Energy Storage Science and Technology ›› 2021, Vol. 10 ›› Issue (6): 2020-2027.doi: 10.19799/j.cnki.2095-4239.2021.0360

• Special issue of hydrogen energy and fuel cell • Previous Articles     Next Articles

Electrochemical performance of Sr2-xFe1.5Mo0.5O6-δ air electrode for solid oxide cell

Wang YU(), Chao SUN, QI Ji, Liuzhen BIAN(), Jihua PENG, Jun PENG, Shengli AN   

  1. Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Instruments, College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
  • Received:2021-07-20 Revised:2021-08-03 Online:2021-11-05 Published:2021-11-03

Abstract:

The crystal structure and electrochemical performance of Sr deficient Sr2-xFe1.5Mo0.5O6-δ perovskite oxides were systematically investigated. XRD result indicates that the introduce of Sr deficiency increases the unit volume of Sr2Fe1.5Mo0.5O6-δ oxide and decreases the initial temperature of oxygen desorption, improving the lattice oxygen activity in Sr2Fe1.5Mo0.5O6-δ. Among Sr2-xFe1.5Mo0.5O6-δ oxides, Sr1.95Fe1.5Mo0.5O6-δ exhibits the highest conductivity with a maximum value of 38.4 S/cm1. At 800 ℃, the values of polarization resistance (Rp) of Sr2Fe1.5Mo0.5O6-δ, Sr1.95Fe1.5Mo0.5O6-δand Sr1.9Fe1.5Mo0.5O6-δ are 0.102, 0.070 and 0.096 Ω·cm2, respectively, suggesting that Sr1.95Fe1.5Mo0.5O6-δ has the best oxygen reduction reaction activity. At fuel cell mode, NiO-YSZ(SL)/NiO-YSZ(FL)/YSZ/SDC/Sr1.95Fe1.5Mo0.5O6-δ delivers a maximum power density of 1459、953, 682 and 420 mW·cm-2, respectively at 850, 800, 750 and 700 ℃, while a current density of -1300 mA·cm-2 was observed at electrolysis cell mode when 20%H2O-H2 was used fuel and static air as oxidant. Finally, the single cell exhibits excellent stability (~100 h) under 800 ℃ and -500 mA·cm-2.

Key words: solid oxide cell, steam splitting, Sr2Fe1.5Mo0.5O6-δ electrode, Sr deficiency

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