“…It should be noted that photoactive materials play a crucial role in the performance of PEC sensors. Owing to the strong oxidizing power, photostability, and environmental benignity, various titanium dioxide (TiO 2 )-based visible-light-responsive photoactive composites (e.g., CdSe x Te 1 À x -sentisized TiO 2 , metal-doped TiO 2 , polymerhybridized TiO 2 and CdTe-cosensitized TiO 2 /CdS:Mn) for PEC sensing have been explored (Kang et al, 2010;Li et al, 2014;Wang et al, 2013;Fan, L.F., et al, 2014). Despite these advances, the relatively sophisticated fabrication methods as well as tedious coupling procedures have seriously hampered their applications.…”