Enhanced photoelectrocatalytic degradation of phenols with bifunctionalized dye-sensitized TiO2 film

► Bifunctionalized TiO2 film with a dye-sensitized region and a degradation region. ► Electrons and positive charges induced by visible light participate in degradation. ► The degradation efficiency is enhanced remarkably by external potential. ► 99% removal of 4-chlorophenol was achieved by this device after 2 h.