Electrocatalysis and flow-injection analysis of hydrogen and organic peroxides at CuPtCl6 chemically modified electrodes

Cyclic voltammetry was used to investigate the electrochemical behavior of peroxides, both hydrogen and organic, on the CuPtCl6/GC modified electrode which displayed great electrocatalytic activity in the redox of peroxide. T he results show that the electrochemical processes of peroxide on the CuPtC l6/GC modified electrode are controlled by the diffusion of the species, an d the reduction of dissolved oxygen overlaps with the reduction of H2O2, bu t has no influence on the oxidation of H2O2 The modified electrode was char acterized as an electrochemical sensor for the detection of peroxide, both hydrogen and organic, ina flow-injection system. The electrode exhibited a number of great advantages such as a very wide dynamic range, quite low det ection limits, high stability and short response times and simple preparati on. The linear relationship between the flow-injection peak currents and th e concentrations of H2O2 is in a range of 5 x 10(-8) to 5 x 10(-3) M With a detection limit of 1 x 10(-8) M. The linear response to tert-butyl hydrope roxide (TBHP) is in a range of 1 x 10(5) to 2 x 10(-3) M with a detection l imit of 5 x 10(-6) M.