Development of Porous Electrode in Solid Oxide Fuel Cells by the Flame Spray Technique

• Main Authors: Sun,Pei-Kai, 孫培凱
• Other Authors: Yang,Yung-Chin
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/ygmjyq

碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 105 === In this study, a gradient porous anode of solid oxide fuel cell was prepared by flame spray. The temperature of flame spray is lower than plasma spray, and the thermal stress of the substrate is relatively small. Flame spraying was employed to deposit anode of solid oxide fuel cells (SOFC) to lower manufacturing cost. We used nickel oxide (NiO) and 8 mol% yttrium oxide stabilized zirconia (8YSZ) as anode powder, and the flowability of the composite powder was improved by spray granulation. Ni-coated graphite (NiGr) powder was added to regulate the porosity of the anode and the proportion of Ni-8YSZ in the coating to increase the conductivity and improve the thermal expansion coefficient of anode coating. An electron microscope (SEM) is used to analyze the coating properties such as surface morphology, cross-section, and pore distribution. The properties are evaluate by analyzing the porosity, conductivity, and coefficient of thermal expansion (CTE) of the coating. At the end of this study, the problem that the thermal expansion coefficient of the anode mismatches with the electrolyte is improved by spraying the gradient porous anode.