Abstract
A cryo CT imaging to observe fixed three-dimensional liquid water structure of PEFC was developed. An operating at 40 °C cell temperature and 80 % gas relative humidity was instantaneously frozen, and the CT imaging was performed in low humidity and low temperature gas to prevent condensation from adhering to the MEA. The results of GDL visualization showed that the liquid water in the GDL was connected between the pores and formed a large structure. Moreover, it was found that, from the calculation of effective pore diameter, liquid water mainly accumulates in pores having 7
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