关键词: 金, 电沉积, 微电极, 玻碳, 铂

Abstract: The initial stage electrodeposition behaviors of gold onto glassy carbon and platinum microelectrodes are studied in an acid solution containing AuCl_3using cyclic voltammetry and potential step techniques. The results suggest that gold nucleation on microelectrodes requires a higher driving force with high probability. Within the range of the microelectrode dimension that have been used in the present work, large amount of gold nucleus could be formed at short time scale at overpotentials higher than a threshole value. The It curves from the platinum microelectrode are in consistence with the continuous nucleation model. It has been found that the deosition history of the glassy carbon microelectrode substrate has strong influences on subsequent electrodeposition behavior while the platinum microelectrode does not show such effects.