RedOx study of anode-supported solid oxide fuel cell
RedOx study of anode-supported solid oxide fuel cell
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DOI：
10.1016/j.jpowsour.2008.12.118
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发表时间：
2009-08-01
影响因子：
9.2
通讯作者：
Van herle, Jan
中科院分区：
文献类型：
--
作者：
Faes, Antonin;Nakajo, Arata;Van herle, Jan
固体氧化物燃料电池（SOFC）的常用技术是基于镍的陶瓷（陶瓷-金属复合材料）阳极和氧化钇稳定氧化锆（YSZ），通常用作支撑结构。该技术的主要限制之一是阳极对还原和氧化（“RedOx”）循环的容忍度。在这项研究中，使用了两种技术来量化镍在不同温度下氧化还原循环后的阳极膨胀。第一种方法通过测量电解液层中的裂纹宽度来考虑阳极在电解液断裂极限以上的膨胀。在第二种方法中，使用扫描电子显微镜（SEM）图像定量测量阳极孔隙率。同样的测量技术用于在恒温下连续氧化还原循环后量化阳极膨胀。然后将定量技术应用于在实际堆叠条件下测试的细胞。根据堆设计和燃料利用率的不同，电池角落可以经历多次氧化还原循环。对这些区域的研究可以估计阳极在局部经历的循环次数。(C) 2008 Elsevier B.V.版权所有
The common technology for solid oxide fuel cells (SOFC) is based on a cermet (ceramic-metal composite) anode of nickel with yttria stabilized zirconia (YSZ), often used as the supporting structure. One of the main limitations of this technology is the tolerance of the anode towards reduction and oxidation ("RedOx") cycles.In this study, two techniques are used to quantify the anode expansion after a RedOx cycle of the nickel at different temperatures. The first method considers the anode expansion above the electrolyte fracture limit by measuring the crack width in the electrolyte layer. In the second method, the anode porosity is measured using scanning electron microscopy (SEM) image quantification. The same measurement techniques are used to quantify anode expansion after consecutive RedOx cycles at constant temperature.The quantification technique is then applied to cells tested in real stack conditions. The cell corners can undergo several RedOx cycles depending on stack design and fuel utilization. The study of such zones allows estimating the number of cycles that the anode experienced locally. (C) 2008 Elsevier B.V. All rights reserved.