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arXiv 1701.05928cond-mat.mtrl-sci
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固体氧化物燃料电池用纳米结构La0 .8Sr0.2MnO3阴极的氧还原机理

Oxygen reduction mechanisms in nanostructured La0.8Sr0.2MnO3 cathodes for Solid Oxide Fuel Cells

Joaquín Sacanell, Joaquín Hernández Sánchez, Adrián Ezequiel Rubio López, Hernán Martinelli, Jimena Siepe, Ana G. Leyva, Valeria Ferrari, Dilson Juan, Miguel Pr… 展开作者

Joaquín Sacanell, Joaquín Hernández Sánchez, Adrián Ezequiel Rubio López, Hernán Martinelli, Jimena Siepe, Ana G. Leyva, Valeria Ferrari, Dilson Juan, Miguel Pruneda, Augusto Mejía Gómez, Diego G. Lamas

摘要:

在这项工作中,我们概述的机制,有助于在纳米结构的La0.8Sr0.2MnO3(LSM)的固体氧化物燃料电池(SOFC)阴极的氧还原反应。这些阴极,从LSM纳米结构管开发,可以在较低的温度下使用相比,微结构的,这是一个至关重要的事实,以避免燃料电池组件的退化。操作温度的这种降低主要源于两个因素:i)通过阴极材料的显著氧化物离子扩散的出现,其中纳米结构起关键作用,以及ii)通过阴极的多孔结构的氧气的优化气相扩散,其变得可忽略。通过第一性原理计算支持的电化学阻抗谱的详细分析指出,通过氧化物离子通过阴极表面的快速传输,提高了整体阴极性能。

英文摘要:

In this work we outline the mechanisms contributing to the oxygen reduction reaction in nanostructured cathodes of La0.8Sr0.2MnO3 (LSM) for Solid Oxide Fuel Cells (SOFC). These cathodes, developed from LSM nanostructured tubes, can be used at lower temperatures compared to microstructured ones, and this is a crucial fact to avoid the degradation of the fuel cell components. This reduction of the operating temperatures stems mainly from two factors: i) the appearance of significant oxide ion diffusion through the cathode material in which the nanostructure plays a key role and ii) an optimized gas phase diffusion of oxygen through the porous structure of the cathode, which becomes negligible. A detailed analysis of our Electrochemical Impedance Spectroscopy supported by first principles calculations point towards an improved overall cathodic performance driven by a fast transport of oxide ions through the cathode surface.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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