In situ loading CuO quantum dots on TiO2 nanosheets as cocatalyst for improved photocatalytic water splitting

Converting solar energy to product hydrogen fuel thought photocatalytic water splitting has been considered as one of the most promising strategies to address the aggravated energy crisis and environmental problems. Here, we demonstrate a facial strategy to prepare copper oxide (CuO) quantum dots decorated TiO2 nanosheets with exposed {001} facets. As a result, the CuO/TiO2 heterostructure exhibit high photocatalytic performance with a H2 evolution rate of ∼0.04 mmol h−1, and the value is 20 times higher than that of the pure TiO2 nanosheets. The as-prepared samples were characterized and investigated by XRD, SEM, TEM, XPS, UV-vis, PL spectra and electrochemical analysis. The significantly improved photocatalytic performance was attributed to the improved light absorption and efficient separation of high energy electrons. This work provides a new insight to enhance the photocatalytic properties of noble metal free through the rational design of the heterojunctions. We report the preparation of the CuO/TiO2 heterojunction as an advanced photocatalysts for water splitting. The 5% content CuO modified TiO2 nanosheets exhibited the highest photocatalytic activity with a H2 evolution rate of ∼0.04 mmol h−1, and showed good stability with 5 cycles of 15 h. [Display omitted] •The CuO/TiO2 heterojunctions were synthesized and used for photocatalytic H2 production.•Excellent photocatalytic activity of ∼0.04 mmol h−1 over the 5% CuO/TiO2 is achieved.•The 5% CuO/TiO2 exhibits good stability with 5 cycles of 15 h.