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A ruthenium-mediated photoelectrochemical sensor was developed for the detection of BPA, using molecularly imprinted polymers (MIPs) as the recognition element, a tin oxide (SnO₂) nanoparticle-modified ITO as the electrode, and a blue 473-nm LED as the excitation light source. Photoelectrochemical oxidation of BPA on SnO₂ electrode was achieved by [Ru(bpy)₃]²⁺ under the irradiation of light. It was found that BPA was oxidized by Ru³⁺ species produced in the photoelectrochemical reaction, resulting in the regeneration of Ru²⁺ and the concomitant photocurrent enhancement. MIPs film was prepared by electropolymerization of pyrrole on SnO₂ electrode using BPA as the template. Surface morphology and properties of the as-prepared electrode were characterized by SEM, electrochemical impedance spectroscopy, and photocurrent measurement. In the presence of BPA, an enhanced photocurrent was …