area of the porous electrode by increasing the degree of integration As

Area of the porous electrode by increasing the degree

This preview shows page 4 - 6 out of 11 pages.

area of the porous electrode by increasing the degree of integration. As researches for similar microtube SOFC, there have been studies on rapid startup using the YSZ electrolyte supported SOFC at 2~5 mm level with high thermomechanical strength [8][9] . However, there were very few developments for the manufacturing technology for high performance such as achievements at low temperature range of 650 °C or less or the development of small integrated modules. Our challenge was to manufacture high-performance SOFC and integrated modules unseen before, and therefore, we investigated the manufacturing technology of the integrated modules composed of anode supported micro SOFC. Moreover, although there were only a small number of studies since the mechanical strength was low and forming was difficult, we developed the manufacturing process using ceria electrolytes with high oxide ion conductivity at low temperature. As the technologies for manufacturing and design of the microtube SOFC and integrated module with fuel gas pores Fig. 4 Structure of various fuel cells Fig. 5 Design model and the results of current collection loss calculation for the integration of the micro-tubular SOFC design technology
Image of page 4
Research paper : Challenge for the development of micro SOFC manufacturing technology (Y. F ujishiro et al. ) − 49 − Synthesiology - English edition Vol.4 No.1 (2011) of 2 mm or less, the optimization of the cell form (thickness of electrolyte and electrode, optimal cell length, etc.) that affected the final module generation capacity was important. In the anode supported cell, because the electrode has the roles of reactive field in the three-phase boundary for the electrochemical reaction and of the collector of current generated in the reaction, its design greatly affected the generation performance of the cell and integrated module. Figure 5 shows the results of the different power collection methods and the cell form for achieving high performance in the Anode supported microtube SOFC and its integrated module. The results were used to design the length of the cell collector. The collection resistance increased when the long cell design was used to extend the electrode surface area of the single cell structure, and the power generation output decreased (current collection loss). The design technology needed to manufacture the microtube SOFC with exterior diameter 2 mm (interior diameter 1.6 mm , electrode film thickness of 0.2 mm) is explained. Assuming the generation performance to be 0.5 W/cm 2 at 550 °C, the current collection loss in the equivalent circuit was calculated using the single-end and double-end current collection models. The relationship of the current collection loss arising from the current collection resistance factor and cell length is shown in Fig. 5. When the length whereby the current collection loss in power generation would be 3 % or less was calculated, it was found that the integrated module must be designed with cell length of 2.0 cm for double- end current collection and 1.0 cm for single-end current
Image of page 5
Image of page 6

You've reached the end of your free preview.

Want to read all 11 pages?

  • Fall '16

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes