Operando Laboratory X-ray Absorption Spectroscopy and UV–Vis Study of Pt/TiO2 Photocatalysts during Photodeposition and Hydrogen Evolution Reactions

Kozyr, Elizaveta G.; Njoroge, Peter N.; Chapek, Sergei V.; Шаповалов, В. В.; Skorynina, Alina A.; Pnevskaya, Anna Yu.; Bulgakov, A. N.; Солдатов, А. В.; Pellegrino, Francesco; Groppo, Elena; Bordiga, Silvia; Mino, Lorenzo; Bugaev, Aram L.

doi:10.3390/catal13020414

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…In this sample, a strong absorption peak at 330 nm was observed, arising from the π → π* transition of the azobenzene unit . After the introduction of one equivalent of Pt 4+ to the peptide (blue spectrum), a new peak of 262 nm was observed, which correlated to the Pt–Cl ligand to the metal charge transfer band (LMCT) . It is interesting to note that no specific LMCT arising from the complexation of the Pt 4+ to the peptide was observed prior to reduction.…”

Section: Results and Discussionmentioning

confidence: 88%

“…44 After the introduction of one equivalent of Pt 4+ to the peptide (blue spectrum), a new peak of 262 nm was observed, which correlated to the Pt−Cl ligand to the metal charge transfer band (LMCT). 46 It is interesting to note that no specific LMCT arising from the complexation of the Pt 4+ to the peptide was observed prior to reduction. The system was subsequently reduced with NaBH 4 and spectroscopically analyzed 1 h postreduction (orange spectrum).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Substrate Effects on Remote Optical Control of Pt Nanoparticle-Driven Olefin Hydrogenation

Xie,

Slocik,

Dennis

et al. 2024

ACS Appl. Nano Mater.

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Bioinspired approaches for materials synthesis and application are emerging as potentially sustainable approaches to achieve functional structures with selectively controlled properties (e.g., turn-on catalysis). An attractive avenue to allow for selective functionality is optical stimulation; however, the ability to make nanomaterials light responsive for many applications remains challenging. One approach is to incorporate photoswitches into the surface-adsorbed ligands which can stimulate a surface structural change that could have implications on the catalytic reactivity driven by the underlying metallic nanoparticle component. Herein we demonstrate the ability to drive optical switching of surface ligand overlayer structures on peptide-capped Pt nanoparticles. To this end, incorporation of an azobenzene unit into the surfaceadsorbed peptide allows for the ability to optically reconfigure the ligand overlayer structure. This change results in direct manipulation of the catalytic properties of the Pt materials for olefin hydrogenation, which demonstrated changes in reactivity not only between different reagents but also between the different ligand structures. Such results present information that could be used in the design of ligand interface structures to trigger specific reactivity control for a variety of reactions and materials for sustainable catalysis.

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Section: Results and Discussionmentioning

confidence: 88%

Section: ■ Results and Discussionmentioning

confidence: 99%

Substrate Effects on Remote Optical Control of Pt Nanoparticle-Driven Olefin Hydrogenation

Xie,

Slocik,

Dennis

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

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Synchrotron Radiation Based X‐ray Absorption Spectroscopy: Fundamentals and Applications in Photocatalysis

Cai,

Sun,

Bao

2024

ChemPhysChem

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Photocatalysis is one of the most promising green technologies to utilize solar energy for clean energy achievement and environmental governance. There is a knotty problem to rational designing high‐performance photocatalysts, which largely depends on an in‐depth insight into their structure‐activity relationships and complex photocatalytic reaction mechanisms. Synchrotron radiation based X‐ray absorption spectroscopy (XAS) is an important characterization method for photocatlaysts to offer the element‐specific key geometric and electronic structural information at the atomic level, on this basis, time‐resolved XAS technique has a huge impact on mechanistic understanding of photochemical reaction owing to their powerful ability to probe, in real‐time, the electronic and geometric structures evolution within photocatalysis reactions. This review will focus on the fundamentals of XAS and their applications in photocatalysis. The detailed applications obtained from XAS is described through the following aspects: 1) identifying local structure of photocatalyst; 2) uncovering in situ structure and chemical state evolution during photocatalysis; 3) revealing the photoexited process. We will provide an in depth understanding on how the XAS method can guide the rational design of highly efficient photocatalysts. Finally, a systematic summary of XAS and related significance is made and the research perspectives are suggested.

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3D Printed Microfluidic Cell for SAXS Time-Resolved Measurements of the Structure of Protein Crystallization Solutions

et al. 2023

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A multichannel microfluidic cell (MFC) obtained using 3D printing for studying the structure of complex solutions by small-angle X-ray scattering (SAXS) is described. MFC was tested at the BioMUR beamline of the Kurchatov synchrotron. A comparative analysis of SAXS signal from the standard capillary and from the developed MFC was carried out, with MFC showing significant advantages. The dynamics of SAXS scattering curves for lysozyme solutions with NaCl precipitant were studied when the protein and precipitant concentrations changed. The obtained time series of data are well consistent with the known data for the lysozyme solution.

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Operando Laboratory X-ray Absorption Spectroscopy and UV–Vis Study of Pt/TiO2 Photocatalysts during Photodeposition and Hydrogen Evolution Reactions

Cited by 3 publications

References 38 publications

Substrate Effects on Remote Optical Control of Pt Nanoparticle-Driven Olefin Hydrogenation

Substrate Effects on Remote Optical Control of Pt Nanoparticle-Driven Olefin Hydrogenation

Synchrotron Radiation Based X‐ray Absorption Spectroscopy: Fundamentals and Applications in Photocatalysis

3D Printed Microfluidic Cell for SAXS Time-Resolved Measurements of the Structure of Protein Crystallization Solutions

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