Electrochemical sensor for detection of hydrogen peroxide modified with prussian blue electrodeposition on nitrogen, phosphorus and sulfur co-doped porous carbons-chitosan.

Nitrogen, phosphorus and sulfur co-doped porous carbons (N, P, S@PC) were well dispersed in the chitosan (CS) acid solution, in particular via covalently interaction, which could avoid the aggregation of N, P, S@PC in most solvents. Moreover, CS could also avoid N, P, S@PC leakage from the modified electrode. A novel electrochemical sensor was then developed through prussian blue (PB) was electrodeposited on the glass carbon (GC) electrode modified with N, P, S@PC-CS composite. Results with scanning electron microscopy image, illustrate that PB/N, P, S@PC-CS composite distributes very uniformly on the substrate surface, which is hoped to be very attractive for determination of hydrogen peroxide (H2 O2 ). Due to synergistic effect between PB and N, P, S@PC, the PB/N, P, S@PC-CS/GC electrode exhibited excellent conductive and electrocatalytical activity towards H2 O2 . Under a low applied potential of -0.174V, H2 O2 could be linearly detected from 0.4μM to 2.0mM with a low detection limit of 0.2μM (S/N=3) and fast response time of 2s. These results indicate that the electrochemical sensor prepared with PB/N, P, S@PC- CS composite has promising applications for real analysis applications of H2 O2 .