Study on synthetic BaCe0.6Zr0.2Y0.2O3-δ and La0.6Sr0.4Co0.2Fe0.8O3-δ nanofibers as composite cathode for proton-conducting solid oxide fuel cell

• Main Authors: Huynh Thi Bich Ngoc, 黃氏碧玉
• Other Authors: Sheng-Wei Lee
• Format: Others
• Language: en_US
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/9yt53h

碩士 === 國立中央大學 === 應用材料科學國際研究生碩士學位學程 === 107 === In this study, mixing ionic electronic conductor electrode scaffolds form by a number of one-dimensional nanofibers are intensively investigated, obtained through electrospinning technique. The La0.6Sr0.4Co0.2Fe0.8O3-δ oxide nanofibers was synthesized by electrospinning technique for proton conducting solid oxide fuel cell. Optimization of the flow rate and applied voltage parameters for electrospinning process. The results exhibit that a solution flow rate of 0.5 mL/h, an applied voltage of 12 kV, and the distance between the needle and collector of 12cm allow to obtain tissues with an average nanofiber diameter of 479 nm. BaCe0.6Zr0.2Y0.2O3-δ oxide nanofibers were also produced in the same condition. The obtained BCZY fibers with well-developed perovskite structures were 225 nm in diameter. Morphologies and microstructure of La0.6Sr0.4Co0.2Fe0.8O3-δ and BaCe0.6Zr0.2Y0.2O3-δ nanofiber were studied in this thesis. After electrospinning process, the La0.6Sr0.4Co0.2Fe0.8O3-δ and BaCe0.6Zr0.2Y0.2O3-δ nanofibers were calcined. The subsequent calcination processes are investigated through scanning electron microstructure (SEM) and scanning transmission electron microscopy (STEM), which shows morphologies and microstructures. The crystal structure of La0.6Sr0.4Co0.2Fe0.8O3-δ and BaCe0.6Zr0.2Y0.2O3-δ nanofibers was examined by X-ray diffraction that can be indexed as a pure perovskite-type phase of both LSCF and BCZY. The morphological chacteristics of the LSCF and BCZY calcined tissues are very promising for application in intermediate temperature solid oxide fuel cell (IT-SOFC) as copmposite cathode.