New hydrogen-evolution heteronanostructured photocatalysts: Pt-Nb3 O7 (OH) and Cu-Nb3 O7 (OH)

Area of Science:

• Materials Science
• Nanotechnology
• Photocatalysis

Background:

• Developing efficient photocatalysts is crucial for sustainable energy production.
• Nanorod structures offer high surface area for catalytic applications.

Purpose of the Study:

• To synthesize and characterize Pt- and CuO-decorated Nb3 O7 (OH) nanorods.
• To investigate their performance in solar-powered photocatalytic hydrogen production.

Main Methods:

• Hydrothermal synthesis of Nb3 O7 (OH) nanorods.
• Microwave-assisted solvothermal nucleation and growth for nanoparticle decoration.
• X-ray diffraction, electron microscopy, and spectroscopic analysis for characterization.
• In situ optical absorption spectroscopy to monitor photoreduction.

Main Results:

• Pt-Nb3 O7 (OH) achieved a solar-driven H2 formation rate of 710.4 ± 1.7 μmol g⁻¹ h⁻¹ with 5.40% quantum efficiency.
• CuO-Nb3 O7 (OH) underwent in situ photoreduction to form active Cu-Nb3 O7 (OH).
• The restructured Cu-Nb3 O7 (OH) exhibited a solar-powered H2 production rate of 290.3 ± 5.1 μmol g⁻¹ h⁻¹.

Conclusions:

• Pt- and CuO-decorated Nb3 O7 (OH) nanorods are effective materials for solar-driven hydrogen production.
• The in situ photoreduction of CuO-Nb3 O7 (OH) leads to a catalytically active phase.
• These findings highlight the potential of engineered nanostructures for renewable energy applications.