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In situ photodeposition of ultra-small palladium particles on TiO2.

ABSTRACT: In situ and operando investigation of photocatalysts plays a fundamental role in understanding the processes of active phase formation and the mechanisms of catalytic reactions, which is crucial for the rational design of more efficient materials. Using a custom-made operando photocatalytic cell, an in situ procedure to follow the formation steps of Pd/TiO2 photocatalyst by synchrotron-based X-ray absorption spectroscopy (XAS) is proposed. The procedure resulted in the formation of ∼1 nm Pd particles with a much narrower size distribution and homogeneous spreading over TiO2 support compared with the samples generated in a conventional batch reactor. The combination of in situ XAS spectroscopy with high-angle annular dark-field scanning transmission electron microscopy demonstrated the formation of single-atom Pd(0) sites on TiO2 as the initial step of the photodeposition process. Palladium hydride particles were observed for all investigated samples upon exposure to formic acid solutions.

SUBMITTER: Kozyr E 

PROVIDER: S-EPMC11371036 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature

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In situ photodeposition of ultra-small palladium particles on TiO<sub>2</sub>.

Kozyr Elizaveta E   Martí-Sánchez Sara S   Skorynina Alina A   Arbiol Jordi J   Escudero Carlos C   Mino Lorenzo L   Bugaev Aram A  

Journal of synchrotron radiation 20240715 Pt 5

In situ and operando investigation of photocatalysts plays a fundamental role in understanding the processes of active phase formation and the mechanisms of catalytic reactions, which is crucial for the rational design of more efficient materials. Using a custom-made operando photocatalytic cell, an in situ procedure to follow the formation steps of Pd/TiO<sub>2</sub> photocatalyst by synchrotron-based X-ray absorption spectroscopy (XAS) is proposed. The procedure resulted in the formation of ∼1  ...[more]

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