Effect of A-site doping with Gd3+ on Properties of Sr2Fe1.5Mo0.5O6-δ
), Abstract
Sr2−xGdxFe1.5Mo0.5O6−δ (x=0, 0.1, 0.2, 0.3, 0.4) (SGxFM) powders as anode of solid oxide fuel cell (SOFC) were synthesized by using a sol-gel method. Electrolyte supported SOFC single cell was assembled. XRD, XPS, SEM, TGA and electrochemical test were used to characterize the samples. The anode materials exhibited single phase double perovskite structure. With increasing concentration of Gd3+, the XRD diffraction peak shifted, which indicated that Gd3+ has well incorporated into Sr2Fe1.5Mo0.5O6−δ. SG0.1FM had higher Fe2+/Fe3+ and Mo5+/Mo6+ ratios. According to TGA results, SG0.1FM showed the highest oxygen loss, indicating that it has the highest concentration of oxygen vacancy. The electrode material presented a loose and porous microstructure, while the electrolyte was dense. The cell was tested at 550–800 ℃, with H2 as fuel and static air as oxidant. At 800 ℃, the anode had a polarization impedance of 0.021 Ω·cm2, while the maximum power density reached 264 mW·cm−2. Therefore, Gd3+ ion doping can improve the performances of SFM.
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