Homogeneous, circular Pt||ZrO2 nanoelectrodes have been synthesized through the sol-gel chemistry and the dip-coating process. These nanoelectrode arrays have been evaluated as a platform for electropolymerization of phenol, as model. We have shown that the microstructure of the polymer depends on the confined environment of the electrode and on the position of the -OH group of the monomer. Additionally, these nanoelectrodes have been tested as an electrochemical sensor for dihydroxybenzene isomers in aqueous medium. These Pt||ZrO (2) nanoelectrodes exhibit a detection limit of 2 x 10(-7) M for resorcinol and 1 x 10(-6) M for catechol.