Stability of Lanthanum Calcium Chromite‐Lanthanum Strontium Manganite Interfaces in Solid Oxide Fuel Cells
Stability of Lanthanum Calcium Chromite‐Lanthanum Strontium Manganite Interfaces in Solid Oxide Fuel Cells
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固体氧化物燃料电池中亚铬酸镧钙-亚锰酸镧锶界面的稳定性
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发表时间：
1996
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通讯作者：
T. Kawada
中科院分区：
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作者：
Haruo Nishiyama;M. Aizawa;H. Yokokawa;T. Horita;N. Sakai;M. Dokiya;T. Kawada
对固体氧化物燃料电池中阴极互连界面的化学稳定性进行了研究。将亚铬酸镧钙和亚锰酸镧锶（一种致密的 10% A 位缺陷型亚锰矿、一种多孔的 10% A 位缺陷型或致密的 1% A 位缺陷型）以选定的电流密度放置在空气和燃料（氢气/水）之间。 300 小时内，界面电导率略有增加。通过扫描电子显微镜/能量色散 X 射线和 X 射线衍射分析检查形态、化学成分和相的变化。致密的 10% A 位缺陷阴极导致氧化锰在空气侧表面和界面处沉淀。多孔阴极增强了亚铬酸镧钙和亚锰酸镧锶之间的化学反应。致密的 1% A 位缺陷阴极最稳定。这些现象已经根据以下方面进行了热力学分析：（i）氧势梯度下的不可逆传质，（ii）钙钛矿相稳定组成区域随氧势函数的变化，以及（iii）液体形成对界面反应的增强作用。
An investigation has been made on the chemical stability of the cathode-interconnect interface in solid oxide fuel cells. Lanthanum calcium chromite and lanthanum strontium manganite (a dense 10% A-site deficient manganite, a porous 10% A-site deficient one or a dense 1% A-site deficient one) were placed between air and fuel (hydrogen/water) at a selected electrical current density. The electrical conductivity across the interfaces was slightly increased for 300 h. Changes in morphology, chemical composition, and phases were examined by scanning electron microscopy/energy dispersive x-ray and x-ray diffractometry analysis. The dense 10% A-site deficient cathode gave rise to the precipitation of manganese oxide at the air-side surface as well as at the interface. The porous cathode enhanced chemical reactions between lanthanum calcium chromite and lanthanum strontium manganite. The dense 1% A-site deficient cathode was most stable. These phenomena have been thermodynamically analyzed in terms of (i) irreversible mass transfer under an oxygen potential gradient, (ii) changes of the stable composition region of the perovskite phases as a function of oxygen potential, and (iii) an enhancing effect of the liquid formation on reactions at interfaces.