反応性添加物を用いたSOFC空気極のガラス質不純物への耐性の向上に関する研究

使用反应性添加剂提高SOFC空气电极抗玻璃态杂质的研究

基本信息

批准号：
26820297
负责人：
BISHOP Sean
金额：
$ 2.5万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Young Scientists (B)
财政年份：
2014
资助国家：
日本
起止时间：
2014-04-01 至 2015-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-26820297/
关键词：
Solid oxide fuel cell electrode impurity durability

项目摘要

Fast oxygen exchange kinetics, a key figure of merit in solid oxide fuel cell (SOFC) electrodes, is often dramatically hindered by the presence of even small concentrations of impurities. Si, for example, is common in ceramics processing. It was found that rapid degradation of oxygen exchange kinetics occurred on dense thin films of Pr0.1Ce0.9O2-d (PCO), a mixed ionic electronic conducting electrode for SOFCs. A new optical transmission relaxation (OTR) technique was developed to aid in measuring kinetics on the bare film surfaces. A key advantage of this technique is that it does not require current collectors typical of conventional measurements. Si was identified by TEM and XPS as a significant surface impurity, which forms a blocking layer on the electrode surface. Deposition of a La oxide film was found to result in full recovery of oxygen exchange kinetics on the measured sample. La and Si oxides were found to interact with each other as identified by a shift in the O1s XPS peak and a systematic OTR study of films that likely react with Si (e.g. La, Sm oxides) and those that do not (e.g. Nb, Ti, Zn oxides). These results indicate that La may "clean" the surface of the SOFC electrode, thereby dramatically improving oxygen transport kinetics. Preliminary measurements of OTR on a La-PCO solid solution indicates improved long-term electrode kinetics stability, demonstrating the commercial potential of this method to achieve Si impurity tolerance.

快速氧交换动力学是固体氧化物燃料电池（SOFC）电极中的关键功能，通常会受到甚至少量杂质的浓度而极大地阻碍。例如，SI在陶瓷处理中很常见。发现氧交换动力学的快速降解发生在PR0.1CE0.9O2-D（PCO）的密集薄膜上，这是SOFC的混合离子电子导电电极。开发了一种新的光学传输松弛（OTR）技术，以帮助测量裸膜表面上的动力学。该技术的一个关键优势是，它不需要典型的常规测量值当前收集器。 Si通过TEM和XPS鉴定为显着的表面杂质，该杂质在电极表面形成阻滞层。发现LA氧化物膜的沉积可在测得的样品上完全恢复氧气交换动力学。发现LA和SI氧化物通过O1S XPS峰的变化以及对可能与Si反应的膜的系统研究（例如LA，SM氧化物）和不具有的膜进行系统的OTR研究所确定的（例如NB，NB，Ti，Zn氧化物）。这些结果表明LA可以“清洁” SOFC电极的表面，从而显着改善氧气传输动力学。 OTR在LA-PCO固体溶液上的初步测量表明长期电极动力学稳定性提高，证明了该方法实现SI杂质耐受性的商业潜力。