固体润滑国家重点实验室（LSL）知识库

Bismuth vanadate (BiVO₄) has been widely studied as a promising candidate for oxygen evolution in artificial photosynthesis. However, it was seldom used in hydrogen generation because of its low conduction band and high reaction overpotential. Here, we proposed an effective strategy to address these issues by distributing BiVO₄ quantum dots onto nanostructured tin oxide (SnO₂). The nanostructured SnO₂ simultaneously served as the host substrate and a passivation layer. Carbon quantum dots were also used to improve the charge transfer and electrocatalytic properties at the BiVO₄-SnO₂ interface. As expected, the final composite yields a net photo-current of 2.2 mA cm^-2 at 0.6 V vs. Ag/AgCl, and a hydrogen generation rate of 0.54 μmol.h^-1 without bias. The excellent performance was due to the enhanced electron energy, effective charge separation at the BiVO₄-SnO₂ interface, and the fast hole transfer from BiVO₄ to carbon quantum dots and electrolyte.