Research on the High Frequency Resistance Behavior of a Proton Exchange Membrane Fuel Cell during Gas Purge

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Research on the High Frequency Resistance Behavior of a Proton Exchange Membrane Fuel Cell during Gas Purge

Du, Boyu / Wang, Kai / Cong, Ming / Ma, Tiancai / Yang, Yanbo

Water management of proton exchange membrane fuel cell (PEMFC) is an important way to improve the performance and durability of fuel cell. The gas purge process of the PEMFC during shutdown can effectively remove the residual water in the fuel cell. At the same time, gas purge has been a common method to improve the low-temperature cold start possibility of PEMFC by minimizing residual water inside the fuel cell. In this paper, the gas purge process of the PEMFC is studied experimentally. As an important means to characterize the internal water content of the PEMFC, high frequency resistance (HFR) is used to represent the change of water content during gas purge. The effects of purge gas flow, purge time and cell temperature on purge performance were studied, and the purge methods are also compared. The results show that the longer the purge time is, the more water is taken away by gas purge. It can achieve better gas purge performance at higher cell temperature, because of the higher gas evaporation and saturated vapor pressure. The efficiency of gas purge can be significantly improved by increasing the purge gas flow rate both the anode and the cathode. In addition, changing the gas purge method, such as purge the anode or cathode side only, the HFR of fuel cell increases more rapidly than the method of simultaneous gas purge in both sides, and the effect of single anode purge is better than that of single cathode side purge, but the HFR will drop a lot at the end of purge.