Durability of high performance Ni-yttria stabilized zirconia supported solid oxide electrolysis cells at high current density
Durability of high performance Ni-yttria stabilized zirconia supported solid oxide electrolysis cells at high current density
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DOI：
10.1016/j.jpowsour.2014.03.133
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发表时间：
2014-09
影响因子：
9.2
通讯作者：
P. Hjalmarsson;Xiufu Sun;Yi-Lin Liu;Ming Chen
中科院分区：
文献类型：
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作者：
P. Hjalmarsson;Xiufu Sun;Yi-Lin Liu;Ming Chen
我们报道了固体氧化物电解电池（SOEC）的耐久性，该电池具有创纪录的低初始面积比电阻（ASR）和创纪录的低降解率。该电池由ni -钇稳定氧化锆（YSZ）金属陶瓷作为载体和活性燃料电极、YSZ电解质、钆掺杂氧化锆（CGO）互扩散屏障和锶掺杂钴酸镧(LSC) -CGO复合氧电极组成。单元测试在800°C和−−1厘米2转换31%的0.1:0.45:0.45 H2的混合物:水:CO2for大约2700 h,展示200Ω的初始ASR cm2and稳定的降解率≤12 mV每1000人(或0.9%)h。电化学阻抗谱(EIS)被用来研究细胞的原位电化学响应的变化和检索到的数据被deconvolute电阻贡献从生化的过程发生在细胞内。结果表明，在最初的350小时内，燃料电极快速降解，随后部分再激活。发现串联电阻随时间增加，但呈指数衰减。根据详细的电化学结果和解剖后的显微结构分析进行了讨论。
We report the durability of a solid oxide electrolysis cell (SOEC) with a record low initial area specific resistance (ASR) and a record low degradation rate. The cell consists of a Ni–yttria stabilized zirconia (YSZ) cermet as support and active fuel electrode, a YSZ electrolyte, a gadolinia doped ceria (CGO) inter-diffusion barrier, and a strontium doped lanthanum cobaltite (LSC)–CGO composite oxygen electrode. The cell was tested at 800 °C and −1 A cm−2converting 31% of a 0.1:0.45:0.45 mixture of H2:H2O:CO2for approximately 2700 h, demonstrating an initial ASR of 200 mΩ cm2and a steady degradation rate of ≤12 mV (or 0.9%) per 1000 h. Electrochemical impedance spectroscopy (EIS) was used to study in situ changes in the electrochemical response of the cell and the retrieved data was treated to deconvolute resistive contributions from the physiochemical processes occurring within the cell. The results showed rapid initial fuel electrode degradation during the first 350 h followed by partial reactivation. The serial resistance was found to increase with time but in an exponentially decaying behavior. A discussion is made based on the detailed electrochemical results together with post-mortem microstructural analysis.