A Non-enzymatic Hydrogen Peroxide Photoelectrochemical Sensor Based on a BiVO4 Electrode

In this study, a non-enzymatic hydrogen peroxide photoelectrochemical (PEC) sensor based on nanoporous BiVO 4 film electrode is fabricated by electrodeposit of nanoporous BiOI film on fluorine-doped tin oxide glass (FTO) and subsequent conversion to BiVO 4 by annealing at elevated temperature. The electrode exhibits excellent visible light photoelectrochemical activity, and H 2 O 2 works as a hole scavenger to react with light-induced electron holes on the valence band of BiVO 4 . Upon illumination and at applied bias potential of +0.2 V, the photocurrent density is linearly correlated to the concentration of H 2 O 2 . The linear determination range of H 2 O 2 is 9.54–764.76 μM with a corresponding correlation coefficient of 0.9997, a detection limit of 1.59 μM (S/N=3), and sensitivity of 182.6 μA mM −1 cm −2 . The optimum bias potential, most suitable film thickness, anti-interference performance, and impedance are also explored. The sensor shows good response towards H 2 O 2 and displays a promising prospect for non-enzyme PEC H 2 O 2 sensor.