AI Article Synopsis
- The study investigates whether rutile TiO2 can produce molecular hydrogen (H2) during methanol photoreforming, given its conduction band edge's proximity to hydrogen's reduction potential.
- Research shows that TiO2(110) single crystal catalysts decorated with platinum clusters facilitate H2 evolution through a unique mechanism.
- This new mechanism positions the co-catalyst as a recombination center for hydrogen rather than acting as a direct reduction site, providing an alternative to traditional photoelectrochemical pathways, especially relevant for reducible semiconductors that allow hydrogen species to diffuse.
Article Abstract
As the conduction band edge of rutile is close to the reduction potential of hydrogen, there is a long-lasting discussion on whether molecular hydrogen can be evolved from this semiconductor. Our study on methanol photoreforming in the ultra-high vacuum reveals that photocatalysts comprising a TiO2(110) single crystal decorated with platinum clusters indeed enable the evolution of H2. This is attributed to a new type of mechanism, in which the co-catalyst acts as a recombination center for hydrogen and not as a reduction site of a photoreaction. This mechanism is an alternative pathway to the commonly used mechanism derived from photoelectrochemistry and must particularly be considered for systems, in which reducible semiconductors enable the surface diffusion of hydrogen species.
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| http://dx.doi.org/10.1039/c8cp05513k | DOI Listing |
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