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 (H2O2). 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 H2O2. Under a low applied potential of -0.174V, H2O2 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 H2O2.