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) (PEMElm-Cl) incorporated with locally generated palladium nanoparticles was first studied, which exhibits evidently different electrochemical behavior with the PEMElm-Cl brushes in electrolyte solution. The PEMElm-Cl brush containing Pd nanoparticles exhibits high electrocatalytic activity for the reduction of oxygen. Furthermore, the electrocatalytic activity of PEMElm-CI/Pd brush for oxygen reduction was highly tunable by changing the thickness of the composite film. (C) 2007 Elsevier B.V. All rights reserved.