Efficient visible-light-driven photocatalytic H2 evolution over MoO2-C/CdS ternary heterojunction with unique interfacial microstructures

Abstract

Molybdenum-based co-catalyst decoration is a promising strategy in the construction of an highly efficient photocatalyst composite for hydrogen evolution utilizing sunlight. In this work, a novel MoO2-C/CdS (MOCCS) ternary heterojunction photocatalyst with unique interfacial microstructures has been successfully constructed. The interfacial disordered MoOx regions, which act as the main active sites for photocatalytic water splitting, can be found in the MoO2-C nanocomposites. While for the ternary heterojunction, the direct interfacial Mo-S bonds and metallic Cd can guarantee the high-effect interfacial charge separation and transfer between MoO2-C and CdS nanorods. The as-prepared MOCCS composite shows a remarkable enhancement of photocatalytic H2 evolution performance (∼16.08 mmol·h−1 g−1), which is up to 33 times as high as that of pure CdS nanorods. Photoelectrochemical analyses demonstrate that the synergetic effect of unique interfacial microstructures will result in the efficient separation and reaction of the photocarriers, and the reduced hydrogen overpotential during photocatalytic water splitting process.