Electrochemical behavior of stable cinder/Prussian blue analogue and its mediated nitrite oxidation

Prussian blue (PB) is electrochemically trapped directly on the interlayer resume of cinder-containing carbon paste electrodes (cinder/PB-CPEs). A UV- visible spectroscopic study gives supportive evidence for the formation of PB in the cinder matrix. This hybrid cinder/PB-CPE shows similar redox beha vior to that of electrochemically synthesized PB film on the surface of a g lassy carbon electrode. Nevertheless, the physical and electrochemical acti vities are comparatively Superior over the classical PB electrodes. The ele ctrochemical features, such as, high surface excess, positive site-site int eraction parameter together with low film resistance result in good electro chemical activity and stability of the cinder/P13-CPE. The cinder/PB-CPE is further utilized for the mediated oxidation of nitrite. Mechanistic parame ters, such as, anodic transfer coefficient, Tafel slope, and standard heter ogeneous second order rate constant were evaluated as 0.52, 114.3 mV/decade , and 8.36 mol(-1) dm(3) s(-1), respectively. The catalytic scheme was then extended to analytical applications with a linear range up to 1600 muM (re gression coefficient = 0.9996) and a detection limit (S/N = 3) of 3.36 muM.