Development of thin-film nano-structured electrolyte layers for application in anode-supported solid oxide fuel cells

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• 作者：Tim Van Gestel ; Doris Sebold ; Wilhelm A. Meulenberg ; Hans-Peter Buchkremer
• 关键词：Electrolyte layer ; Sol coating ; Colloidal sol ; Polymeric sol ; SOFC development
• 刊名：Solid State Ionics
• 出版年：2008
• 出版时间：31 May 2008
• 年：2008
• 卷：179
• 期：11-12
• 页码：428-437
• 全文大小：6494 K

文摘

This paper reports a study on the deposition of sol particles for the preparation of thin and ultra-thin electrolyte membrane layers (thickness < 5 μm–50 nm), which cannot be produced with regular powder-based processes. For the deposition process, a range of coating liquids with varying particle sizes, covering the complete range between standard suspensions with a particle size of several 100 nm and nano-particle sols, was prepared. In the first part, it is demonstrated that a colloidal sol route can be used for membrane formation on a regular macroporous SOFC anode (NiO/zirconia), when the sol particle size is adapted to the pore structure of the anode (particle size 200 nm). SEM characterization indicated a thickness in the range 3–4 μm after calcination at 600 °C and ca. 2 μm after sintering at 1400 °C, far below the limit for conventional powder-based deposition methods. In the second part, ultra-thin zirconia and ceria membrane films are prepared by spraying sols containing nano-particles (average size 5–6 nm). The layers show a thickness of 100 nm, a very narrow particle size distribution and tight ultra-microporous structure, which allows a sintering treatment below 1000 °C, and can be used as an additional electrolyte layer for improving the leak rate of the cell or as diffusion barrier.