]. By varying the composition and the electrode thickness of the electrode deposited by screen printing, an ASR of only 0.08 W.cm2 was obtained at 700°C on a symmetric cell made of 50% of BCO and 50% of CGO with a powder prepared by solid state route [5]. These high performances were recently confirmed with an ASR of only 0.3 W.cm2 at 600°C for a composite with Ce0.8Gd0.2O1.9 [6]. Here, to go further in the understanding of the mechanisms involved in the oxygen reduction reaction, a careful study of the electrochemical response and of the performance of this material was carried by impedance spectroscopy combining CNLS-fit and calculation of the distribution function of relaxation time (DRT), varying the experimental conditions: atmosphere, electrode thickness, electrode composition, grain size, interfaces, …
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