Publication date: 10th April 2024
Understanding oxygen exchange kinetics at the surface of solid oxides is crucial for different applications such as fuel cells and sensors… It is known that small amounts of impurities at the surface of mixed conducting oxides can dramatically affect oxygen exchange kinetics. In a recent study [1], it has been showed that the effect of an impurity oxide at the surface of a mixed ionic and electronic conducting oxide (MIEC) can be directly linked to their acidity. Following an acidity scale proposed by Smith [2], it has been showed that basic impurities tend to enhance oxygen surface exchange kinetics, while acidic impurities tend to decrease it. However, this previous study only considered single valence oxides as impurities, to avoid competitive effect of potential redox/catalytic properties of the impurity oxide. This means that the effect of transition metal oxides impurities remains to be determined.
In this work, we studied the effect of the infiltration of transition metal oxides on O2/MIEC surface exchange and adsorption properties. Pr-doped ceria (Pr0.1Ce0.9O2-δ) was used as a host mixed conducting oxide, and a wide range of transition metals oxides were infiltrated on Pr-doped ceria samples to study their effect on oxygen surface exchange kinetics by conductivity relaxation. Variation of reaction rates is discussed with respect to chemical properties of the transition metal oxides, including their acidity (Smith scale), their crystal structure, and redox properties. Adsorption properties were also studied by conductivity measurement coupled to gas phase analysis by mass spectrometry. Adsorption properties are then linked to kinetic performances.
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