Quantitative electrochemical contributions of cells and stacked interfacial contacts in solid-oxide electrolysis cells
Quantitative electrochemical contributions of cells and stacked interfacial contacts in solid-oxide electrolysis cells
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固体氧化物电解电池中电池和堆叠界面接触的定量电化学贡献
DOI：
10.1016/j.ijhydene.2016.01.046
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发表时间：
2016-03
影响因子：
7.2
通讯作者：
Lucun Guo
中科院分区：
文献类型：
--
作者：
Yifeng Zheng;Cheng Xu;Wei Guo Wang;Lucun Guo
在H2O/H2比为90/10和750 °C下，研究了固体氧化物电解电池（SOEC）堆中电池、空气电极接触和氢电极接触的定量电化学贡献。电池、氢电极接触和空气电极接触的欧姆电阻分别为电池堆在OCV条件下的欧姆电阻的63.6%、4.8%和30.9%。此外，它们的极化电阻分别占堆叠的极化电阻的93%、2.6%和3.5%。当电池堆在0.8 A cm-2的恒定电解电流密度下运行384 h时，电池、氢电极接触和空气电极接触的电压劣化分别为电池堆总电压劣化的71.5%、8.9%和19.6%。电池堆电阻的变化在很大程度上归因于GDC空气电极分层引起的电池欧姆电阻的增加（Ce0.9Gd0.1O1.95）。然而，施加的电压的堆栈是更敏感的电池极化电阻所造成的Ni颗粒在氢电极，这可能是影响SOEC堆栈退化的主要因素。
Quantitative electrochemical contributions of cell, air electrode contact, and hydrogen electrode contact in the solid-oxide electrolysis cell (SOEC) stack are investigated with an H2O/H2ratio of 90/10 and at 750 °C. Ohmic resistances of cell, hydrogen electrode contact, and air electrode contact are 63.6%, 4.8%, and 30.9%, respectively, of those of the stack under OCV condition. Moreover, their polarization resistances account for 93%, 2.6%, and 3.5% of those of the stack, respectively. When the stack is operated at a constant electrolysis current density of 0.8 A cm−2for 384 h, voltage degradations of cell, hydrogen electrode contact, and air electrode contact are 71.5%, 8.9% and 19.6%, respectively, of the total voltage degradation of the stack. Variation in stack resistance is highly attributed to the increase in cell ohmic resistance caused by air-electrode delamination from the GDC (Ce0.9Gd0.1O1.95). However, the applied voltage of the stack is more sensitive to the cell polarization resistance caused by Ni-particle agglomeration in hydrogen electrode, which may be the major factor affecting SOEC stack degradation.
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