Interconnected Periodic Macroporous NaNbO₃ for High-Efficiency Solar-Driven Photocatalytic Hydrogen Evolution.

Area of Science:

• Materials Science
• Nanotechnology
• Photocatalysis

Background:

• Highly ordered periodic macroporous structures enhance photocatalytic activity.
• Constructing 3D interconnected ordered porous ternary nanostructures with crystalline frameworks is challenging.

Purpose of the Study:

• To design and fabricate 3D interconnected periodic macroporous sodium niobate (PM NaNbO3).
• To enhance surface-active sites and optimize photogenerated carrier-transfer efficiency for photocatalysis.

Main Methods:

• Fabrication of 3D interconnected periodic macroporous NaNbO3.
• Incorporation of Platinum (Pt) as a cocatalyst.
• Evaluation of photocatalytic hydrogen generation rates.

Main Results:

• PM NaNbO3 demonstrated a hydrogen generation rate of 10.04 mmol h-1 g-1 with Pt cocatalyst.
• This rate is 6x higher than calcined NaNbO3 (C-NaNbO3) and 5x higher than hydrothermal NaNbO3 (H-NaNbO3).
• Performance attributed to interconnected pores, large surface area, enhanced light absorption, and efficient charge carrier dynamics.

Conclusions:

• The developed PM NaNbO3 offers a novel approach for designing hierarchically porous materials.
• This material shows significant potential for efficient solar-driven hydrogen production.
• Synergistic effects in the material architecture are key to its enhanced photocatalytic activity.