A stoichiometrically stable CdS/TiO2 heterostructured electrode was developed via electrodeposition for efficient photoelectrochemical conversion. The stoichiometry of CdS and its homogeneous distribution over TiO2 nanotubes (TNTs) is paramount to achieve excellent current conversion efficiency and photo-stability. Herein, we report a stable photocurrent density of 3.5 mA cm−2 for an input power density of 50 mW cm−2 for CdS/TiO2 nanotubes (CdS/TNTs), which is 17 times higher than that of bare TNTs. Further, the photo-stability of the photoanode was studied under the sequence of light ON/OFF conditions to verify their durability. Our results show that the photoelectrochemical activity of the CdS/TiO2 heterostructure achieved the highest H2 production rate of 1.1 ± 0.03 mmol h−1 g−1 for the stoichiometry ratio of 1 : 1 without any co-catalysts. The significance of CdS/TiO2 stoichiometry towards efficient hydrogen production is presented and discussed in detail.
