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Research paper : Challenge for the development of micro SOFC manufacturing technology (Y. Fujishiro et al.)−55−Synthesiology - English edition Vol.4 No.1 (2011) capacity and the solution by low temperature operation and speeding up the startup/shut-down.The target is set for generation module, and we assumed the kW class module that is highly in demand as civilian power source. As the module capacity increases, the module volume increases and the exchange of heat rises. The technology to manufacture a module that can withstand low temperature and rapid startup/shutdown using the micro module SOFC will be effective from the aspect of solving the heat control issues.We added the description of the target for developed output capacity and the thoughts on solutions by low temperature operation and startup/shut-down control.(2) We reconsidered and modified the paper in response to your indication that the flow from microtube to honeycomb SOFC is unclear, and that there is a need for future issues.3 Current situation, issues, and strategy for solution of the micro SOFC technology Comment (Toshimi Shimizu)I understand that there is importance in the development of compact, high-output, low-temperature fuel cells to meet the demands of industry and society from the descriptions in the first half of the paper. However, the main part or the development trend, comparison of performances, problems, and other things about the micro SOFC technology are not described. However, in the latter half of the paper, you abruptly bring out the comparison chart of performances, and conclude that you realized an original micro SOFC never seen before. The readers want to know the details of the table, and the strategy of this research and the synthesiology. I think the table should be utilized more effectively in the first part.Answer (Yoshinobu Fujishiro)As you indicate, we understood that the descriptions of development trends, comparison of performances, and problems of the micro SOFC technology are insufficient in the text, and also that the discussion of the research strategy for the solution is weak. On the other hand, the micro SOFC technology and its module development have not progressed very far in Japan and abroad among the various SOFC fields. It is not a generally major technological field, and the research is carried out with the advantage of AIST, and we think it is a field for which the technological development should be pushed by defining the issues. We wish to emphasize that, along the technological strategy road map, one of the solutions for the compact, high-output, low-temperature fuel cells is the realization of the micro SOFC module technology, and I hope the readers understand this. There is no technological index for micro SOFC, but we presented the comparison table to clarify the positioning of our technology and to show the world benchmark. For the above reason, we shall reconsider if it is necessary to review the synthesis. We added some description of the technological issues and explanation to emphasize that the technological issues for SOFC is the realization of low-cost, readily usable, high-output, and low-temperature fuel cells, and this is a strategy for the CO2 reduction technology.Comment (Hiroshi Tateishi)This point is related to Discussion 2. In Table 2, there is no explanation of the technological indices shown here and I am unable to see how the technology shows “high performance”. Also, it is unclear whether the results shown in the table are the results of the microtube or those of the honeycomb integration.Answer (Yoshinobu Fujishiro)The technological indices are values achieved in microtube SOFC and honeycomb SOFC for the cell form, material, and operating temperature. For the generation density, since the anode thickness is thinner in honeycomb than in microtube SOFC, the maximum value is the value for microtube SOFC. We added the output density for honeycomb SOFC and included an explanation. The rapid startup (217 °C/min) in 3 min was demonstration data for honeycomb SOFC, and this will be stated in the note. Even with the microtube SOFC, startup can occur in a few minutes for a single cell, it is about 10 min (65 °C/min) at 200 W level by burner startup in the module.

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