Rapid surface kinetics enhancement via flash light sintering for low-temperature solid oxide fuel cells
Rapid surface kinetics enhancement via flash light sintering for low-temperature solid oxide fuel cells
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DOI：
10.1016/j.jallcom.2018.11.178
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发表时间：
2019-03-25
影响因子：
6.2
通讯作者：
Kim, Young-Beom
中科院分区：
文献类型：
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作者：
Hong, Soonwook;Lim, Yonghyun;Kim, Young-Beom
“钐掺杂的二氧化铈（SDC）具有优异的电化学催化特性，是一种很有前途的固体氧化物燃料电池（SOFC）工作温度材料。尽管其具有非凡的电化学反应活性，但其在还原现象方面的化学不稳定行为使其在SOFC电解质中的应用具有挑战性。然而，就缺陷化学而言，这种不稳定性可以提高电解质表面的氧掺入率。在这里，我们报道了一种通过闪光灯烧结的SDC薄膜的快速表面处理方法，该方法显示出纳米颗粒的结晶度发展和移动掺杂物阳离子诱导的氧空位在几毫秒内增加。我们证明了闪光烧结引起的结晶度的快速发展和二氧化铈的减少增加了氧还原表面动力学，导致sofc中阴极反应的氧掺入率提高。与原始电池相比，闪光灯烧结的SOFC性能提高了两倍以上。(C) 2018 Elsevier B.V.版权所有
"Samaria-doped ceria (SDC), with exceptional electrochemical catalyzing characteristics, is a promising material for the operating temperature of solid oxide fuel cells (SOFC). Despite its extraordinary elec- trochemical reactivity, its chemical unstable behavior in terms of reduction phenomenon has made its application to SOFC electrolyte challenging. In regard to the defect chemistry, however, this instability can enhance the oxygen incorporation rate at the surface of the electrolyte. Here, we report a rapid surface treating method for SDC thin films via flash light sintering, which revealed an outstanding crystallinity development with nano-grains and increment of mobile dopant cation-induced oxygen vacancies within few milliseconds. We demonstrated that the flash light sintering-induced rapid development of crystallinity and reduction of ceria increases oxygen reducing surface kinetics, leading to an improvement in the oxygen incorporation rate of the cathodic reaction in SOFCs. The performance of SOFC sintered by flash light indicated more than two-folds enhancement comparing the pristine cell." (C) 2018 Elsevier B.V. All rights reserved.