Influence of thiourea on silver deposition: Spectroscopic investigation

B. REENTS; W. PLIETH; V.A. MACAGNO; G. I. LACCONI*

JOURNAL OF ELECTROANALYTICAL CHEMISTRY

ELSEVIER

Lugar: Amsterdam; Año: 1998 vol. 453 p. 121 - 127

0022-0728

The interfacial behaviour of thiourea (TU) in perchloric acid solutions on glassy carbon electrodes during silver electrodeposition has been studied using surface enhanced Raman spectroscopy (SERS). The spectroscopic results are compared with those obtained on electrochemically activated silver electrodes. Potential-dependent thiourea adsorption (occurring via sulphur) and ClO4  coadsorption are observed. No evidence for the adsorption of solution silver?thiourea complexes regardless of TU concentration was found. The time evolution of the TU SERS signals during the electroreduction of silver is a function of the crystallite formation (nucleation) and stabilization