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Research paper−251−Synthesiology - English edition Vol.5 No.4 pp.251-261 (Mar. 2013) conditions. For this reason the test conditions were very specifically described, and the flat-plate type was the only type of SOFC single cell/stack covered extensively, since it was the focus of development in Europe. In Japan, while there were ongoing SOFC-related research and development projects conducted by the New Energy and Industrial Technology Development Organization (NEDO) and other organizations, the efforts to standardize testing methods were lagging behind those of Europe.In addition, research and development on SOFCs in Japan took a wide variety of approaches. The goal was to ensure reliability in all applications by securing mechanical strength and reducing the rate of degradation under many different service conditions conceivable at high temperature, the operating environment associated with SOFC. This has led to the development of many types of SOFCs differing in geometry and cell size. Since different operating conditions are appropriate for different types of SOFC, establishing test conditions by simply integrating these different operating conditions would disregard the fact that each SOFC was designed with a certain type of service condition in mind. Comparisons of SOFCs based on such test conditions are not appropriate and defeat the purpose of making such comparisons in the first place. Given such circumstances, it was necessary that Japan take a leading role in the development of international standards on 1 IntroductionSince the 1970s, Solid Oxide Fuel Cell (SOFC) has been a major focus of research and development in Japan. As a result of government-funded and other projects, the technology is now fast approaching commercialization. A number of manufacturers outside Japan are believed to already have the capability to provide a continuous supply of SOFC systems ranging from 1 kW to a few hundred kW. In Japan, 700 W-class SOFCs were introduced on the market last year as the core technology of the ENE-FARM system. While SOFC systems are thus already available for practical and commercial purposes from some manufacturers, the technology has not yet attained the level where cell/stack (i.e. single cells in a stack) products backed by sufficiently reliable data are widely traded. These products are still in the development stage, with issues relating to long-term durability and manufacturing cost unresolved in many cases. In order to address these issues, Europe took initiatives to harmonize and standardize testing conditions through such projects as the Fuel Cell TEsting and STandardisation NETwork (FCTESTNET) and its successor, the Fuel Cell Systems TEsting, Safety and Quality Assurance (FCTESQA),[1] thereby accelerating the research and development efforts. The main aim of the standardization work was to facilitate cross-border comparisons of the results of round robin tests by harmonizing the test procedures and - Standardizing test methods and ensuring reliability of test results for the commercialization of SOFC-SOFC (solid oxide fuel cell) is a very promising technology that achieves high power generation efficiency, while being very nearly usable. It is high time we considered enhancing commercialization and dissemination of SOFC by setting a standard for the evaluation method of SOFC cell/stack performance. In setting the standard, it is neither appropriate to describe the specific content or form of the test object, nor appropriate to unify the test conditions, because each type of SOFC has been developed for a different application owing to the diversity of SOFC. On the other hand, uncertainty evaluation of the test results has been introduced to ensure reliability. In setting a standard for the SOFC performance test, it is necessary that the method for uncertainty evaluation be specifically described in the text, because the performance of SOFC depends on many parameters. This report describes the approaches we have taken in order to set the international standard of the SOFC test method and to evaluate the uncertainty of the test results.Evaluating uncertainty for the standardization of single cell/stack power generation performance tests for SOFC Keywords : Solid oxide fuel cell, SOFC, uncertainty, performance evaluation, standardization[Translation from Synthesiology, Vol.5, No.4, p.243-252 (2012)]Akihiko Momma*, Kiyonami Takano, Yohei Tanaka and Tohru KatoEnergy Technology Research Institute, AIST Tsukuba Central 2, 1-1-1 Umezono, Tsukuba 305-8568, Japan*E-mail: Original manuscript received April 3, 2012, Revisions received May 2, 2012, Accepted May 11, 2012

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