“…Jason et al set a simple along-the-channel model and experimentally verified the evolution of liquid water and nitrogen fronts along the length of the anode channel in a fuel cell, but it's only for little format fuel cell with single sampling port [3]. Fang et al designed a large electrochemical surface area single cell with multiple gas sample ports both in cathode and anode, which provides a reference for the study of large format fuel cell [4]. The method of sampling for the internal gas concentration of different positions in large format fuel cell is not so mature, which is rarely documented in the literature.…”