An amperometric nitrobenzene electrochemical sensor based on electrochemically activated graphite modified screen printed carbon electrode

In the present study involves the fabrication of amperometric sensor for the detection of nitrobenzene (NB) using electrochemically activated graphite (EAG) modified screen printed carbon electrode (SPCE). The EAG modified SPCE was prepared by a simple electrochemical activation of graphite in PBS containing KCl solution at an applied potential of 2.0 V for 300 s. The EAG modified SPCE showed a good electrocatalytic reduction behavior towards NB with a lower overpotential than that of other modified SPCEs. Amperometric results reveals that the reduction peak current of NB was linear over the concentrations from 0.3 to 374.5 μM. The response time of the sensor was calculated as 5 s. The sensitivity was found as 1.445 μAμM^-1 cm^-2 with the detection limit of 0.06 μM for NB. In addition, the fabricated electrode showed a good selectivity for NB in the presence of nitroaromatic and phenolic compounds with good operational stability.