Abstract
The perovskite oxides, La1−xSrxNi0.5Mn0.5O3−δ (LSNM, x = 0.0, 0.05, 0.1, and 0.15), have been evaluated as promising cathodes for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The polycrystalline LSNM nanoparticles are synthesized by a glycine-nitrate combustion method. The Rietveld refinements to X-ray diffraction patterns indicate that LaNi0.5Mn0.5O3−δ (LS0.0NM) is within the mixed Pbnm and R3¯c phases. However, the Sr-doping strategy initially makes the product only be R3¯c phase when x = 0.05, which is considered to be closely relevant to its high oxygen vacancy concentration. The R3¯c phase is also identified in x = 0.1 and 0.15 compounds. The electrochemical performance of LSNM has been performed by the electrochemical impedance spectra technique, and the La0.9Sr0.1Ni0.5Mn0.5O3−δ (LS0.1NM) demonstrates the optimal electrochemical property as evidenced by the lowest area specific resistance (ASR) of 0.12 Ω cm2 at 800 °C. Compared to the cobalt-containing cathode materials, the average thermal expansion coefficient (TEC) of LS0.1NM is about 11.33 × 10−6 K−1, matching well with the prototypical electrolyte La0.9Sr0.1Ga0.8Mg0.2O3−δ below 850 °C. The maximum power densities of the electrolyte-support single cell with the configuration of LS0.1NM|LSGM|NiO-SDC reach 440 and 331 mW cm−2 at 850 and 800 °C, respectively. Therefore, LS0.1NM could be considered as a novel potential cathode candidate for IT-SOFCs.
Published Version
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