Ni/Al Layered double hydroxide nanoparticles modified carbon paste (Ni/Al- LDH/NMCP) electrode was prepared as a new electrode. The Ni/Al-LDH/NMCP electrode was prepared by grinding the mixture of graphite powder and silicon oil (as a binder) with sufficient amount of Ni/Al Layered double hydroxide. Then, the electrode was placed in 0.1 M NaOH and the electrode potential was cycled between 0 and 700 mV (vs. Ag/AgCl) at a scan rate of 50 mVs−1 for 20 cycles in a cyclic voltammetry regime until a stable voltammogram was obtained. Electrocatalytic activity of the modified electrode was used for the oxidation of methanol, in aqueous alkaline solution. Results showed that, the electrocatalytic activity of the Ni/Al-LDH/NMCP electrode is much higher than those of unmodified carbon paste electrode under similar experimental conditions, showing the possibility of attaining good electrocatalytic anodes for fuel cells. Kinetic parameters such as the electron transfer coefficient (α) and the number of electrons involved in theratedetermining step (nα) for the oxidation of methanol were determined utilizing cyclic voltammetry (CV). The modified electrode shows stable and linear responses in the concentration range of 0.01 to 0.1 mol L-1.
کلید واژگان :Ni/Al Layered Double Hydroxide, Modified Carbon Paste Electrode, Electrocatalytic Oxidation, Methanol, Kinetic
ارزش ریالی : 600000 ریال
با پرداخت الکترونیک