A New and Simple Electrocatalyst for Formaldehyde Oxidation; Nickel/poly(o-Anisidine)/Film Modified Ionic Liquid Carbon Paste Electrode

摘要

In present work, the ionic liquid, 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide was incorporated in the carbon paste electrode as the binder (IL-CPE). O-anisidine (OA) monomer is electropolymerized in the presence of an aqueous acidic solution onto IL-CPE (POA/IL-CPE). The as-prepared substrate is used as a porous matrix for dispersion of Ni(Ⅱ) ions by immersing the modified electrode in a nickel(Ⅱ) nitrite solution. The modified electrodes are characterized by scanning electron microscopy (SEM) and electrochemical methods. The POA/IL-CPE was applied successfully to highly efficient (current density of 18.2 mA cm~(-2)) electrocatalytic oxidation of formaldehyde in alkaline medium. Finally, the rate constant for chemical reaction between formaldehyde and redox sites of the electrode was calculated.