Operando Laboratory X-ray Absorption Spectroscopy and UV–Vis Study of Pt/TiO 2 Photocatalysts during Photodeposition and Hydrogen Evolution Reactions.

Autor: Kozyr, Elizaveta G., Njoroge, Peter N., Chapek, Sergei V., Shapovalov, Viktor V., Skorynina, Alina A., Pnevskaya, Anna Yu., Bulgakov, Alexey N., Soldatov, Alexander V., Pellegrino, Francesco, Groppo, Elena, Bordiga, Silvia, Mino, Lorenzo, Bugaev, Aram L.
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Zdroj: Catalysts (2073-4344); Feb2023, Vol. 13 Issue 2, p414, 10p
Abstrakt: Photocatalytic hydrogen (H2) production is a promising route for alternative energetics. Understanding structure–activity relationships is a crucial step towards the rational design of photocatalysts, which requires the application of operando spectroscopy under relevant working conditions. We performed an operando investigation on a catalytic system during the photodeposition of Pt on TiO2 and photostimulated H2 production, using simultaneous laboratory X-ray absorption spectroscopy (XAS), UV–Vis spectroscopy, and mass spectrometry. XAS showed a progressive increase in Pt fluorescence for Pt deposited on TiO2 for over an hour, which is correlated with the signal of the produced H2. The final Pt/TiO2 catalyst contained Pt(0) particles. The electronic features corresponding to the Pt4+ species in the UV–Vis spectrum of the solution disappear as soon as UV radiation is applied in the presence of formic acid, which acts as a hole scavenger, resulting in the presence of Pt(0) particles in solution. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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