The State Key Lab of
High Performance Ceramics and Superfine Microstructure
Shanghai Institute of Ceramics, Chinese Academy of Sciences
中国 科 学 院 上 海 硅 酸 盐 研 究 所 高 性 能 陶 瓷和 超 微 结 构 国 家 重 点 实 验 室
Metal Supported Solid Oxide Cells with Thin-film Electrolyte
German Aerospace Center (DLR), Institute of Engineering Thermodynamics, D-70569 Stuttgart
High Temperature Solid Oxide Cells (SOCs) belong to the most efficient electrochemical devices for the energy conversion and storage applications. As core components, Solid Oxide Fuel Cells (SOFCs) and Solid Oxide Electrolysis Cells (SOECs) find their applications in energy supply for household, industries, electro-mobility, and particularly important in the scenario of the renewable energy transition through the “Power to X” concept.
In comparison to conventional anode-supported and electrolyte-supported full ceramic SOCs, metal supported cells has many advantages, such as reduced manufacturing and maintenance cost, fast start-up features, excellent mechanical, thermal and redox cycle stability, and etc. Supported by European Project EVOLVE (FCH JU Grant 303429-2012/2017), we have successfully demonstrated new designs of metal supported SOCs implementing a multilayer thin-film electrolyte produced by PVD and manufactured at temperature below 1000°C. Based on this experience, we propose to translate this architecture to a variety of planar SOCs.
Within this work, novel metal-supported cells were fabricated on robust porous metal substrates. Composite made of La0.1Sr0.9TiO3-α (LST) and gadolinium doped ceria (GDC) was applied as fuel electrode material. 3 µm thick thin-film bilayer electrolyte of GDC/yttrium-stabilized zirconia (YSZ) was prepared by a combination of physical vapor deposition (PVD) and wet ceramic processing. The fuel electrode and La0.6Sr0.4Co0.2 Fe0.8O3-δ (LSCF) air electrode were both deposited by screen printing. The gas-tightness of the electrolyte was monitored by differential air leakage tests at room temperature. Half cells with low leakage rate were selected and loaded with nickel nanoparticles as catalysts into the LST-GDC backbones to improve the electrochemical performance of the fuel electrode. Cells were tested under fuel cell mode and electrolysis mode, respectively. Performance and aging characteristics during operation were analyzed by electrochemical impedance spectroscopy (EIS) and chronopotentiometry. The postmortem analysis was applied to facilitate the understanding of the degradation features and mechanisms specific to the electrolysis operation of the metal-supported cells.
Feng Han received Ph.D. from the Ruhr-University Bochum, Germany, in 2010. During 2006-2012, he worked as a scientist at the Institute of Energy and Climate Research of Research Center Jülich (FZJ) in Germany. Since end of 2012, he has been working as one of the key scientists and in charge of the R&D laboratory of the solid oxide cells for high temperature energy conversions at the Institute of Engineering Thermodynamics of German Aerospace Center (DLR). His current research focuses are materials and devices for energy conversion and storage, including thin-film coating technologies, metal supported SOFCs and SOECs, high-temperature proton conducting materials and cell components, gas-separation membranes and solid-state lithium batteries.