Construction of BiOI/BiPO₄ photoelectrochemical sensor for glucose detection

BiOI/BiPO₄ photoelectrode was prepared by a two-step electrodeposition method, and the BiOI/BiPO₄ composite material was first applied to the glucose photoelectrochemical (PEC) monitoring platform. The photoelectrodes were characterized by scanning electron microscopy, X-ray diffraction, UV–vis diffuse reflectance spectrophotometer, and photoelectrochemical measurement. The UV–vis diffuse reflectance spectra showed that the BiOI/BiPO₄ nanocomposites had a strong absorption in the visible region. The BiOI/BiPO₄ electrode showed a linear response in the concentration range of 0.1 μM to 10 mM for glucose with a sensitivity of 0.157 μA mM⁻¹ cm⁻², and the detection limit was 0.0499 μM. In addition, the designed BiOI/BiPO₄ PEC sensor has good reproducibility, long-term stability, and selectivity.