Cr doping effect in B-site of La0.75Sr0.25MnO3 on its phase stability and performance as an SOFC anode |
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Authors: | Yao Zheng Ran Ran Zongping Shao |
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Affiliation: | (1) State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing, 210009, China |
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Abstract: | La0.75Sr0.25Cr y Mn1−y O3 (LSCM) (y = 0.0–0.6) composite oxides were synthesized by a complexing process of combining ethylene diamine tetraacetic acid (EDTA) and citrate. X-ray diffraction (XRD), temperature-programmed reduction, electrical conductivity, I–V polarization, and impedance spectroscopy were conducted to investigate the Cr doping effect of La0.75Sr0.25MnO3 on its phase stability and electrochemical performance as a solid-oxide fuel cell (SOFC) anode. The chemical and structural stabilities of the oxides increased steadily with increasing Cr doping concentration, while the electrical conductivity decreased on the contrary. At y ≥ 0.4, the basic perovskite structure under the anode operating condition was sustained. a cell with 0.5-mm-thick scandia-stabilized zirconia electrolyte and La0.75Sr0.25Cr y Mn1−y O3 anode delivered a power density of ∼15 mW·cm−2 at 850°C. |
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Keywords: | solid oxide fuel cells (SOFC) anode materials phase stability perovskite structure |
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