The investigation of Cr deposition and poisoning effect on Sr-doped lanthanum manganite cathode induced by cathodic polarization for intermediate temperature solid oxide fuel cell
The investigation of Cr deposition and poisoning effect on Sr-doped lanthanum manganite cathode induced by cathodic polarization for intermediate temperature solid oxide fuel cell
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中温固体氧化物燃料电池阴极极化致锶掺杂锰酸镧阴极Cr沉积及中毒效应研究
DOI：
10.1016/j.electacta.2017.09.112
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发表时间：
2017-11
影响因子：
6.6
通讯作者：
Jian Li
中科院分区：
文献类型：
--
作者：
Li Jun;Yan Dong;Zhang Wenying;Pu Jian;Chi Bo;Jian Li
研究了在750℃下电流密度对掺锶锰酸镧阴极铬中毒的影响。SUS430互连合金的存在使阴极性能急剧下降。铬的沉积不仅存在于靠近电极/电解液界面的LSM表面，也存在于YSZ表面。阴极极化后，在电流密度为400mA/cmμ~2，时间为1200min的条件下，从电极/电解液界面的沉积面积达到4.1mA·−~2。透射电子显微镜结果表明，LSM表面的颗粒为尖晶石结构，这意味着铬物种会与LSM中的Mn发生反应，从而导致LSM阴极的结构损伤。800 mA/cm−2的高极化电流显著地加速了铬的沉积过程，得到了较宽的沉积面积5.9μm。结果表明，铬的沉积发生在电解液/电极界面之外，说明铬的沉积是由化学反应驱动的，而不是由电化学还原驱动的。通过与Mn2+离子的化学反应，诱导铬物种在LSM阴极表面沉积，并在阴极电流作用下向YSZ表面扩散。
The impact of current density on Cr-poisoning of Sr-doped lanthanum manganite cathode is studied at 750 °C. The presences of SUS430 interconnect alloys cause rapid degradation in LSM cathode performance. The Cr deposits can be found not only on the LSM surface close to the electrode/electrolyte interface, but also on the YSZ surface. The deposition area is reach to 4.1 μm from the electrode/electrolyte interface after cathodic polarization with a current density of 400 mA cm−2for 1200 min. TEM results clearly demonstrate that the particles on LSM surface are MnCr2O4spinels, which means that the Cr species would react with Mn from LSM and then lead to the structural damages of LSM cathode. A high polarization current of 800 mA cm−2significantly accelerates Cr deposition process, resulting in a wider deposition area of 5.9 μm on LSM surface. The present results show that the Cr deposition occurs beyond the electrolyte/electrode interface, which reveals that the deposition of Cr species is driven by chemical reaction, not electrochemical reduction. Cr species are induced to deposit on LSM cathode surface by chemical reaction with Mn2+ions, and extend to YSZ surface under cathodic current.
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影响因子：
7.2
作者：
C. Xiong;Wenlu Li;Nanqi Duan;J. Pu;B. Chi;L. Jian
通讯作者：
C. Xiong;Wenlu Li;Nanqi Duan;J. Pu;B. Chi;L. Jian
不同温度烧结LSCF-GDC复合正极的长期Cr中毒效应
影响因子：
3.9
作者：
Bo Chi;Li Jian;Jian Pu;Eric D. Wachsman
通讯作者：
Eric D. Wachsman
影响因子：
4.6
作者：
Duan NQ;Yan D;Chi B;Pu J;Jian L
通讯作者：
Jian L
影响因子：
3.9
作者：
S. Paulson;V. Birss
通讯作者：
S. Paulson;V. Birss
影响因子：
3.9
作者：
S. Jiang
通讯作者：
S. Jiang