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

doi:10.19799/j.cnki.2095-4239.2021.0360

Abstract

Abstract:

The crystal structure and electrochemical performance of Sr deficient Sr_2-_xFe_1.5Mo_0.5O_6-_δ perovskite oxides were systematically investigated. XRD result indicates that the introduce of Sr deficiency increases the unit volume of Sr₂Fe_1.5Mo_0.5O_6-_δ oxide and decreases the initial temperature of oxygen desorption, improving the lattice oxygen activity in Sr₂Fe_1.5Mo_0.5O_6-_δ. Among Sr_2-_xFe_1.5Mo_0.5O_6-_δ oxides, Sr_1.95Fe_1.5Mo_0.5O_6-_δ exhibits the highest conductivity with a maximum value of 38.4 S/cm¹. At 800 ℃, the values of polarization resistance (R_p) of Sr₂Fe_1.5Mo_0.5O_6-_δ, Sr_1.95Fe_1.5Mo_0.5O_6-_δ_{and Sr_1.9Fe_1.5Mo_0.5O_6-_δ are 0.102, 0.070 and 0.096 Ω·cm², respectively, suggesting that Sr_1.95Fe_1.5Mo_0.5O_6-_δ has the best oxygen reduction reaction activity. At fuel cell mode, NiO-YSZ(SL)/NiO-YSZ(FL)/YSZ/SDC/Sr_1.95Fe_1.5Mo_0.5O_6-_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, Sr₂Fe_1.5Mo_0.5O_6-_δ electrode, Sr deficiency

CLC Number:

TM 911.4

Wang YU, Chao SUN, QI Ji, Liuzhen BIAN, Jihua PENG, Jun PENG, Shengli AN. Electrochemical performance of Sr₂_-_xFe_1.5Mo_0.5O₆_-_δ air electrode for solid oxide cell[J]. Energy Storage Science and Technology, 2021, 10(6): 2020-2027.

Figures/Tables 7

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Table 1

n values of various elementary reaction for ORR[28-33]"

n	氧还原反应基元反应	对应的氧还原反应过程
1	$O 2 (g) ? O 2, a d s .$	氧分子在电极表面的扩散和吸附过程
0.5	$O 2, a d s . ? 2 O a d s .$	吸附氧表面解离过程
0.375	$O a d s . + e' + V O, s . . ? O O, s .$	第一个电荷转移过程
0.125	$O O, s . + e' ? O O, s x$	第二个电荷转移过程
0.25	$O a d s . + 2 e' + V O, s . . ? O O, s x$	总电荷转移过程
0	$O O, c x ? O O, e l e c . x$	氧离子在阴极和电解质界面的迁移过程

Table 1

Fig. 6

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Electrochemical performance of Sr₂_-_xFe_1.5Mo_0.5O₆_-_δ air electrode for solid oxide cell

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