Electrosynthesis of poly-o-diaminobenzene on the Prussian Blue modified electrodes for improvement of hydrogen peroxide transducer characteristics

Electropolymerisation of nonconducting polymer, poly-(1,2-diaminobenzene) on the top of Prussian Blue (PB) modified electrode led to significant improvement of resulting hydrogen peroxide transducer selectivity and operational stability. The reported transducer retained 100% of response during 20 h under the continuous flow of 0.1 mM H2O2, and thus improves the stability level in selective peroxide detection by one order of magnitude. The selectivity value of the PB–poly(1,2-DAB) based H2O2 sensor in relation to ascorbate is approximately 600. No signals to acetaminophen and urate were investigated. PB–poly(1,2-diaminobenzene) modified electrode allows the detection of H2O2 in the flow-injection mode down to 10−7 M with the sensitivity 0.3 A M−1 cm−2, which is only two times lower compared to the uncovered PB based transducer.