Electrodeposition of Ni ∕ LaCrO3 Composite Coatings for Solid Oxide Fuel Cell Stainless Steel Interconnect Applications
Electrodeposition of Ni ∕ LaCrO3 Composite Coatings for Solid Oxide Fuel Cell Stainless Steel Interconnect Applications
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DOI：
10.1149/1.2835204
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发表时间：
2008-04
影响因子：
3.9
通讯作者：
N. Shaigan;D. Ivey;Weixing Chen
中科院分区：
文献类型：
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作者：
N. Shaigan;D. Ivey;Weixing Chen
目前在固体氧化物燃料电池中使用的铁素体不锈钢互连件的主要缺点是由于钢的高温氧化和形成导电性差的氧化铬层而导致的导电性损失。为了克服这个问题，开发、研究和优化了由镍基中分散的导电LaCrO 3颗粒组成的复合涂层。共沉积使用瓦特镍电镀浴含有悬浮的LaCrO 3颗粒。最大化涂层中颗粒体积分数的最佳条件被确定为40-50 mA/cm 2的电流密度，20 g/L的颗粒负载在浴中，pH 4，和颗粒悬浮在镀浴中通过高架叶轮。对于最佳条件，涂层中的颗粒体积分数等于1.35体积%。氧化实验表明，导电颗粒嵌入氧化层中，氧化生长速率比纯Ni镀层明显降低。
A major drawback of currently used ferritic stainless steel interconnects in solid oxide fuel cells is the loss of electrical conductivity due to high-temperature oxidation of the steels and the formation of a poorly conductive chromia layer. To overcome this problem, a composite coating consisting of dispersed conductive LaCrO 3 particles in a Ni matrix has been developed, studied, and optimized. Codeposition was performed using a Watts nickel electroplating bath containing suspended LaCrO 3 particles. The optimum conditions to maximize the particle volume fraction in the coating were determined to be a current density of 40-50 mA/cm 2 , 20 g/L particle loading in the bath, pH 4, and suspension of particles in the plating bath by means of an overhead impeller. For the optimum conditions, a particle volume fraction in the coating equal to ∼ 35 vol % was achieved. Oxidation tests showed that the conductive particles are embedded in the oxide layer, and the oxidation growth rate is reduced remarkably compared with pure Ni electrodeposits.