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Heterogeneous Catalysis

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Ordered mesoporous black TiO(2) as highly efficient hydrogen evolution photocatalyst.

Wei Zhou¹, Wei Li, Jian-Qiang Wang

¹Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University , Harbin 150080, P. R. China.

Journal of the American Chemical Society

|June 18, 2014

Summary

Researchers developed ordered mesoporous black titanium dioxide (OMBT) for efficient photocatalytic hydrogen evolution. These OMBT materials show enhanced solar-driven hydrogen production, nearly doubling the rate of pristine titanium dioxide.

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Area of Science:

Materials Science
Nanotechnology
Photocatalysis

Background:

Mesoporous titanium dioxide (TiO2) is of significant interest due to its versatile properties and applications.
Developing advanced TiO2 materials is crucial for improving photocatalytic efficiency.

Purpose of the Study:

To synthesize ordered mesoporous black TiO2 (OMBT) materials.
To evaluate the photocatalytic hydrogen evolution performance of the synthesized OMBT materials.

Main Methods:

Facile synthesis of OMBT using a thermally stable, high-surface-area mesoporous TiO2 precursor.
Hydrogenation process at 500 °C to maintain structural integrity and prevent phase transformation.
Characterization of surface area, pore size, and pore volume of the resultant materials.

Main Results:

OMBT materials were successfully synthesized with a surface area of ~124 m²/g, pore size of ~9.6 nm, and pore volume of 0.24 cm³/g.
The OMBT materials exhibited extended photoresponse from UV to visible and infrared light.
A high solar-driven hydrogen production rate of 136.2 μmol/h was achieved, nearly double that of pristine mesoporous TiO2.

Conclusions:

The facile synthesis method effectively produces OMBT with desirable structural properties.
OMBT demonstrates superior photocatalytic hydrogen evolution performance compared to pristine mesoporous TiO2.
These findings highlight the potential of OMBT for efficient solar energy conversion and hydrogen production.