Recent advances in extending the light absorption range of titania (TiO₂) into the visible region has resulted in a new material, i.e. black TiO₂ with a bandgap around 1.5 eV. Black TiO₂ is a promising candidate for photo-(electro)catalysis under near infrared light owing to its narrow band gap and its improved electronic conductivity which only limited attention has been paid to it to use as a photoelectrochemical sensor. Using photo-electrocatalysts in stationary electrochemical systems commonly face poisoning phenomena due to the generated product seriously affecting the electrochemical detection. In order to improve the recyclability of the photo-electrocatalyst, a flow photoelectrochemical cell is the best choice due to continues movement of a carrier solution to the electrode surface. The combination of a flow cell and an electrochemical setup integrates the benefit of two systems such as high mass diffusion, much lower amount of sample requirements, while warranting strong signals and a high detection sensitivity. The core idea of the proposal is to synthesize and exploit black (reduced) titania as a highly visible light responsive material in a flow analysis setup to detect polyphenols via photo-electrochemistry. Collaboration project.