Acceleration of potential-induced reconstruction on Au(1 0 0) electrode by dopamine and its inhibition as an effect of dopamine oxidation

Voltammetric measurements have been employed to asses the stability of the unreconstructed Au(1 0 0) electrode against potential-induced reconstruction in a solution containing dopamine. As follows from voltammetric responses this process is much faster in the presence of protonated molecules of dopamine (DH+) than when other organic compounds e.g. pyridine or thiourea are added to the supporting electrolyte (as till now observed) and becomes slightly slower than in the supporting electrolyte as an effect of dopamine electrooxidation. The above mentioned experimental observations were confirmed by kinetics studies of this process for the systems under consideration.