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首页> 外文期刊>Advanced energy materials >Boosting the Activity of BaCo_(0.4)Fe_(0.4)Zr_(0.1)Y_(0.1)O_(3−δ) Perovskite for Oxygen Reduction Reactions at Low-to-Intermediate Temperatures through Tuning B-Site Cation Deficiency
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Boosting the Activity of BaCo_(0.4)Fe_(0.4)Zr_(0.1)Y_(0.1)O_(3−δ) Perovskite for Oxygen Reduction Reactions at Low-to-Intermediate Temperatures through Tuning B-Site Cation Deficiency

机译：通过调节B-位阳离子亏缺提高中低温度下BaCo_（0.4）Fe_（0.4）Zr_（0.1）Y_（0.1）O_（3-δ）钙钛矿的氧还原反应活性

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摘要

Doped perovskite oxides with the general formula of A(x)A ' 1-xByB ' O-1-(y)3 have been extensively exploited as the cathode materials of solid oxide fuel cells (SOFCs), but the performance at low-to-medium temperatures still needs improvement. BaCo0.4Fe0.4Zr0.1Y0.1O3-delta (BCFZY) has been recently reported to show promising oxygen reduction reaction (ORR) activity under SOFCs' operating conditions. Here, it is reported that the activity of BCFZY can be further boosted via introducing a slight B-site cation deficiency into the oxide lattice, and such an improvement is assigned to an increase in oxygen mobility that brings enhancement in both surface exchange and bulk diffusion kinetics. Specifically, materials with the nominal composition of Ba(Co0.4Fe0.4Zr0.1Y0.1)(0.975)O-3-(delta) and Ba(Co0.4Fe0.4Zr0.1Y0.1)(0.95)O-3-(delta) show significantly improved activity for ORR at reduced temperatures with the area specific resistances of 0.011 and 0.024 omega cm(2) at 600 degrees C, as a comparison of 0.042 omega cm(2) for the cation stoichiometric BCFZY. Excessive B-site deficiencies, however, lead to the formation of impurity phases, which cause a block for charge transfer and, consequently, a reduction in electrode performance. Introducing a B-site cation deficiency is a promising way to optimize the activity of perovskite oxides for ORR at reduced temperatures, but the degree of deficiency shall be carefully tuned.
机译：通式为A（x）A'1-xByB'O-1-（y）3的掺杂钙钛矿氧化物已被广泛用作固体氧化物燃料电池（SOFC）的阴极材料，但其性能低至-中等温度仍需要改进。据报道，BaCo0.4Fe0.4Zr0.1Y0.1O3-δ（BCFZY）在SOFC的工作条件下显示出令人鼓舞的氧还原反应（ORR）活性。在此，据报道，通过向氧化物晶格中引入少量的B位阳离子缺乏，可以进一步提高BCFZY的活性，并且这种改进被认为是提高了氧迁移率，从而提高了表面交换和整体扩散的能力。动力学。具体而言，标称成分为Ba（Co0.4Fe0.4Zr0.1Y0.1）（0.975）O-3-δ和Ba（Co0.4Fe0.4Zr0.1Y0.1）（0.95）O-3-的材料相对于阳离子化学计量的BCFZY为0.042Ωcm（2），δ在600摄氏度时在降低的温度下具有显着改善的ORR活性，面积比电阻为0.011和0.024Ωcm（2）。然而，过多的B位缺陷会导致杂质相的形成，从而导致电荷转移受阻，从而导致电极性能下降。引入B位阳离子缺陷是在降低的温度下优化钙钛矿氧化物对ORR的活性的有前途的方法，但是必须谨慎调整缺陷的程度。

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