A dynamic model for the concentration admittance of a polymer electrolyte fuel cell is presented. The takes into account oxygen transport in cathode channel, gas diffusion layer, and catalyst layer. An analytical solution derived. We observe that at air channel outlet not affected by faradaic reactions, it contains information on coefficients cell. measured can be fitted using formula obtained ...

In this research, the spherical gold nanoparticles (AuNPs) were successfully synthesized over fluorine-doped tin oxide glass (FTO) substrate from an additive-free and low-concentration electrolyte. Based on field emission scanning electron microscopy micrograph, AuNPs tend to agglomerate form particles with protrusions outward. The electrochemical impedance spectroscopy shows that Au/FTO has a ...

The influence of the dispersion of pH and concentration of chemicals on zeta potential of kaolinite were investigated. Adding the cationic species led to an increase of the zeta potential, contrary to measuring done in water. The results proved that even a very low concentration of the cationic species (0.001 mol/L) causes a remarkable change of the zeta potential. The zeta potential of the kao...