The intermediate
temperature solid oxide fuel cells (IT-SOFCs)
whose operating temperature ranges from 873 K to 1073 K have attracted
a lot of attention in recent years because of their decreased cost,
improved efficiency, and increased turn on/off switch speed. Nevertheless,
the reduced performance of the cathode when operating at the intermediate
temperature range becomes a challenge, due to the reduced catalytic
activity for oxygen reduction reaction (ORR) on traditional cathode
materials. Ideal cathodes are required to present efficient charge
and oxygen transfer processes. Herein, by constructing heterointerfaces,
we designed a novel composite cathode material PrSrFe0.5Co0.5O4–Pr0.4Sr0.6Fe0.5Co0.5O3 (PSFC214–113). According to the X-ray diffraction patterns and high-resolution
transmission electron microscopy, the PSFC214–113 composite material has been synthesized successfully. As a SOFC
cathode, PSFC214–113 maintains a high electronic
conductivity and excellent chemical compatibility. Compared to single-phase
materials, PSFC214–113 showed significantly lower
electrochemical impedance spectroscopy values and the peak power density
of cell reached a power density of 0.73 W cm–2.
The presence of heterointerfaces promoted electronic and oxygen migration
which, in turn, enhanced the oxygen reduction kinetics and provided
superior electrochemical performance to the material. Our results
reveal that the construction of heterointerfaces is an effective strategy
to enhance the oxygen reduction kinetics for the high-activity cathode.
A series of CoxTi catalysts with different Co/Ti molar ratios (x=0.2, 0.4, 0.6, and 0.8) were prepared by the sol‐gel method and used for N2O decomposition. The catalysts were characterized by XRD, X‐ray photoelectron spectroscopy (XPS), TEM, temperature‐programmed reduction with H2, temperature‐programmed desorption of O2, diffuse reflectance UV/Vis, Raman spectra, and N2 adsorption–desorption measurements. The results indicate that the CoxTi catalysts possess high Brunauer–Emmett–Teller (BET) surface area, more surface Co3+, and even better structural stability than Co3O4 as a result of the strong interactions between Co and Ti oxide. Deactivation occurred over time for the Co3O4 catalyst, however, Co0.6Ti maintains nearly 100 % N2O conversion for at least 30 h. Moreover, the Co0.6Ti catalyst showed much stronger resistance against 1.5 vol. % O2, 2.4 vol. % H2O, or 1.6 vol. % NO in the feed compared with the Co3O4 catalyst. The excellent activity of the Co0.6Ti catalyst can be attributed to the higher amount of surface Co3+ derived from the interaction of the Co and Ti oxide in the CoxTi catalysts.
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