Short-Distance Hydrogen Spillover on an Isolated Amorphous RuTe_x Cocatalyst for Superior Photocatalytic H₂ Evolution

Area of Science:

• Materials Science
• Catalysis
• Photochemistry

Background:

• Hydrogen spillover is crucial for hydrogen evolution but limited by long pathways and high resistance in conventional catalysts.
• Designing catalysts with optimized hydrogen spillover is key for efficient photocatalytic hydrogen production.

Purpose of the Study:

• To develop an efficient short-distance hydrogen-spillover pathway using isolated amorphous RuTe_x cocatalysts on TiO₂.
• To enhance the photocatalytic H₂-evolution activity of TiO₂ through improved hydrogen spillover.

Main Methods:

• Synthesis of isolated amorphous RuTe_x nanoparticles loaded onto TiO₂.
• Investigation of electron transfer and electronic structure changes at the RuTe_x/TiO₂ interface.
• Measurement of photocatalytic H₂-production rates under alkaline conditions.

Main Results:

• A distance-dependent electron transfer from RuTe_x to TiO₂ was observed, creating a gradient in electron density within RuTe_x nanoparticles.
• Two distinct functional regions were established: strong H-adsorption at the interface and strong H-desorption away from it.
• The RuTe_x/TiO₂ composite exhibited a photocatalytic H₂-production rate of 3.47 mmol·g^-1·h^-1, 81.6 times higher than pure TiO₂.

Conclusions:

• The developed isolated amorphous RuTe_x cocatalyst enables efficient short-distance hydrogen spillover.
• This approach significantly enhances the photocatalytic H₂-evolution activity of TiO₂.
• The study provides a new strategy for designing advanced catalysts for H₂ generation.