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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Positive effects of calcium-doping on the cathode performance of layered perovskite Eu1-xCaxBaCo2O5+delta for intermediate-temperature solid oxide fuel cells
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Positive effects of calcium-doping on the cathode performance of layered perovskite Eu1-xCaxBaCo2O5+delta for intermediate-temperature solid oxide fuel cells

机译：钙掺杂对层状钙钛矿Eu1-XcaxBaco2O5 +δ中间温固氧化物燃料电池阴极性能的正效作用

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摘要

A stable cathode with high catalytic activity toward oxygen reduction reaction (ORR) plays a key role in the commercialization of solid oxide fuel cells (SOFCs). Herein a series of layered perovskite oxides, Eu1-xCaxBaCo2O5+delta (x = 0-0.2), are synthesized and systematically evaluated as potential cathode materials for intermediate-temperature SOFCs (IT-SOFCs). The positive effects of calcium-doping on the cathode performance are confirmed by means of electrical conductivity, dilatometric and electrochemical measurements. The Ca-doping not only effectively optimizes the thermal expansion behavior but also significantly enhances the electrical conductivity. Among all of compositions, the Eu0.8Ca0.2BaCo2O5+delta sample exhibits the best catalytic ORR activity, as evidenced by a low area-specific resistance of 0.028 Omega cm(2) at 700 degrees C. A single cell with the Eu0.8Ca0.2BaCo2O5+delta cathode delivers a maximum power density of 1210 mW cm(-2) at 700 degrees C, and can be steadily operated over a period of 100 hat a constant voltage of 0.5 V. These results demonstrate their promising application as cathode candidates for IT-SOFCs. (C) 2019 Elsevier B.V. All rights reserved.
机译：具有高催化活性的稳定阴极对氧还原反应（ORR）在固体氧化物燃料电池（SOFC）的商业化中起着关键作用。在此，合成并系统地评估为中间温度SOFC（IT-SOFC）的潜在阴极材料（IT-SOFC）的潜在阴极材料，得到一系列层状的钙钛矿氧化物。通过电导率，膨胀和电化学测量来确认钙掺杂对阴极性能的正效应。 CA-掺杂不仅有效地优化了热膨胀行为，而且显着提高了电导率。在所有组合物中，Eu0.8Ca0.2Baco2O5 + Delta样品表现出最佳的催化型锻造活性，如700℃的低面积凝面抗性电阻在700℃下的低区域特异性电阻所证明。用EU0.8CA0的单细胞。 .2Baco2O5 + Delta阴极在700摄氏度下提供1210 mw cm（-2）的最大功率密度，并且可以在100帽的周期内稳定地操作0.5 V的恒定电压。这些结果证明了它们作为阴极候选的有前途的应用适用于IT-SOFC。 （c）2019 Elsevier B.v.保留所有权利。

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