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article
Structural, morphological, and electrochemical behavior of titanium-doped SrFe1-xTixO3-δ (x = 0.1–0.5) perovskite as a cobalt-free solid oxide fuel cell cathode
Abstract
itanium, Ti-doped SrFe1-xTixO3-δ (x = 0.1–0.5) perovskite-structured ceramics were synthesized via solution combustion. The structural, morphological, and electrochemical behaviors of the as-synthesized materials were investigated to determine the applicability of SrFe1-xTixO3-δ as a cobalt-free cathode material for intermediate-temperature solid oxide fuel cells. X-ray diffraction analysis confirmed the formation of a single-phase cubic perovskite structure. The unit volume of this perovskite structure increased as the amount of Ti dopant increased. Morphological analysis revealed that the porosity of the SrFe1-xTixO3-δ perovskite cathode film was inversely proportional to the amount of Ti dopant. The cathode SrFe0·9Ti0·1O3-δ film exhibited a high porosity of 24.74 ± 0.52%, a low but acceptable hardness value of 0.70 ± 0.01 GPa and an area specific resistance of 0.57 Ω cm2. These results suggested that cobalt-free SrFe1-xTixO3-δ cathode was still not good enough to be compared with the existing cobalt-containing cathode such as lanthanum strontium cobalt ferrite. But, the results obtained from this work can be considered as a major turning point as the literature works on SrFe1-xTixO3-δ cathode showed excellence electrochemical performance. The contradict result between the present and past studies proved that the use of SrFe1-xTixO3-δ cathode is worthy of being studied into details to confirm its capability.