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 BiVO4 film electrode is fabricated by electrodeposit of nanoporous BiOI film on fluorine-doped tin oxide glass (FTO) and subsequent conversion to BiVO4 by annealing at elevated temperature. The electrode exhibits excellent visible light photoelectrochemical activity, and H2O2 works as a hole scavenger to react with light-induced electron holes on the valence band of BiVO4. Upon illumination and at applied bias potential of + 0.2 V, the photocurrent density is linearly correlated to the concentration of H2O2. The linear determination range of H2O2 is 9.54-764.76 mM with a corresponding correlation coefficient of 0.9997, a detection limit of 1.59 mM (S/N= 3), and sensitivity of 182.6 mu A 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 H2O2 and displays a promising prospect for non-enzyme PEC H2O2 sensor.