A Ce(Mn,Fe)O2 dense nanofilm as an improved active anode for metal-supported solid oxide fuel cells
A Ce(Mn,Fe)O2 dense nanofilm as an improved active anode for metal-supported solid oxide fuel cells
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DOI：
10.1039/c3ra40257f
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发表时间：
2013-06
期刊：
影响因子：
3.9
通讯作者：
Young-Wan Ju;S. Ida;T. Ishihara
中科院分区：
文献类型：
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作者：
Young-Wan Ju;S. Ida;T. Ishihara
研究了掺杂CeO2的离子-电子混合导体作为致密阳极的应用。通过锰和铁的双掺杂显著提高了CeO2的电子和氧化物混合离子电导率。虽然锰的固溶度极限约为20%，但当锰与10摩尔%的铁共掺杂时，在30摩尔%的锰中没有观察到杂质相，这表明Fe的加入扩大了锰的固溶度极限。掺杂Fe和Mn的纳米CeO2(CMF)薄膜虽然密度较高，但对阳极反应具有很高的活性。此外，CMF薄膜有效地阻止了Ni向LaGaO_3电解液薄膜中的扩散，因此CMF薄膜对LaGaO_3钙钛矿电解液薄膜的固体氧化物燃料电池具有双功能特性。此外，在Ni-Fe衬底和LSGM(La0.9Sr0.1Ga0.8Mg0.2O3)电解液之间插入CMF致密膜可显著提高电池的功率密度，特别是在中温下。电池的最大功率密度在973K时约为3.0W cm−2，在673K时约为0.2W cm−2。与多孔阳极相比，由于氧离子导电性和电荷转移步骤的改善，纳米薄膜的过电位显著降低。因此，所述纳米级CMF致密膜可以作为一种独特的活性阳极材料。
The application of a mixed ionic and electronic conductor, doped CeO2, as a dense anode was investigated in this study. The mixed electronic and oxide ionic conductivity in CeO2 was significantly improved through the double doping of Mn and Fe. Although the solid solubility limit of Mn was approximately 20 mol%, no impurity phase was observed at 30 mol% Mn when Mn was co-doped with 10 mol% Fe; this result suggests that the solubility limit of Mn was expanded through the addition of Fe. The nano-sized Fe- and Mn-doped CeO2 (CMF) film was highly active toward the anode reaction despite its high density. In addition, the CMF thin film was effective in preventing Ni diffusion into the LaGaO3 electrolyte film; CMF therefore exhibits bi-functional properties for solid oxide fuel cells with LaGaO3 perovskite electrolyte films. Furthermore, the insertion of a CMF dense film between the Ni–Fe substrate and the LSGM (La0.9Sr0.1Ga0.8Mg0.2O3) electrolyte resulted in a significant increase in the power density of the cell, particularly at intermediate temperatures. The maximum power density was ca. 3.0 W cm−2 at 973 K and ca. 0.2 W cm−2 at 673 K. The high power density of the cell was explained by the enhanced anodic activity. Compared with porous anodes, the nano-sized film showed a significantly lower overpotential because of the improved oxygen ion conductivity and charge-transfer steps. Therefore, the nano-sized CMF dense film described here can serve as a unique active anode material.