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�p���v��Ahead of the world, the demonstrative research on the field of SOFCs has started since 2007 in Japan, and the researches and the developments of practical SOFC systems have been progressed energetically for commercialization. Improvement and verification of the durability of the SOFC cell/stack is one of the most important issues in these research for commercialization. As far as SOFC is concerned, not only the operating conditions such as fuel flow rate, its composition, air flow rate, fuel utilization, air utilization and operating temperature, but also the geometry and the material of peripherals affect the performance of SOFC significantly. Therefore, following points are considered to be the critical issues in the durability evaluation. 1) Controlling a number of control items with good precision during long durability testing time. 2) Improvement of measuring precision for evaluating degradation rate less than 0.25% /1000 hours. In addition, although the durability is often prescribed by the voltage change of the cell stack under constant current condition, using this method, the degradation rate at the high current density condition tends to become larger than that of the low current density condition in appearance. Moreover, in each durability test, details of definition of degradation, the measuring methods and conditions are generally different among the SOFC cell/stack developers and system developers and this inconsistency, in turn, makes the correct evaluation of durability and the assurance of cell/stack performance extremely difficult. For these problems, European countries have shown activity for establishing international standardization for SOFC durability test methods while Asian countries such as China, south Korea, Singapore etc., are progressing their SOFC processing technique for developing low cost SOFCs. Under these circumstances, international standardization of the SOFC cell/stack durability test methods which reflects Japanese technology is requisite to maintain Japanese superiority in the SOFC development and to accelerate system development and commercialization while planning the development of production footholds to the foreign countries if necessary. Therefore, in this feasibility study, examples of durability test methods which are carried out especially in Europe are investigated. They were then compared with the performance evaluation methods AIST has ever been researching. At the same time, physico-chemically desirable index for the evaluation of durability was discussed and summarized. As a result of the investigation, technical problems in a durability test method are compiled. Furthermore, the committee which is consisted with a developer of the SOFC cell stack, a user and personnel expert in international standardization of various test methods was organized and the problems and the R & D plan for international standardization of a durability test method for SOFC cell/stack were discussed.
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