Electrodeposition of a nickel-based hydrotalcite on Pt nanoparticles for ethanol and glucose sensing

Two different substrates, GC and graphite electrodes, have been coated with electrodeposited Pt nanoparticles (PtNPs) of different morphologies and sizes (from 2 μm to 20 nm). The electrochemical behavior of the platinised GC electrodes has been mainly evaluated in terms of the increase of the real surface area. A nickel-based hydrotalcite-like compound (HT) has been electrosynthesised on the GC platinised electrodes, by the cathodic reduction of a 0.03 M Ni and Al nitrates solution, and the cyclic voltammetric responses to these electrodes have been measured in a 0.1 M NaOH solution. Finally, the electrocatalytic performances of the GC–PtNPs–HT electrodes to ethanol and glucose have been investigated and compared with the performances of HT electrodeposited onto bare Pt, in the same conditions.