Elettrodi modificati con nanomateriali di carbonio: ottimizzazione della sintesi di idrossidi doppi a strati

In this thesis work, it has been studied the effect of carbonaceous nanomaterials like graphene and nanotubes on GC electrodes, in various configurations, to perform the synthesis of the layered double hydroxide of nickel and aluminium. The potentiodynamic electrodeposition was found more efficient as to Ni centres electroactivity and more reproducible than potentiostatic or galvanostatic electrodeposition. It has been performed a structural characterization by means of XRD analysis (which confirmed the typical hydrotalcitical pattern) and a morphological characterization by means of SEM analysis, from which it was observed a homogeneous and well adherent coating, except for the bilayer configurations. It was carried out an electrochemical characterization to evaluate the electroactive surface area, that was found to be significantly increased in the presence of graphene, and the charge transfer resistance, that was lower when the nanomaterials were present. The modified electrodes were then tested in practical applications like the glucose determination and the oxygen evolution reaction.