A Tandem 0D/2D/2D NbS 2 Quantum Dot/Nb 2 O 5 Nanosheet/g-C 3 N 4 Flake System with Spatial Charge-Transfer Cascades for Boosting Photocatalytic Hydrogen Evolution.

The relatively high recombination rate of charges remains the most critical limiting factor for solar-driven water splitting for hydrogen generation. Herein, a tandem 0D/2D/2D NbS(2)quantum dot/Nb(2)O(5)nanosheet/g-C(3)N(4)flake (NSNOCN) system is designed. Owing to the unique spatial-arrangement and elaborate morphology of 0D NbS2, 2D Nb2O5, and 2D g-C(3)N(4)in the newly designed NSNOCN, plenty of spatial charge-transfer cascades from g-C(3)N(4)to NbS(2)via Nb(2)O(5)are formed to accelerate separation and transfer of charges significantly, thus contributing to a high photocatalytic H(2)generation rate of 13.99 mmol h(-1)g(-1)(an apparent quantum efficiency of 10.8% at 420 nm), up to 107.6 and 43.7 times by contrast with that of g-C(3)N(4)and Nb2O5, respectively. This work can provide a new platform in the design of artificial photocatalytic systems with high charge-transfer efficiency.