Performance optimization of La0.65Sr0.35MnO3 oxygen electrode based on alternate infiltration method
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摘要: 氢能以其高效、清洁、可再生的优点成为化石能源的有效替代者，而可逆固体氧化物电池(RSOC)既可利用氢气输出电能，也可电解H2O产生氢气，对其研究具有十分重要的意义。本文对RSOC的氧电极进行了研究，在La0.65Sr0.35MnO3(LSM)氧电极的基础上，采用溶液交替浸渍法将Sm0.2Ce0.8O1.9(SDC)和Sm0.5Sr0.5CoO3−δ(SSC)纳米粒子引入LSM氧电极中。800℃时，交替浸渍1次的LSM-SDC-SSC1氧电极的极化电阻为0.49 Ω·cm2，是纯LSM电极(1.12 Ω·cm2)的43%。SDC和SSC的浸渍顺序对电极形貌和性能的影响随着浸渍次数的增加逐渐减弱，交替浸渍2次的LSM-SDC-SSC2氧电极具有最低的极化过电位和极化电阻。800°C时，Ni-(Y2O3)0.08(ZrO2)0.92(YSZ)/YSZ/LSM-SDC-SSC2单电池在固体氧化物燃料电池(SOFC)模式下的最大功率密度为870 mW·cm−2，是纯LSM电池的6.3倍，在固体氧化物电解池(SOEC)模式下的最大电解电流密度为−1150 mA·cm−2，具有良好的可逆电池输出性能。
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关键词:
- 储能 /
- 可逆固体氧化物电池 /
- La0.65Sr0.35MnO3(LSM)氧电极 /
- 交替浸渍法 /
- 复合氧电极
Abstract: Hydrogen energy has become an effective substitute for fossil energy due to its advantages of high efficiency, cleanliness and renewability. Reversible solid oxide cell (RSOC) can use hydrogen to output electricity or electrolyze H2O to produce hydrogen, which has very important research significance. The performance optimization of La0.65Sr0.35MnO3 (LSM) oxygen electrode was studied in this research. Sm0.2Ce0.8O1.9 (SDC) and Sm0.5Sr0.5CoO3−δ (SSC) nanoparticles were introduced into the LSM oxygen electrode. The polarization resistance of the one-time alternate LSM-SDC-SSC1 oxygen electrode at 800°C is 0.49 Ω·cm2, which is 43% of the LSM oxygen electrode. The effect of infiltration sequence of SDC and SSC on the morphology and properties of the electrode decrease with the increase of impregnation time. The two-time alternate LSM-SDC-SSC2 oxygen electrode show the lowest polarization overpotential and polarization resistance. The Ni-(Y2O3)0.08(ZrO2)0.92 (YSZ)/YSZ/LSM-SDC-SSC2 single cell obtain a maximum power density of 870 mW·cm−2 in solid oxide fuel cell (SOFC) mode and a maximum electrolysis current density of −1150 mA·cm−2 in the solid oxide electrolytic cell (SOEC) mode at 800°C, which show good reversible cell performance. -
图 1 La0.65Sr0.35MnO3 (LSM)、LSM-Sm0.2Ce0.8O1.9 (SDC)和LSM-Sm0.5Sr0.5CoO3-δ (SSC)氧电极的截面SEM图像
Figure 1. SEM cross sections images of La0.65Sr0.35MnO3 (LSM), LSM-Sm0.2Ce0.8O1.9 (SDC) and LSM-Sm0.5Sr0.5CoO3-δ (SSC) oxygen electrodes
图 2 交替浸渍后LSM-SSC-SDC和LSM-SDC-SSC氧电极的截面SEM图像
Figure 2. SEM cross section images of alternate infiltrated LSM-SSC-SDC and LSM-SDC-SSC oxygen electrodes
In LSM-SSC-SDCn, LSM-SDC-SSCn, n—Alternate impregnation n times
图 3 SSC和SDC浸渍LSM氧电极的XRD图谱
Figure 3. XRD patterns of the SSC and SDC infiltrated LSM oxygen electrode
图 4 不同温度下LSM、LSM-SDC、LSM-SSC和LSM-SDC-SSC1氧电极的极化阻抗谱图
Figure 4. Impedance spectra of LSM, LSM-SDC, LSM-SSC and LSM-SDC-SSC1 oxygen electrodes at different temperatures
图 5 不同浸渍顺序的氧电极在不同温度下的极化阻抗谱图
Figure 5. Impedance spectra of oxygen electrodes with different infiltration sequences at different temperatures
LSM-SSC-SDC1 and LSM-SSC-SDC2 infiltration SSC first, then SDC, alternate infiltration times are 1 and 2, respectively; LSM-SDC-SSC1 and LSM-SDC-SSC2 infiltration SDC first, then SSC, the alternate infiltration times are 1 and 2 times, respectively
图 6 不同浸渍次数对LSM氧电极性能的影响
Figure 6. Influence of different infiltration time on the performance of LSM oxygen electrode
图 7 不同氧电极对应的单电池在800℃时的固体氧化物燃料电池(SOFC)电化学性能
Figure 7. Electrochemical performance of solid oxide fuel cell (SOFC) with different oxygen electrodes at 800℃
图 8 不同氧电极对应的电解池在800℃时的电解性能
Figure 8. Electrolytic performance of electrolytic cells with different oxygen electrodes at 800℃
表 1 不同浸渍顺序的氧电极在不同温度下的极化电阻
Table 1. Polarization resistances of oxygen electrodes with different infiltration sequences at different temperatures
Oxygen electrode Polarization resistance Rp/(Ω·cm2) 650℃ 700℃ 750℃ 800℃ LSM-SSC-SDC1 3.263 1.536 0.907 0.551 LSM-SSC-SDC2 0.954 0.436 0.247 0.153 LSM-SDC-SSC1 2.639 1.307 0.806 0.481 LSM-SDC-SSC2 0.988 0.372 0.249 0.179 
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