Highly Dispersion Cu 2 O QDs Decorated Bi 2 WO 6 S-Scheme Heterojunction for Enhanced Photocatalytic Water Oxidation.

Developing suitable photocatalysts for the oxygen evolution reaction (OER) is still a challenging issue for efficient water splitting due to the high requirements to create a significant impact on water splitting reaction kinetics. Herein, n -type Bi 2 WO 6 with flower-like hierarchical structure and p -type Cu 2 O quantum dots (QDs) are coupled together to construct an efficient S-scheme heterojunction, which could enhance the migration efficiency of photogenerated charge carriers. The electrochemical properties are investigated to explore the transportation features and donor density of charge carriers in the S-scheme heterojunction system. Meanwhile, the as-prepared S-scheme heterojunction presents improved photocatalytic activity towards water oxidation in comparison with the sole Bi 2 WO 6 and Cu 2 O QDs systems under simulated solar light irradiation. Moreover, the initial O 2 evolution rate of the Cu 2 O QDs/Bi 2 WO 6 heterojunction system is 2.3 and 9.7 fold that of sole Bi 2 WO 6 and Cu 2 O QDs systems, respectively.