Three-dimensional MoS2-CdS-γ-TaON hollow composites for enhanced visible-light-driven hydrogen evolution

Area of Science:

• Materials Science
• Nanotechnology
• Photocatalysis

Background:

• Developing efficient photocatalysts is crucial for sustainable hydrogen production.
• Noble metal co-catalysts often limit the cost-effectiveness and scalability of photocatalytic systems.
• Hollow nanostructures offer high surface area and enhanced mass transport for improved performance.

Purpose of the Study:

• To synthesize novel three-dimensional (3D) molybdenum disulfide-cadmium sulfide-tantalum oxynitride (MoS2-CdS-γ-TaON) hollow composites.
• To investigate the photocatalytic activity of these composites for hydrogen production.
• To evaluate the performance of the composite without noble-metal co-catalysts.

Main Methods:

• A two-step ion-exchange route was employed.
• Hydrothermal processing assisted the synthesis.
• MoS2-CdS nanocrystals were anchored onto γ-TaON hollow spheres.

Main Results:

• Successfully synthesized 3D MoS2-CdS-γ-TaON hollow composites.
• The composite with 1 wt% MoS2/CdS (0.2 wt% MoS2) exhibited a high photocatalytic hydrogen production rate of 628.5 μmol h(-1).
• High performance was achieved even without the use of noble-metal co-catalysts.

Conclusions:

• The synthesized MoS2-CdS-γ-TaON hollow composites demonstrate excellent photocatalytic activity for hydrogen production.
• The absence of noble metals in the co-catalyst system highlights the material's economic viability.
• The unique hollow structure and synergistic effects of the components contribute to the enhanced performance.