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Electrophoretic Deposition of Functionally Graded NiO/YSZ for SOFC Anode Fabrication

Zarabian, Mina | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41424 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Faghihi Sani, Mohammad Ali; Simchi, Abdolreza
  7. Abstract:
  8. The future crisis and environmental pollution led to increasing interest in alternative energy conversion systems such as solid oxide fuel cell (SOFC). One of the main obstacles in using SOFCs is their relatively high fabrication cost compared with their low amount of produced energy .Therefore, in the present study, fabrication of a more cost-efficient functionally graded NiO-YSZ composite for SOFC anode by electrophoretic deposition (EPD) method was investigated. In this research, the effect of different chemical parameters such as media, additives, particle size distribution and nano NiO addition were initially investigated on the stability of NiO-YSZ suspension by Zetasizer and turbidity meter. The results showed that a stable suspension can be made in isopropanol by adding a low amount of iodine. Furthermore, nano NiO addition reduced the suspension stability. In the next step, the effects of physical parameters of EPD such as electric field (33.3-200 V/cm) and deposition time (15-600s) on the microstructure and composition were studied by using the optimized suspension. It was observed that with increasing the deposition time, the number and the size of composite porosities decreased as a result of the change in suspension concentration and increase in voltage drop. EDS and atomic absorption spectroscopy (AAS) quantitative analysis showed that in addition with microstructural variation throughout the thickness, the composition of the composite changed as well. In this way, the large amount of Ni at the vicinity of the electrode surface decreased continuously with moving away from the electrode. Studying the effect of the electric field demonstrated that with decreasing the electric field, the microstructure became denser along with diminution in amount of large NiO particles in the microstructure. Consequently, with decreasing the electric field during the deposition time, modification of NiO-YSZ composition and microstructure throughout the thickness can result in a functionally graded composite
  9. Keywords:
  10. Solid Oxide Fuel Cell (SOFC) ; Anode ; Functionally Graded Materials (FGM) ; Nickle Oxide ; Composite Materials ; Yttria-Stabilized Zirconia (YSZ)

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