A nonenzymatic hydrogen peroxide sensor based on chitosan–copper complexes modified multi-wall carbon nanotubes ionic liquid electrode

An electrode was developed for the determination of hydrogen peroxide (H2O2). It contains a chitosan–copper complex onto which multi-wall carbon nanotubes in an ionic liquid were deposited. The modified electrode exhibited excellent electrocatalytic activity that was applied to the detection of H2O2. The pH value and the effect of electrical potential on the current response were optimized. The electrode displays good stability, an expanded linear response range, improved electrocatalytic activity towards H2O2, and enables detection of H2O2 with a linear response from 0.02 to 13 mM of H2O2, with a correlation coefficient of 0.997 and a response time of <6 s. The detection limit is 1.0 μM (at S/N = 3).