Electrochemical impedance spectroscopy of poly (1-ethyl 3-(2-methacryloyloxy ethyl) imidazolium chloride) brushes with locally generated Pd

The electrochemical impedance spectroscopy of polyelectrolyte brushes (poly (1-ethyl 3-(2-methacryloyloxy ethyl) imidazolium chloride) (PEMEIm-Cl) incorporated with locally generated palladium nanoparticles was first studied, which exhibits evidently different electrochemical behavior with the PEMEIm-Cl brushes in electrolyte solution. The PEMEIm-Cl brush containing Pd nanoparticles exhibits high electrocatalytic activity for the reduction of oxygen. Furthermore, the electrocatalytic activity of PEMEIm-Cl/Pd brush for oxygen reduction was highly tunable by changing the thickness of the composite film.