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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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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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Fleischmann S, Mitchell JB, Wang R, Zhan C, Jiang DE, Presser V, Augustyn V. Pseudocapacitance: From Fundamental Understanding to High Power Energy Storage Materials. Chem Rev 2020; 120:6738-6782. [DOI: 10.1021/acs.chemrev.0c00170] [Citation(s) in RCA: 531] [Impact Index Per Article: 132.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Simon Fleischmann
- Department of Materials Science & Engineering, North Carolina State University, Raleigh, North Carolina 27606, United States
| | - James B. Mitchell
- Department of Materials Science & Engineering, North Carolina State University, Raleigh, North Carolina 27606, United States
| | - Ruocun Wang
- Department of Materials Science & Engineering, North Carolina State University, Raleigh, North Carolina 27606, United States
| | - Cheng Zhan
- Quantum Simulation Group, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - De-en Jiang
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Volker Presser
- INM - Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
- Saarland University, Campus D2 2, 66123 Saarbrücken, Germany
| | - Veronica Augustyn
- Department of Materials Science & Engineering, North Carolina State University, Raleigh, North Carolina 27606, United States
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In-situ Quantification of Nanoparticles Oxidation: A Fixed Energy X-ray Absorption Approach. Catalysts 2019. [DOI: 10.3390/catal9080659] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The oxidation of palladium nanoparticles causes the performance degradation of alkaline direct ethanol fuel cells. Quantifying this oxidation is a task of tremendous importance to design mitigation strategies that extend the service life of catalysts and devices. Here, we show that the Fixed Energy X-ray Absorption Voltammetry (FEXRAV) can provide this information with an in-situ approach. To do so, we have developed a quantification method that assumes the linear response at fixed energy. With this method, we have investigated the oxidation of carbon black-supported palladium electrocatalysts during cyclic voltammetry in the same solution employed as a fuel in the direct ethanol fuel cells. We have shown that up to 38% of the palladium is oxidised at 1.2 V vs RHE and that such oxidation also happens at lower potentials that the catalyst can experience in real direct ethanol fuel cells. The result of this study is a proof of concept of quantitative FEXRAV.
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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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Minguzzi A, Montagna L, Falqui A, Vertova A, Rondinini S, Ghigna P. Dynamics of oxide growth on Pt nanoparticles electrodes in the presence of competing halides by operando energy dispersive X-Ray absorption spectroscopy. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.03.092] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Achilli E, Vertova A, Visibile A, Locatelli C, Minguzzi A, Rondinini S, Ghigna P. Structure and Stability of a Copper(II) Lactate Complex in Alkaline Solution: a Case Study by Energy-Dispersive X-ray Absorption Spectroscopy. Inorg Chem 2017; 56:6982-6989. [PMID: 28558207 DOI: 10.1021/acs.inorgchem.7b00553] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Energy-dispersive X-ray absorption spectroscopy was applied, aimed at solving the problem of the structure and stability of a copper(II) lactate complex in alkaline solution, used as a precursor for the electrodeposition of Cu2O. The application of multiple scattering calculations to the simulation of the X-ray absorption near-edge structure part of the spectra allowed an accurate resolution of the structure: the copper(II) cation is surrounded by four lactate ions in a distorted tetrahedral environment, with the lactate anions acting as monodentate ligands. This results in an atomic arrangement where copper is surrounded by four oxygen atoms located at quite a short distance (ca. 1.87 Å) and four oxygen atoms located quite far apart (ca. 3.1-3.2 Å). The complex was finally found to be stable in a wide range of applied potentials.
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Affiliation(s)
- Elisabetta Achilli
- Dipartimento di Chimica, Università degli Studi di Pavia and Unita di Ricerca INSTM di Pavia , Viale Taramelli 16, 27100, Pavia, Italy
| | - Alberto Vertova
- Dipartimento di Chimica, Università degli Studi di Milano and Unita di Ricerca INSTM di Milano , Via Golgi 19, 20133, Milan, Italy
| | - Alberto Visibile
- Dipartimento di Chimica, Università degli Studi di Milano and Unita di Ricerca INSTM di Milano , Via Golgi 19, 20133, Milan, Italy
| | - Cristina Locatelli
- Dipartimento di Chimica, Università degli Studi di Milano and Unita di Ricerca INSTM di Milano , Via Golgi 19, 20133, Milan, Italy
| | - Alessandro Minguzzi
- Dipartimento di Chimica, Università degli Studi di Milano and Unita di Ricerca INSTM di Milano , Via Golgi 19, 20133, Milan, Italy
| | - Sandra Rondinini
- Dipartimento di Chimica, Università degli Studi di Milano and Unita di Ricerca INSTM di Milano , Via Golgi 19, 20133, Milan, Italy
| | - Paolo Ghigna
- Dipartimento di Chimica, Università degli Studi di Pavia and Unita di Ricerca INSTM di Pavia , Viale Taramelli 16, 27100, Pavia, Italy
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