TiO2 Nanoparticles Co-Sensitized with Graphene Quantum Dots and Pyrocatechol Violet for Photoelectrochemical Detection of Cr(VI)

Photoactive electrodes with high photon-to-electron conversion efficiency are key to achieving sensitive photoelectrochemical sensors. Among all the photoactive materials, titanium dioxide (TiO2) nanoparticles have attracted much attention due to their unique electronic and optical properties. However, the large bandgap of TiO2 results in limited photocurrent signal generation under visible irradiation, which is important for its use in many …