Kusnezoff Mihails, Trofimenko Nikolai, Müller Martin, Michaelis Alexander
Fraunhofer Institute for Ceramic Technologies and Systems (IKTS), Winterbergstr. 28, Dresden 01277, Germany.
Materials (Basel). 2016 Nov 8;9(11):906. doi: 10.3390/ma9110906.
The solid oxide cell is a basis for highly efficient and reversible electrochemical energy conversion. A single cell based on a planar electrolyte substrate as support (ESC) is often utilized for SOFC/SOEC stack manufacturing and fulfills necessary requirements for application in small, medium and large scale fuel cell and electrolysis systems. Thickness of the electrolyte substrate, and its ionic conductivity limits the power density of the ESC. To improve the performance of this cell type in SOFC/SOEC mode, alternative fuel electrodes, on the basis of Ni/CGO as well as electrolytes with reduced thickness, have been applied. Furthermore, different interlayers on the air side have been tested to avoid the electrode delamination and to reduce the cell degradation in electrolysis mode. Finally, the influence of the contacting layer on cell performance, especially for cells with an ultrathin electrolyte and thin electrode layers, has been investigated. It has been found that Ni/CGO outperform traditional Ni/8YSZ electrodes and the introduction of a ScSZ interlayer substantially reduces the degradation rate of ESC in electrolysis mode. Furthermore, it was demonstrated that, for thin electrodes, the application of contacting layers with good conductivity and adhesion to current collectors improves performance significantly.
固体氧化物电池是高效可逆电化学能量转换的基础。基于平面电解质基板作为支撑体（ESC）的单电池常用于固体氧化物燃料电池/固体氧化物电解池（SOFC/SOEC）堆栈制造，并且满足在小型、中型和大型燃料电池及电解系统中应用的必要要求。电解质基板的厚度及其离子电导率限制了ESC的功率密度。为了提高这种电池类型在SOFC/SOEC模式下的性能，已应用了基于Ni/CGO的替代燃料电极以及厚度减小的电解质。此外，已对空气侧的不同中间层进行了测试，以避免电极分层并减少电解模式下的电池退化。最后，研究了接触层对电池性能的影响，特别是对于具有超薄电解质和薄电极层的电池。已发现Ni/CGO的性能优于传统的Ni/8YSZ电极，并且引入ScSZ中间层可大幅降低ESC在电解模式下的退化速率。此外，已证明，对于薄电极，应用具有良好导电性和与集流体附着力的接触层可显著提高性能。
