Degradation forecast for PEMFC cathode-catalysts under cyclic loads

Analytical modeling framework for performance degradation of PEM fuel cells during startup–shutdown cycles

“…33 Consequently, large particles grow at the expense of dissolution of the smaller ones, leading to the increase in the mean radius of platinum particles and the decrease of the particle number. The coarsening of platinum particles 34,35 can be written as…”

“…Based on the detachment of Pt particles 6 and collapse of porous structure 11 caused by carbon corrosion, the platinum loading and volume of void space were assumed to decrease proportionally to the carbon load loss for the sake of simplicity. Meanwhile, the ECSA and radius of agglomerate during voltage cycles are obtained according to eqn (34) and (35), respectively, in Section 2.3. The agglomerate model of CL is a performance calculator to obtain the distribution of overpotential, current density, and other parameters.…”

Effect of electrode Pt-loading and cathode flow-field plate type on the degradation of PEMFC

“…Repeated rapid potential cycling can lead to the mixed state of Pt catalyst with various structural conditions, which may cause the degradation of cathode Pt catalyst [32] . In addition, there is report that rapid potential variation can lead to Pt oxidation and dissolution [33,34] , and for Ostwald ripening, small particles shrink and the other big particles grow [35] . All these factors lead to the growing up and aggregation of Pt particles.…”

Modeling of polymer electrolyte membrane fuel cell with circular and elliptical cross-section gas channels: A novel procedure

“…A typical PEMFC comprises 3 main parts: the anode, the membrane, and the cathode. The anode and cathode sides include bipolar plate, gas channel, gas diffusion layer, and catalyst layer . The humidified air and the hydrogen gas enter the cathode and anode channels, respectively.…”

“…The anode and cathode sides include bipolar plate, gas channel, gas diffusion layer, and catalyst layer. [5][6][7][8][9] The humidified air and the hydrogen gas enter the cathode and anode channels, respectively. A hydrogen molecule diffuses through the anode diffusion layer towards the catalyst layer where it divides into H + and electrons:…”