A Ca and Fe Co-Doped Layered Perovskite as Stable Air Electrode in Solid Oxide Electrolyzer Cells under High-Current Electrolysis
A Ca and Fe Co-Doped Layered Perovskite as Stable Air Electrode in Solid Oxide Electrolyzer Cells under High-Current Electrolysis
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Ca和Fe共掺杂层状钙钛矿作为高电流电解下固体氧化物电解槽电池中的稳定空气电极
DOI：
10.1016/j.electacta.2017.08.172
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发表时间：
2017-10
影响因子：
6.6
通讯作者：
Caizhi Zhang
中科院分区：
文献类型：
--
作者：
Yifeng Zheng;Hua Yang;Zehua Pan;Caizhi Zhang
本文研究了Ca和Fe共掺杂的SmBaCo 2 O 5 +δ、SmBa0.75Ca0.25CoFeO5+δ（SBCCF）、层状钙钛矿作为固体氧化物电解槽（SOECs）空气电极的电化学性能和稳定性。在具有三电极配置的半电池中，GDC的初始极化电阻RP| SBCCF在800 °C时为0.16 Ω cm 2。在阳极偏压为200 mV时，RP降低到0.03 Ω cm 2，而在阴极偏压为200 mV时，RP增加到0.18 Ω cm 2，表明SBCCF对析氧反应的活性高于氧还原反应。在800 °C下1 A cm− 2下216 h的电解试验期间，GDC的RP| SBCCF在前96 h内增加至0.52 Ω cm 2，并在剩余120 h内保持在0.52 Ω cm 2。相比之下，GDC的RP| LSCF以0.08 Ω cm ~ 2/100 h的速率增加。这一结果表明，SBCCF是SOEC中空气电极的一个有前途的候选材料，可以在高电解电流下稳定运行，这对于实现高产氢率和降低系统成本至关重要。今后的研究将进一步探索提高SBCCF性能的有效方法。
In this study, the electrochemical performance and the stability of Ca and Fe co-doped SmBaCo2O5+δ, SmBa0.75Ca0.25CoFeO5+δ(SBCCF), layered perovskite is examined as the air electrode for solid oxide electrolyzer cells (SOECs). In a half-cell with three-electrode configuration, the initial polarization resistance,RP, of GDC|SBCCF is 0.16 Ω cm2at 800 °C. Under an anodic bias of 200 mV,RPdecreases to 0.03 Ω cm2; however, under cathodic bias of 200 mV,RPincreases to 0.18 Ω cm2, indicating that SBCCF is more active towards oxygen evolution reaction than oxygen reduction reaction. During the electrolysis test under 1 A cm−2at 800 °C for 216 h,RPof GDC|SBCCF increases to 0.52 Ω cm2in the first 96 h and remains at 0.52 Ω cm2for the remaining 120 h. In contrast,RPof GDC|LSCF increases with a rate of 0.08 Ω cm2/100 h at the same time. This result demonstrates that SBCCF is a promising candidate as air electrode in SOECs for stable operation under high electrolysis current, which is critical to achieve high hydrogen production rate and to lower the cost of the system. Effective methods for the improvement of the performance of SBCCF will be developed in future studies.
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