Electrochemical impedance of the cathode catalyst layer in polymer electrolyte fuel cells

Investigations on degradation of the long-term proton exchange membrane water electrolysis stack

“…5(c)), R U and R ct are decreased and almost arrive at the initial value. Based on the agglomerate model, the microstructure of the porous catalyst layer can be depicted as catalyst particles covered with Nafion polymer electrolyte [20,21]. The catalyst and electrolyte provides catalytic sites and delivery channel of protons, respectively.…”

An impedance model for analysis of EIS of polymer electrolyte fuel cells under hydrogen peroxide formation in the cathode

“…The oxygen concentration at the electrode surface depends on the diffusion of oxygen through the multiphase via parallel and serial paths in the CCL [16]. In the authors' previous study [1] the ratio between oxygen concentrations at the CCL-PEM and CCL-GDL interfaces in the frequency domain was derived to characterise oxygen transport limitations in the impedance response of PEFCs.…”

In-situ investigation on the CO tolerance of carbon supported Pd–Pt electrocatalysts with low Pt content by electrochemical impedance spectroscopy

“…The intersection of HF loop with the real axis represents the total cell ohmic resistance including the membrane resistance, ohmic resistances of other cell components, and contact resistances between each of them [28]. The small HF loop, which is independent on potential, can be attributed to either electronic contact resistance between the electronic supply and the gas diffusion layer (resistance-capacity parallel equivalent circuit) or the ionic omhic drop/double layer charging inside the active layer [29,30]. The large MF loop is responsible for the processes of interface charge transfer, double layer charging and relaxations of the intermediate species.…”