Formation of a robust and stable film comprising ionic liquid and polyoxometalate on glassy carbon electrode modified with multiwalled carbon nanotubes: Toward sensitive and fast detection of hydrogen peroxide and iodate

摘要

A robust and stable film comprising n-octylpyridinum hexafluorophosphate ([C_8Py][PF_6]) and 1:12 phosphomolybdic acid (PMo_(12)) was prepared on glassy carbon electrodes modified with multiwall carbon nanotubes (GCE/MWCNTs) by dip-coating. The cyclic voltammograms of the GCE/MWCNTs/[C_8Py][PF_6]-PMo_(12) showed three well-defined pairs of redox peaks due to the PMo_(12) system. The surface coverage for the immobilized PMo_(12) and the average values of the electron transfer rate constant for three pairs of redox peaks were evaluated. The GCE/MWCNTs/[C_8Py][PF_6]-PMo_(12) showed great electrocatalytic activity towards the reduction of H_2O_2 and iodate. The kinetic parameters of the catalytic reduction of hydrogen peroxide and iodate at the electrode surface and analytical features of the sensor for amperometric determination of hydrogen peroxide and iodate were evaluated.