Poly(neutral red) on passivated nickel films. New insights through EQCM measurements

Poly(Neutral Red) (PNR) has been electrogenerated on a passivated Ni surface. PNR was chosen due to the fact that its electroactivity region overlaps with the Ni dissolution/deposition process. Therefore, both electrochemical processes can compete and by this way, there are evidences about the formation of a Ni(OH)2/PNR composite. It was investigated by classical EQCM and the instantaneous mass/charge ratio (F(dm/dQ)) analysis shed light on the active/passive transition and nickel trans-passive dissolution mechanisms.