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- Title
Operando Laboratory X-ray Absorption Spectroscopy and UV–Vis Study of Pt/TiO 2 Photocatalysts during Photodeposition and Hydrogen Evolution Reactions.
- Authors
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.
- Abstract
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.
- Subjects
X-ray spectroscopy; ULTRAVIOLET-visible spectroscopy; X-ray absorption; TITANIUM dioxide; PHOTOCATALYSTS; IRRADIATION; HYDROGEN evolution reactions
- Publication
Catalysts (2073-4344), 2023, Vol 13, Issue 2, p414
- ISSN
2073-4344
- Publication type
Article
- DOI
10.3390/catal13020414