In situ photodeposition of ultra-small palladium particles on TiO2
Kozyr, Elizaveta (University of Torino. Department of Chemistry and Nis Centre)
Martí-Sánchez, Sara (Institut Català de Nanociència i Nanotecnologia)
Skorynina, A. (Laboratori de Llum del Sincrotró ALBA)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Escudero, Carlos (Laboratori de Llum del Sincrotró ALBA)
Mino, Lorenzo (University of Torino. Department of Chemistry and Nis Centre)
Bugaev, Aram (Paul Scherrer Institut (Suïssa))

Date:	2024
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 ∼1nm 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.
Grants:	European Commission 101058414 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00457 Agencia Estatal de Investigación CEX2021-001214-S
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Photocatalysis ; Pd/TiO2 ; Operando spectroscopy ; XANES
Published in:	Journal of Synchrotron Radiation, Vol. 31, Part 5 (September 2024) , p. 1071-1077, ISSN 1600-5775

DOI: 10.1107/S1600577524004788
PMID: 39007821

7 p, 1.1 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > The ALBA Synchrotron
Articles > Research articles
Articles > Published articles