Abstract: An electron transfer reaction between ferrocene and dopamine (DA) in a aqueous solution and oxidizing agent in an organic solution immiscible with water was studied by thin-layer cyclic voltammetry(TLCV) for charge transfer on the liquid/liquid(L/L) interface. The bimolecular rate constants(k) were obtained and one electron transfer process on the interface could be observed. The oxidation reaction of DA on the L/L interface by above method was discussed in comparison with the result obtained by scanning electrochemical microscopy (SECM) and got a reasonable agreement between them, which could give a prove to the practicality of TLCV. Otherwise, lower concentration ratios K_r of aqueous to organic reactants were adopted, which gave an evidence to the proposed procedure of Barker.

Key words: Dopamine (DA), Thin-layer cyclic voltammetry (TLCV), Electron transfer(ET), Scanning electrochemical microscopy (SECM)