Electrogenerated chemiluminescence of bismuth sulfide nanorods modified electrode in alkaline aqueous solution

Electrogenerated chemiluminescence (ECL) behavior of a bismuth sulfide nanorods modified glassy carbon electrode (NR-GCE) was investigated in alkaline aqueous solution for the first time. One weak ECL peak of the NR-GCE was observed around −1.70 V when the electrode potential was scanned from 0.0 V to −2.0 V. The intensity of the ECL peak was enhanced greatly in the presence of either H 2 O 2 or persulfate. The dissolved oxygen, the pH and the supporting electrolytes of the working solution could influence ECL emission noticeably. Under the optimal conditions, the ECL signal displayed a good linear relationship with the concentration of hydrogen peroxide in the range of 5.0 × 10 −7 to 1.0 × 10 −4 mol L −1 with a correlation coefficient of 0.997 and a detection limit of 2.0 × 10 −7 mol L −1 at the signal-to-noise ratio of 3. A possible ECL mechanism of the NR-GCE was also proposed. Electrogenerated chemiluminescence of Bi 2 S 3 nanorods modified glassy carbon electrode is reported in aqueous alkaline solution, and can be enhanced greatly in the presence of K 2 S 2 O 8 or H 2 O 2 . The modified electrode could be used as a sensitive biosensor for H 2 O 2 .