Development of Bi-layer Metal Substrate Architectures for Suspension Plasma Sprayed Solid Oxide Fuel Cells

作者：Arevalo Quintero O; Kesler O^*

来源：Fuel Cells, 2018, 18(4): 466-475.

DOI：10.1002/fuce.201700187

• Bi-layer Metal Support
• Metal Oxidation Resistance
• Solid Oxide Fuel Cells
• Surface Imperfection Open Circuit Voltage
• Suspension Plasma Spraying

Metal-supported solid oxide fuel cells have several advantages, which could potentially increase the overall competitiveness of the technology, compared to their cermet-supported counterparts. However, surface imperfections and rapid oxidation of the metal supports at operating temperatures are factors that affect the electrochemical performance and durability of the cells. In this study, we have developed bi-layer metal supports consisting of a thin, finely structured top layer and a thicker, more coarsely structured bottom layer. The fine top layer has small surface pore sizes which facilitate the deposition of defect-free electrolyte layers, while the coarse layer provides greater open porosity and larger pore sizes to facilitate mass transport and to decrease the rate of oxidation. An open circuit voltage (OCV) as high as 1.105V at 750 degrees C in 3% humidified hydrogen is reported in this study, which deviates from the Nernst potential by only 5 mV. This result shows that the bi-layer support has the potential to minimize electrode and electrolyte defects, which are known to be detrimental to cell performance. In addition, the bi-layer supports show better oxidation resistance compared to benchmark finely-structured single-layer supports fabricated in this study for comparison.

• 出版日期2018-8