1
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Achilli E, Minelli S, Casale I, He X, Agostini G, Spinolo G, Ghigna P, Minguzzi A, Vertova A. Determining the Proton Diffusion Coefficient in Highly Hydrated Iridium Oxide Films by Energy Dispersive X-ray Absorption Spectroscopy. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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2
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Fracchia M, Ghigna P, Marelli M, Scavini M, Vertova A, Rondinini S, Della Pergola R, Minguzzi A. Molecular cluster route for the facile synthesis of a stable and active Pt nanoparticle catalyst. NEW J CHEM 2021. [DOI: 10.1039/d1nj00937k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular platinum clusters can be used for the synthesis of very small (ca. 1.5 nm) Pt nanoparticles with enhanced catalytic activity and stability towards the oxygen reduction reaction. The Pt–C interactions were characterized by TEM and EXAFS.
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Affiliation(s)
- Martina Fracchia
- Dipartimento di Chimica
- Università degli Studi di Pavia
- 27100 Pavia
- Italy
| | - Paolo Ghigna
- Dipartimento di Chimica
- Università degli Studi di Pavia
- 27100 Pavia
- Italy
- INSTM Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali
| | - Marcello Marelli
- CNR-SCITEC Istituto di Scienze e Tecnologie Chimiche “G. Natta”
- 20138 Milano
- Italy
| | - Marco Scavini
- INSTM Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali
- 50121 Firenze
- Italy
- Dipartimento di Chimica
- Università degli Studi di Milano
| | - Alberto Vertova
- INSTM Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali
- 50121 Firenze
- Italy
- Dipartimento di Chimica
- Università degli Studi di Milano
| | - Sandra Rondinini
- INSTM Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali
- 50121 Firenze
- Italy
- Dipartimento di Chimica
- Università degli Studi di Milano
| | - Roberto Della Pergola
- Dipartimento di Scienze dell’Ambiente e della Terra
- Università di Milano-Bicocca
- 20126 Milano
- Italy
| | - Alessandro Minguzzi
- INSTM Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali
- 50121 Firenze
- Italy
- Dipartimento di Chimica
- Università degli Studi di Milano
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3
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Malara F, Fracchia M, Kmentová H, Psaro R, Vertova A, Oliveira de Souza D, Aquilanti G, Olivi L, Ghigna P, Minguzzi A, Naldoni A. Direct Observation of Photoinduced Higher Oxidation States at a Semiconductor/Electrocatalyst Junction. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02789] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Francesco Malara
- CNR-Istituto di Scienze e Tecnologie Molecolari, Via Golgi 19, 20133 Milan, Italy
| | - Martina Fracchia
- Dipartimento di Chimica, Università di Pavia, V.le Taramelli 13, I-27100 Pavia, Italy
| | - Hana Kmentová
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, 78371 Olomouc, Czech Republic
| | - Rinaldo Psaro
- CNR-Istituto di Scienze e Tecnologie Molecolari, Via Golgi 19, 20133 Milan, Italy
| | - Alberto Vertova
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, I-20133 Milano, Italy
| | | | - Giuliana Aquilanti
- Elettra-Sincrotrone Trieste, Strada Statale 14 - km 163.5, 34149 Basovizza, Trieste, Italy
| | - Luca Olivi
- Elettra-Sincrotrone Trieste, Strada Statale 14 - km 163.5, 34149 Basovizza, Trieste, Italy
| | - Paolo Ghigna
- Dipartimento di Chimica, Università di Pavia, V.le Taramelli 13, I-27100 Pavia, Italy
- INSTM, Via G. Giusti 9, I-50121 Firenze, Italy
| | - Alessandro Minguzzi
- INSTM, Via G. Giusti 9, I-50121 Firenze, Italy
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, I-20133 Milano, Italy
| | - Alberto Naldoni
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, 78371 Olomouc, Czech Republic
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4
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Visibile A, Baran T, Rondinini S, Minguzzi A, Vertova A. Determining the Efficiency of Photoelectrode Materials by Coupling Cavity‐Microelectrode Tips and Scanning Electrochemical Microscopy. ChemElectroChem 2020. [DOI: 10.1002/celc.202000432] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Alberto Visibile
- Laboratory of Applied ElectrochemistryDipartimento di ChimicaUniversità degli Studi di Milano Via Golgi 19 20133 Milan Italy
| | - Tomasz Baran
- SajTom Light Future Wężerów 37 32-090 Wężerów Poland
| | - Sandra Rondinini
- Laboratory of Applied ElectrochemistryDipartimento di ChimicaUniversità degli Studi di Milano Via Golgi 19 20133 Milan Italy
- Istituto Nazionale di Scienza e Tecnologia dei Materiali Via Giusti 9 50121 Florence Italy
| | - Alessandro Minguzzi
- Laboratory of Applied ElectrochemistryDipartimento di ChimicaUniversità degli Studi di Milano Via Golgi 19 20133 Milan Italy
- Istituto Nazionale di Scienza e Tecnologia dei Materiali Via Giusti 9 50121 Florence Italy
| | - Alberto Vertova
- Laboratory of Applied ElectrochemistryDipartimento di ChimicaUniversità degli Studi di Milano Via Golgi 19 20133 Milan Italy
- Istituto Nazionale di Scienza e Tecnologia dei Materiali Via Giusti 9 50121 Florence Italy
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Mom R, Frevel L, Velasco-Vélez JJ, Plodinec M, Knop-Gericke A, Schlögl R. The Oxidation of Platinum under Wet Conditions Observed by Electrochemical X-ray Photoelectron Spectroscopy. J Am Chem Soc 2019; 141:6537-6544. [PMID: 30929429 PMCID: PMC6727372 DOI: 10.1021/jacs.8b12284] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
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During
the electrochemical reduction of oxygen, platinum catalysts
are often (partially) oxidized. While these platinum oxides are thought
to play a crucial role in fuel cell degradation, their nature remains
unclear. Here, we studied the electrochemical oxidation of Pt nanoparticles
using in situ XPS. When the particles were sandwiched between a graphene
sheet and a proton exchange membrane that is wetted from the back,
a confined electrolyte layer was formed, allowing us to probe the
electrocatalyst under wet conditions. We show that the surface oxide
formed at the onset of Pt oxidation has a mixed Ptδ+/Pt2+/Pt4+ composition. The formation of this
surface oxide is suppressed when a Br-containing membrane is chosen
due to adsorption of Br on Pt. Time-resolved measurements show that
oxidation is fast for nanoparticles: even bulk PtO2·nH2O growth occurs on the subminute time scale.
The fast formation of Pt4+ species in both surface and
bulk oxide form suggests that Pt4+-oxides are likely formed
(or reduced) even in the transient processes that dominate Pt electrode
degradation.
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Affiliation(s)
- Rik Mom
- Fritz-Haber-Institut der Max-Planck-Gesellschaft , Faradayweg 4-6 , 14195 Berlin , Germany
| | - Lorenz Frevel
- Fritz-Haber-Institut der Max-Planck-Gesellschaft , Faradayweg 4-6 , 14195 Berlin , Germany
| | | | - Milivoj Plodinec
- Fritz-Haber-Institut der Max-Planck-Gesellschaft , Faradayweg 4-6 , 14195 Berlin , Germany.,Rudjer Boskovic Institute , Bijenicka 54 , 10000 Zagreb , Croatia
| | - Axel Knop-Gericke
- Fritz-Haber-Institut der Max-Planck-Gesellschaft , Faradayweg 4-6 , 14195 Berlin , Germany
| | - Robert Schlögl
- Fritz-Haber-Institut der Max-Planck-Gesellschaft , Faradayweg 4-6 , 14195 Berlin , Germany
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Abstract
This minireview aims at providing a complete survey concerning the use of X-ray absorption spectroscopy (XAS) for time-resolved studies of electrochemical and photoelectrochemical phenomena. We will see that time resolution can range from the femto-picosecond to the second (or more) scale and that this joins the valuable throughput typical of XAS, which allows for determining the oxidation state of the investigated element, together with its local structure. We will analyze four different techniques that use different approaches to exploit the in real time capabilities of XAS. These are quick-XAS, energy dispersive XAS, pump & probe XAS and fixed-energy X-ray absorption voltammetry. In the conclusions, we will analyze possible future perspectives for these techniques.
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