Zhang et al. studied the influence of cathode side stoichiometry, pressure, and relative humidity on performance; a higher mass flow rate of air and more back pressure at saturated conditions improve the performance. Li et al. investigated the performance of a PEMFC with a thin membrane. It was demonstrated how oxygen transport resistance, pressure, and relative humidity affect performance. It was shown that in a thin membrane, hydrogen crossover increases. The influence of pressure, temperature, relative humidity, and the porosity of the GDL on the performance of a single channel PEMFC was studied by Jin et al. . Two Correlations for oxygen molar concentration and current density were presented, and it was declared that pressure is the most pivotal factor in performance. The impact of temperature, relative humidity, pressure, and depth and width of the channel of a parallel cathode flow field PEMFC were investigated by Carcadea et al. . They showed that low relative humidity and high temperature and pressure improve cell performance, and smaller channels have superior performance. Santarelli and Torchio studied the influence of relative humidity, temperature, and pressure on performance. Their findings showed that reducing relative humidity in low voltages is better, and pressure's effect at dry inlets is lower. In an investigation, Chen et al. studied the influence of operating conditions on the performance of a multi-channel serpentine PEMFC.