The diffusion overpotential increase and appearance of overlapping arcs on the Nyquist plots in the low humidity temperature test conditions of polymer electrolyte fuel cell

Effect of polytetrafluoroethylene distribution in the gas diffusion layer on water flooding in proton exchange membrane fuel cells

“…Liquid water in MEAs arises from condensed humidified vapor and as a product of oxygen reduction, some of which is necessary for maintaining the ionic conductivity of the membrane and catalyst layer (CL). Excess water may occlude active sites for electrochemical reaction and affect the gas permeability [6][7][8]. Most water is transported out of the cathode CL and accumulates at the interface between the CL and GDL before draining from the MEA through the GDL by capillary action [9].…”

Ultraviolet-Induced Bi-gradient Gas Diffusion Electrode for High-Performance Fuel Cells

“…In the Nyquist plots, g-CL/g-GDL presented a pronounced but small arc at low frequencies, suggesting that g-CL/g-GDL exhibited a lower gas-diffusion resistance. 32 For an accurate and specific comparison, the Nyquist plots were fitted and the results are displayed in Figure S7b. 33 It was shown that g-CL/g-GDL possessed a lower gasdiffusion resistance of 0.07 Ω cm 2 , which was significantly smaller than that of the commercial GDE (0.21 Ω cm 2 ).…”

Investigation of water transport in fuel cells using water transport plates and solid plates

“…Resulting from more electrochemical active sites, the diffusion length of oxygen is shorter, which reduces the mass transport polarization. 34 …”

“…Resulting from more electrochemical active sites, the diffusion length of oxygen is shorter, which reduces the mass transport polarization. 34 For further study water transport process inside fuel cell, water transport was tested as shown in Table 4. The smallest anode water content is mainly due to lack of back diffusion at inlet of fuel cell resulting from lowest gas humidity.…”