Porous nickel-iron alloys as anode support for intermediate temperature solid oxide fuel cells: II. Cell performance and stability
Porous nickel-iron alloys as anode support for intermediate temperature solid oxide fuel cells: II. Cell performance and stability
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多孔镍铁合金作为中温固体氧化物燃料电池的阳极支撑体：II．
DOI：
10.1016/j.ijhydene.2018.09.142
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发表时间：
2018
影响因子：
7.2
通讯作者：
Jian Li
中科院分区：
文献类型：
--
作者：
Wang Xin;Jia Lichao;Li Kai;Yan Dong;Chi Bo;Pu Jian;Jian Li
多孔镍铁合金支撑固体氧化物燃料电池（SOFC）是通过低成本的陶瓷工艺，包括流延成型，丝网印刷和共烧结。以加湿氢气为燃料，流动空气为氧化剂，对电池性能进行了表征。从结构稳定性的角度研究了铁含量对电池性能和氧化还原及热循环稳定性的影响。由镍和镍铁合金（50wt%铁）支撑的单电池表现出相对较高的放电性能，在800 °C下测得的最大功率密度分别为1.52和1.30 W cm-2。镍负载的SOFC由于其在热循环下尺寸稳定的基底而在200 ° C至750 °C之间显示出更好的热稳定性。实验后分析表明，在氧化初期，镍铁合金表面形成了致密的氧化铁层，阻止了基体和功能阳极层的进一步氧化，使镍铁基SOFC在750 °C下具有较好的氧化还原稳定性。在镍铁合金（50wt%铁）中加入0.5wt%的氧化镁可以抑制金属烧结，降低线收缩，使单电池表现出良好的热稳定性。
Porous nickel–iron alloy supported solid oxide fuel cells (SOFCs) are fabricated through cost-effective ceramic process including tape casting, screen printing and co-sintering. The cell performance is characterized with humidified hydrogen as the fuel and flowing air as the oxidant. Effects of iron content on the cell performance and stability under redox and thermal cycle are investigated from the point of view of structural stability. Single cells supported by nickel and nickel–iron alloy (50 wt % iron) present relatively high discharge performance, and the maximum power density measured at 800 °C is 1.52 and 1.30 W cm−2respectively. Nickel supported SOFC shows better thermal stability between 200 and 750 °C due to its dimensional stable substrate under thermal cycles. Posttest analysis shows that a dense iron oxide layer formed on the surface of the nickel-iron alloy during the early stage of oxidation, which prevents the further oxidation of the substrate as well as the functional anode layer, and thus, making nickel-iron supported SOFC exhibits better redox stability at 750 °C. Adding 0.5 wt % magnesium oxide into the nickel-iron alloy (50 wt% iron) can inhibit the metal sintering and reduce the linear shrinkage, making the single cell exhibit promising thermal stability.