Evaluation of electroplated Co-Cu metallic coatings for intermediate-temperature solid oxide fuel cells
Evaluation of electroplated Co-Cu metallic coatings for intermediate-temperature solid oxide fuel cells
复制标题
中温固体氧化物燃料电池电镀钴铜金属涂层的评价
DOI：
10.1016/j.ijhydene.2018.10.103
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发表时间：
2018
影响因子：
7.2
通讯作者：
C L Zeng
中科院分区：
文献类型：
--
作者：
X Zhang;H L Zhang;X G Yang;C L Zeng
采用柠檬酸盐电镀法在430铁素体不锈钢上共沉积Co-Cu合金。在氧化初期，涂层钢表面形成了三层氧化膜，由薄的CuO外层、厚的（Cu，Fe，Cr）掺杂的Co 3 O 4中间层和（Cu，Fe）掺杂的（Co，Cr）3 O 4内层组成。随着氧化时间的延长，（Co，Cr）3 O 4内层已转变为富Cr氧化物内层。Fe的扩散明显，在Co 3 O 4基尖晶石和氧化铬之间形成了（Cu，Cr，Mn）掺杂的（Co，Fe）3 O 4相互作用区。Co-Cu涂层有效地阻止了Cr从基体向外迁移。在800 °C空气中氧化500 h后，涂层样品的La 0·8 Sr 0·2 MnO 3（LSM）偶联板中没有发现Cr元素。具有CuO/Co基尖晶石结构的高导电涂层显著降低了富Cr氧化物膜的生长，从而降低了膜的面积比电阻（ASR）。讨论了涂层基体的电性能和氧化机理。
Co-Cu alloys have been co-deposited onto 430 ferritic stainless steels via electroplating with a citrate solution. At the initial oxidation stage, a three-layer scale composed of a thin CuO outer layer, a thick (Cu,Fe,Cr)-doped Co3O4middle layer and a (Cu,Fe)-doped (Co,Cr)3O4inner layer was formed on the coated steel. With extended oxidation, the (Co,Cr)3O4inner layer has been transformed into a Cr-rich oxide inner layer. An obvious outward diffusion of Fe appeared, leading to the formation of an (Cu,Cr,Mn)-doped (Co,Fe)3O4interaction zone between the Co3O4-based spinel and the chromia oxides. The Co-Cu coating effectively blocked the outward migration of Cr from the substrate. No Cr element could be found in the coupled La0·8Sr0·2MnO3(LSM) plate of the coated sample after oxidized at 800 °C in air for 500 h. The highly conductive coating with a structure of CuO/Co-based spinels significantly decreased the growth of the Cr-rich oxide scale, and thus a much lower scale area specific resistance (ASR). The electrical properties and the oxidation mechanism of the coated substrates were discussed.