Abstract
PBI(polybenzimidazole) based HT-PEFC(high temperature polymer electrolyte fuel cell) has been received a lot of attention as a great alternative of the LT-PEFC(low temperature polymer electrolyte fuel cell). Currently, life time of HT-PEFC was shorter than LT-PEFC, so life extension of HT-PEFC has been studied. But existing research works on the life time of HT-PEFC focus on finding out the causes of its performance degradation in the single cell or small size of sub-stack levels. Researches on the life time of HT-PEFC in a full stack level have nearly been conducted. In this paper, effective operational algorithm for HT-PEFC such as minimizing OCV conditions, selecting the proper operation temperature and purging the water inside of the HT-PEFC stack were established to avoid a performance degradation of HT-PEFC in a full stack level. 5kW HT-PEFC stack was manufactured by ourselves and conducted long-term operating test using the proposed operating algorithm. As a result, HT-PEFC stack was successfully operated with a less degradation rate during the target life time.
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