Abstract：The performance of proton exchange membrane fuel cell (PEMFC) is closely related to the mass transfer performance. A new type of three-dimensional blockage was designed in the cathode flow channel to produce throttling effect on air. The effects of straight channel and different throttling channels on mass transfer performance of PEMFC were investigated. The variation rules of water and gas distribution, net power and effective mass transfer coefficient of the battery with different flow channels of the throttling unit were analyzed. The results show that the throttling channel can effectively improve the battery performance, optimize the distribution of water and gas, and increase the maximum net power and the effective mass transfer coefficient. Compared with the straight channel, the current density of the downstream local blockage distribution and encryption of the throttling channel is increased by about 29.2%, and the maximum net power is increased by 10.5%-11.7%， while the effective mass transfer coefficient is increased by 50.2%-100.7%.
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