掺杂不同价态离子的SrFeO<sub>3-<i>δ</i></sub>钙钛矿氧化物的电化学性能

doi:10.11896/cldb.18050244

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Abstract Samples of SrFe_0.9M_0.1O_3-δ(M=Zn, Ga, Sn, Nb, W) were synthesized via the solid-phase reaction. The crystal structure, EDS, chemical compatibility, conductivity and electrochemical properties as cathode materials for solid oxide fuel cell were also discussed. The XRD patterns reveal that perovskite structure of SrFeO_3-δ is well stabilized by doping metal ions Zn²⁺, Ga³⁺, Sn⁴⁺, Nb⁵⁺ and W⁶⁺, and all the samples show a single perovskite structure. No any impurity peaks are observed in the XRD patterns. The EDS pattern shows that the synthesized samples have a good chemical uniformity. The facts show that the SrFe_0.9M_0.1O_3-δ(M=Zn, Ga, Sn, Nb, W) cathode have a good chemical compatibility with LSGM electrolyte at temperatures below 950 ℃. With the increase of valence state of doped ions, the maximum conductivity values gradually reduce. The SrFeO_3-δ cathodic polarization resistance of doping metal ions Zn²⁺, Ga³⁺, Sn⁴⁺, Nb⁵⁺ and W⁶⁺ is measured at 800 ℃, the polarization resistance of SrFe_0.9Zn_0.1O_3-δ sample is the smallest. The maximum power density of single cells with SrFe_0.9M_0.1O_3-δ(M=Zn, Ga, Sn, Nb, W) as cathode and LSGM as electrolyte decreases with the increase of valence state of doping ions at 800 ℃. The peak power density of SrFe_0.9Zn_0.1O_3-δ sample reaches 593 mW·cm^-2 at 800 ℃.

Key words： solid oxide fuel cell perovskite oxide electrical conductivity cathode polarization resistances

Published: 19 June 2019

CLC number:

TM911

Fund:This work was supported by Science and Technology Research Project of the Education Department of Jilin Province (2016167).

About author:: Xiuling Yureceived her M.S. degree in physics from Shenyang Normal University in 2005 and received her Ph.D. degree in condensed matter physics from Jilin University in 2014. She is currently an associate professor in Jilin Agricultural University. Her research inte-rests are cathode materials for intermediate temperature solid oxide fuel cells, preparation and application of flexible supercapacitors.

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Cite this article:

YU Xiuling,LIANG Xuemei,LI Xue. Electrochemical Properties of SrFeO_3-δ Perovskite Type Oxides Doped with Different Valence of Ion[J]. Materials Reports, 2019, 33(14): 2305-2310.

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http://www.mater-rep.com/EN/10.11896/cldb.18050244 OR http://www.mater-rep.com/EN/Y2019/V33/I14/2305

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