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The hydrogen economy relies on effective and environmentally friendly processes for energy conversion and storage. To this end, hydrogen is progressively holding the role of preferred energy vector. Within this frame, electrochemical science and technology is actively contributing in developing advanced fuel cells and water electrolyzers to be integrated in (i) energy parks to decouple production and consumption; (ii) exploit renewable sources; (iii) favour the progressive reduction of fossil fuels and reduce the greenhouse effect via decarbonization. The exploitation of the relevant processes and devices call for the sound control over the environmental impact from production to end-of-life steps. Here, life-cycle analyses were performed and discussed focusing on both acid and alkaline fuel cells, i.e., proton exchange membrane fuel cells (PEMFC) and anion-exchange membrane fuel cells (AEMFC), and assessing their contribution to key environmental impact categories such as, for example, global warming and ozone layer depletion. Within these premises, the study points to the benefits of replacing platinum by low load Pd/CeO2 bifunctional electrocatalyst on electrochemical hydrogen production and usage.
Simone Minelli; Michele Civelli; Sandra Rondinini; Alessandro Minguzzi; Alberto Vertova. AEMFC Exploiting a Pd/CeO2-Based Anode Compared to Classic PEMFC via LCA Analysis. Hydrogen 2021, 2, 246 -261.
AMA StyleSimone Minelli, Michele Civelli, Sandra Rondinini, Alessandro Minguzzi, Alberto Vertova. AEMFC Exploiting a Pd/CeO2-Based Anode Compared to Classic PEMFC via LCA Analysis. Hydrogen. 2021; 2 (3):246-261.
Chicago/Turabian StyleSimone Minelli; Michele Civelli; Sandra Rondinini; Alessandro Minguzzi; Alberto Vertova. 2021. "AEMFC Exploiting a Pd/CeO2-Based Anode Compared to Classic PEMFC via LCA Analysis." Hydrogen 2, no. 3: 246-261.
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.
Martina Fracchia; Paolo Ghigna; Marcello Marelli; Marco Scavini; Alberto Vertova; Sandra Rondinini; Roberto Della Pergola; Alessandro Minguzzi. Molecular cluster route for the facile synthesis of a stable and active Pt nanoparticle catalyst. New Journal of Chemistry 2021, 45, 11292 -11303.
AMA StyleMartina Fracchia, Paolo Ghigna, Marcello Marelli, Marco Scavini, Alberto Vertova, Sandra Rondinini, Roberto Della Pergola, Alessandro Minguzzi. Molecular cluster route for the facile synthesis of a stable and active Pt nanoparticle catalyst. New Journal of Chemistry. 2021; 45 (25):11292-11303.
Chicago/Turabian StyleMartina Fracchia; Paolo Ghigna; Marcello Marelli; Marco Scavini; Alberto Vertova; Sandra Rondinini; Roberto Della Pergola; Alessandro Minguzzi. 2021. "Molecular cluster route for the facile synthesis of a stable and active Pt nanoparticle catalyst." New Journal of Chemistry 45, no. 25: 11292-11303.
Chlorine dioxide (ClO2) has been widely used as a disinfectant in drinking water in the past but its effects on water pipes have not been investigated deeply, mainly due to the difficult experimental set-up required to simulate real-life water pipe conditions. In the present paper, four different kinds of water pipes, two based on plastics, namely random polypropylene (PPR) and polyethylene of raised temperature (PERT/aluminum multilayer), and two made of metals, i.e., copper and galvanized steel, were put in a semi-closed system where ClO2 was dosed continuously. The semi-closed system allowed for the simulation of real ClO2 concentrations in common water distribution systems and to simulate the presence of pipes made with different materials from the source of water to the tap. Results show that ClO2 has a deep effect on all the materials tested (plastics and metals) and that severe damage occurs due to its strong oxidizing power in terms of surface chemical modification of metals and progressive cracking of plastics. These phenomena could in turn become an issue for the health and safety of drinking water due to progressive leakage of degraded products in the water.
Alberto Vertova; Alessandro Miani; Giordano Lesma; Sandra Rondinini; Alessandro Minguzzi; Luigi Falciola; Marco Aldo Ortenzi. Chlorine Dioxide Degradation Issues on Metal and Plastic Water Pipes Tested in Parallel in a Semi-Closed System. International Journal of Environmental Research and Public Health 2019, 16, 4582 .
AMA StyleAlberto Vertova, Alessandro Miani, Giordano Lesma, Sandra Rondinini, Alessandro Minguzzi, Luigi Falciola, Marco Aldo Ortenzi. Chlorine Dioxide Degradation Issues on Metal and Plastic Water Pipes Tested in Parallel in a Semi-Closed System. International Journal of Environmental Research and Public Health. 2019; 16 (22):4582.
Chicago/Turabian StyleAlberto Vertova; Alessandro Miani; Giordano Lesma; Sandra Rondinini; Alessandro Minguzzi; Luigi Falciola; Marco Aldo Ortenzi. 2019. "Chlorine Dioxide Degradation Issues on Metal and Plastic Water Pipes Tested in Parallel in a Semi-Closed System." International Journal of Environmental Research and Public Health 16, no. 22: 4582.
Lorenzo Migliorini; Tommaso Santaniello; Sandra Rondinini; Paolo Saettone; Mauro Comes Franchini; Cristina Lenardi; Paolo Milani. Bioplastic electromechanical actuators based on biodegradable poly(3-hydroxybutyrate) and cluster-assembled gold electrodes. Sensors and Actuators B: Chemical 2019, 286, 230 -236.
AMA StyleLorenzo Migliorini, Tommaso Santaniello, Sandra Rondinini, Paolo Saettone, Mauro Comes Franchini, Cristina Lenardi, Paolo Milani. Bioplastic electromechanical actuators based on biodegradable poly(3-hydroxybutyrate) and cluster-assembled gold electrodes. Sensors and Actuators B: Chemical. 2019; 286 ():230-236.
Chicago/Turabian StyleLorenzo Migliorini; Tommaso Santaniello; Sandra Rondinini; Paolo Saettone; Mauro Comes Franchini; Cristina Lenardi; Paolo Milani. 2019. "Bioplastic electromechanical actuators based on biodegradable poly(3-hydroxybutyrate) and cluster-assembled gold electrodes." Sensors and Actuators B: Chemical 286, no. : 230-236.
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.
Martina Fracchia; Paolo Ghigna; Alberto Vertova; Sandra Rondinini; Alessandro Minguzzi. Time-Resolved X-ray Absorption Spectroscopy in (Photo)Electrochemistry. Surfaces 2018, 1, 138 -150.
AMA StyleMartina Fracchia, Paolo Ghigna, Alberto Vertova, Sandra Rondinini, Alessandro Minguzzi. Time-Resolved X-ray Absorption Spectroscopy in (Photo)Electrochemistry. Surfaces. 2018; 1 (1):138-150.
Chicago/Turabian StyleMartina Fracchia; Paolo Ghigna; Alberto Vertova; Sandra Rondinini; Alessandro Minguzzi. 2018. "Time-Resolved X-ray Absorption Spectroscopy in (Photo)Electrochemistry." Surfaces 1, no. 1: 138-150.
In this paper we propose titanium dioxide modified with cobalt(II) 2-ethylhexanoate ([email protected]) as photoactive material for the efficient visible light driven production of H2O2. We demonstrate that visible light activity can be achieved thanks to a photoinduced electron transfer from the excited complex towards the TiO2 conduction band that corresponds to a cobalt-to-titanium-charge-transfer transition. H2O2 is synthetized by a combination of oxygen reduction and water oxidation, that is possible thanks to the correct band position of [email protected] A mechanism of H2O2 formation is suggested on the basis of experimental evidences. Reactive oxygen intermediates, together with H2O2 are responsible for the photocatalytic degradation of a nonionic surfactant, of methylene blue and of phenol for wastewater treatments. Finally, and quite interestingly, [email protected] can be also used in a photoelectrochemical setup, where it can be adopted both as photoanode and photocatode, and the switching potential corresponds to the redox potential of the adsorbed complex Co(III)/Co(II) couple.
Tomasz Baran; Szymon Wojtyła; Alessandro Minguzzi; Sandra Rondinini; Alberto Vertova. Achieving efficient H2O2 production by a visible-light absorbing, highly stable photosensitized TiO2. Applied Catalysis B: Environmental 2018, 244, 303 -312.
AMA StyleTomasz Baran, Szymon Wojtyła, Alessandro Minguzzi, Sandra Rondinini, Alberto Vertova. Achieving efficient H2O2 production by a visible-light absorbing, highly stable photosensitized TiO2. Applied Catalysis B: Environmental. 2018; 244 ():303-312.
Chicago/Turabian StyleTomasz Baran; Szymon Wojtyła; Alessandro Minguzzi; Sandra Rondinini; Alberto Vertova. 2018. "Achieving efficient H2O2 production by a visible-light absorbing, highly stable photosensitized TiO2." Applied Catalysis B: Environmental 244, no. : 303-312.
We present the synthesis and the characterization of a novel cellulose-based electroactive hydrogel obtained through a simple water-based process. Its swelling and electroactive properties are here studied especially in low salinity water solutions. By combining smart materials and three-dimensional printing technique, we assessed that hydrogels can be shaped as natural algae and their motion can be controlled with electric signals to mimic natural seaweed movements under the effect of water flow. This could constitute a first step toward the development of hybrid habitats where artificial smart algae could cohabit with real living organisms or microorganisms.
Lorenzo Migliorini; Yunsong Yan; Federico Pezzotta; Francesca Maria Sole Veronesi; Cristina Lenardi; Sandra Rondinini; Tommaso Santaniello; Paolo Milani. Cellulose-based electroactive hydrogels for seaweed mimicking toward hybrid artificial habitats creation. MRS Communications 2018, 8, 1129 -1134.
AMA StyleLorenzo Migliorini, Yunsong Yan, Federico Pezzotta, Francesca Maria Sole Veronesi, Cristina Lenardi, Sandra Rondinini, Tommaso Santaniello, Paolo Milani. Cellulose-based electroactive hydrogels for seaweed mimicking toward hybrid artificial habitats creation. MRS Communications. 2018; 8 (3):1129-1134.
Chicago/Turabian StyleLorenzo Migliorini; Yunsong Yan; Federico Pezzotta; Francesca Maria Sole Veronesi; Cristina Lenardi; Sandra Rondinini; Tommaso Santaniello; Paolo Milani. 2018. "Cellulose-based electroactive hydrogels for seaweed mimicking toward hybrid artificial habitats creation." MRS Communications 8, no. 3: 1129-1134.
Tommaso Santaniello; Lorenzo Migliorini; Francesca Borghi; Yunsong Yan; Sandra Rondinini; Cristina Lenardi; Paolo Milani. Spring-like electroactive actuators based on paper/ionogel/metal nanocomposites. Smart Materials and Structures 2018, 27, 065004 .
AMA StyleTommaso Santaniello, Lorenzo Migliorini, Francesca Borghi, Yunsong Yan, Sandra Rondinini, Cristina Lenardi, Paolo Milani. Spring-like electroactive actuators based on paper/ionogel/metal nanocomposites. Smart Materials and Structures. 2018; 27 (6):065004.
Chicago/Turabian StyleTommaso Santaniello; Lorenzo Migliorini; Francesca Borghi; Yunsong Yan; Sandra Rondinini; Cristina Lenardi; Paolo Milani. 2018. "Spring-like electroactive actuators based on paper/ionogel/metal nanocomposites." Smart Materials and Structures 27, no. 6: 065004.
Martina Fracchia; Alberto Visibile; Elisabet Ahlberg; Alberto Vertova; Alessandro Minguzzi; Paolo Ghigna; Sandra Rondinini. α- and γ-FeOOH: Stability, Reversibility, and Nature of the Active Phase under Hydrogen Evolution. ACS Applied Energy Materials 2018, 1, 1716 -1725.
AMA StyleMartina Fracchia, Alberto Visibile, Elisabet Ahlberg, Alberto Vertova, Alessandro Minguzzi, Paolo Ghigna, Sandra Rondinini. α- and γ-FeOOH: Stability, Reversibility, and Nature of the Active Phase under Hydrogen Evolution. ACS Applied Energy Materials. 2018; 1 (4):1716-1725.
Chicago/Turabian StyleMartina Fracchia; Alberto Visibile; Elisabet Ahlberg; Alberto Vertova; Alessandro Minguzzi; Paolo Ghigna; Sandra Rondinini. 2018. "α- and γ-FeOOH: Stability, Reversibility, and Nature of the Active Phase under Hydrogen Evolution." ACS Applied Energy Materials 1, no. 4: 1716-1725.
Alessandro Minguzzi; Linda Montagna; Andrea Falqui; Alberto Vertova; Sandra Rondinini; Paolo Ghigna. Dynamics of oxide growth on Pt nanoparticles electrodes in the presence of competing halides by operando energy dispersive X-Ray absorption spectroscopy. Electrochimica Acta 2018, 270, 378 -386.
AMA StyleAlessandro Minguzzi, Linda Montagna, Andrea Falqui, Alberto Vertova, Sandra Rondinini, Paolo Ghigna. Dynamics of oxide growth on Pt nanoparticles electrodes in the presence of competing halides by operando energy dispersive X-Ray absorption spectroscopy. Electrochimica Acta. 2018; 270 ():378-386.
Chicago/Turabian StyleAlessandro Minguzzi; Linda Montagna; Andrea Falqui; Alberto Vertova; Sandra Rondinini; Paolo Ghigna. 2018. "Dynamics of oxide growth on Pt nanoparticles electrodes in the presence of competing halides by operando energy dispersive X-Ray absorption spectroscopy." Electrochimica Acta 270, no. : 378-386.
Here we report the synthesis of a core - CuI/shell - CuO nanostructure that depending on the applied potential works as photocathode or photoanode in neutral pH upon visible light irradiation. Under cathodic polarization, this material generates a stable photocurrent but functions as photoanode when anodic polarization is applied. In this new core-shell structure, the relevant position of the band edge potentials is pH–tunable and does not strictly follow the typical Nernstian dependence as by many semiconductor oxides, opening new directions in the nanoscale design of stable photoelectrodes for solar water splitting.
Tomasz Baran; Alberto Visibile; Szymon Wojtyła; Marcello Marelli; Stefano Checchia; Marco Scavini; Francesco Malara; Alberto Naldoni; Alberto Vertova; Sandra Rondinini; Alessandro Minguzzi. Reverse type I core - CuI /shell - CuO: A versatile heterostructure for photoelectrochemical applications. Electrochimica Acta 2018, 266, 441 -451.
AMA StyleTomasz Baran, Alberto Visibile, Szymon Wojtyła, Marcello Marelli, Stefano Checchia, Marco Scavini, Francesco Malara, Alberto Naldoni, Alberto Vertova, Sandra Rondinini, Alessandro Minguzzi. Reverse type I core - CuI /shell - CuO: A versatile heterostructure for photoelectrochemical applications. Electrochimica Acta. 2018; 266 ():441-451.
Chicago/Turabian StyleTomasz Baran; Alberto Visibile; Szymon Wojtyła; Marcello Marelli; Stefano Checchia; Marco Scavini; Francesco Malara; Alberto Naldoni; Alberto Vertova; Sandra Rondinini; Alessandro Minguzzi. 2018. "Reverse type I core - CuI /shell - CuO: A versatile heterostructure for photoelectrochemical applications." Electrochimica Acta 266, no. : 441-451.
Tomasz Baran; Szymon Wojtyła; Alberto Vertova; Alessandro Minguzzi; Sandra Rondinini. Photoelectrochemical and photocatalytic systems based on titanates for hydrogen peroxide formation. Journal of Electroanalytical Chemistry 2018, 808, 395 -402.
AMA StyleTomasz Baran, Szymon Wojtyła, Alberto Vertova, Alessandro Minguzzi, Sandra Rondinini. Photoelectrochemical and photocatalytic systems based on titanates for hydrogen peroxide formation. Journal of Electroanalytical Chemistry. 2018; 808 ():395-402.
Chicago/Turabian StyleTomasz Baran; Szymon Wojtyła; Alberto Vertova; Alessandro Minguzzi; Sandra Rondinini. 2018. "Photoelectrochemical and photocatalytic systems based on titanates for hydrogen peroxide formation." Journal of Electroanalytical Chemistry 808, no. : 395-402.
In the wide area of water treatments, direct electroreduction processes represent one of the most effective routes for the detoxification of organic halides and their possible conversion to value added compounds. Although direct electroreductions do not represent a general methodology for water and wastewater treatments, they do successfully apply to this specific class of substances, which include several priority pollutants. This chapter describes the potential utilization of direct electroreduction for the treatment of wastewater contaminated by various kinds of pollutants. In particular, this chapter discusses advantages and disadvantages of electrochemical reduction for removing pollutants.
Sandra Rondinini; Cristina Locatelli; Alessandro Minguzzi; Alberto Vertova. Electroreduction. Electrochemical Water and Wastewater Treatment 2018, 3 -28.
AMA StyleSandra Rondinini, Cristina Locatelli, Alessandro Minguzzi, Alberto Vertova. Electroreduction. Electrochemical Water and Wastewater Treatment. 2018; ():3-28.
Chicago/Turabian StyleSandra Rondinini; Cristina Locatelli; Alessandro Minguzzi; Alberto Vertova. 2018. "Electroreduction." Electrochemical Water and Wastewater Treatment , no. : 3-28.
Jonathan Albo; Manuel Alvarez-Guerra; Sidney Aquino Neto; Patricia Balderas-Hernández; Carlos E. Barrera-Díaz; Katlin I. Barrios Eguiluz; Bryan Bilyeu; Enric Brillas; Brian P. Chaplin; Simona Corgiolu; Adalgisa R. De Andrade; Achille De Battisti; Marilia M. De Salles Pupo; Antonio Dominguez-Ramos; Elisama V. Dos Santos; Carolina Espinoza-Cisternas; Eduardo Expósito; Ana S. Fajardo; Francisco Gallud; Vicente García-García; Karine Groenen Serrano; Raquel Ibañez; Jesus Iniesta; Angel Irabien; Cristina Locatelli; Florencio Lugo; Laura Mais; Carlos A. Martínez-Huitle; Michele Mascia; Yunny Meas; Alejandro Medel; Alessandro Minguzzi; Vicente Montiel; Inmaculada Ortiz; Nihal Oturan; Mehmet A. Oturan; Martin A. Pacheco-Álvarez; Simonetta Palmas; Marco Panizza; Juan M. Peralta-Hernández; Elisabetta Petrucci; Valéria Reginatto; Maria J. Rivero; Manuel Andrés Rodrigo; Oscar Rodríguez-Narváez; Sandra Rondinini; Cristina Sáez; Ricardo Salazar; Giancarlo R. Salazar Banda; Géssica De O. Santiago Santos; Onofrio Scialdone; Ignasi Sirés; Ane M. Urtiaga; Annalisa Vacca; David Valero; Vanessa M. Vasconcelos; Alberto Vertova; Shraddha Vijay. Contributors. Electrochemical Water and Wastewater Treatment 2018, 1 .
AMA StyleJonathan Albo, Manuel Alvarez-Guerra, Sidney Aquino Neto, Patricia Balderas-Hernández, Carlos E. Barrera-Díaz, Katlin I. Barrios Eguiluz, Bryan Bilyeu, Enric Brillas, Brian P. Chaplin, Simona Corgiolu, Adalgisa R. De Andrade, Achille De Battisti, Marilia M. De Salles Pupo, Antonio Dominguez-Ramos, Elisama V. Dos Santos, Carolina Espinoza-Cisternas, Eduardo Expósito, Ana S. Fajardo, Francisco Gallud, Vicente García-García, Karine Groenen Serrano, Raquel Ibañez, Jesus Iniesta, Angel Irabien, Cristina Locatelli, Florencio Lugo, Laura Mais, Carlos A. Martínez-Huitle, Michele Mascia, Yunny Meas, Alejandro Medel, Alessandro Minguzzi, Vicente Montiel, Inmaculada Ortiz, Nihal Oturan, Mehmet A. Oturan, Martin A. Pacheco-Álvarez, Simonetta Palmas, Marco Panizza, Juan M. Peralta-Hernández, Elisabetta Petrucci, Valéria Reginatto, Maria J. Rivero, Manuel Andrés Rodrigo, Oscar Rodríguez-Narváez, Sandra Rondinini, Cristina Sáez, Ricardo Salazar, Giancarlo R. Salazar Banda, Géssica De O. Santiago Santos, Onofrio Scialdone, Ignasi Sirés, Ane M. Urtiaga, Annalisa Vacca, David Valero, Vanessa M. Vasconcelos, Alberto Vertova, Shraddha Vijay. Contributors. Electrochemical Water and Wastewater Treatment. 2018; ():1.
Chicago/Turabian StyleJonathan Albo; Manuel Alvarez-Guerra; Sidney Aquino Neto; Patricia Balderas-Hernández; Carlos E. Barrera-Díaz; Katlin I. Barrios Eguiluz; Bryan Bilyeu; Enric Brillas; Brian P. Chaplin; Simona Corgiolu; Adalgisa R. De Andrade; Achille De Battisti; Marilia M. De Salles Pupo; Antonio Dominguez-Ramos; Elisama V. Dos Santos; Carolina Espinoza-Cisternas; Eduardo Expósito; Ana S. Fajardo; Francisco Gallud; Vicente García-García; Karine Groenen Serrano; Raquel Ibañez; Jesus Iniesta; Angel Irabien; Cristina Locatelli; Florencio Lugo; Laura Mais; Carlos A. Martínez-Huitle; Michele Mascia; Yunny Meas; Alejandro Medel; Alessandro Minguzzi; Vicente Montiel; Inmaculada Ortiz; Nihal Oturan; Mehmet A. Oturan; Martin A. Pacheco-Álvarez; Simonetta Palmas; Marco Panizza; Juan M. Peralta-Hernández; Elisabetta Petrucci; Valéria Reginatto; Maria J. Rivero; Manuel Andrés Rodrigo; Oscar Rodríguez-Narváez; Sandra Rondinini; Cristina Sáez; Ricardo Salazar; Giancarlo R. Salazar Banda; Géssica De O. Santiago Santos; Onofrio Scialdone; Ignasi Sirés; Ane M. Urtiaga; Annalisa Vacca; David Valero; Vanessa M. Vasconcelos; Alberto Vertova; Shraddha Vijay. 2018. "Contributors." Electrochemical Water and Wastewater Treatment , no. : 1.
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.
Elisabetta Achilli; Alberto Vertova; Alberto Visibile; Cristina Locatelli; Alessandro Minguzzi; Sandra Rondinini; Paolo Ghigna. Structure and Stability of a Copper(II) Lactate Complex in Alkaline Solution: a Case Study by Energy-Dispersive X-ray Absorption Spectroscopy. Inorganic Chemistry 2017, 56, 6982 -6989.
AMA StyleElisabetta Achilli, Alberto Vertova, Alberto Visibile, Cristina Locatelli, Alessandro Minguzzi, Sandra Rondinini, Paolo Ghigna. Structure and Stability of a Copper(II) Lactate Complex in Alkaline Solution: a Case Study by Energy-Dispersive X-ray Absorption Spectroscopy. Inorganic Chemistry. 2017; 56 (12):6982-6989.
Chicago/Turabian StyleElisabetta Achilli; Alberto Vertova; Alberto Visibile; Cristina Locatelli; Alessandro Minguzzi; Sandra Rondinini; Paolo Ghigna. 2017. "Structure and Stability of a Copper(II) Lactate Complex in Alkaline Solution: a Case Study by Energy-Dispersive X-ray Absorption Spectroscopy." Inorganic Chemistry 56, no. 12: 6982-6989.
Electrochemical devices for energy conversion and storage are central for a sustainable economy. The performance of electrodes is driven by charge transfer across different layer materials and an understanding of the mechanistics is pivotal to gain improved efficiency. Here, we directly observe the transfer of photogenerated charge carriers in a photoanode made of hematite (α-Fe2O3) and a hydrous iridium oxide (IrOx) overlayer, which plays a key role in photoelectrochemical water oxidation. Through the use of operando X-ray absorption spectroscopy (XAS), we probe the change in occupancy of the Ir 5d levels during optical band gap excitation of α-Fe2O3. At potentials where no photocurrent is observed, electrons flow from the α-Fe2O3 photoanode to the IrOx overlayer. In contrast, when the composite electrode produces a sustained photocurrent (i.e., 1.4 V vs. RHE), a significant transfer of holes from the illuminated α-Fe2O3 to the IrOx layer is clearly demonstrated. The analysis of the operando XAS spectra further suggests that oxygen evolution actually occurs both at the α-Fe2O3/electrolyte and α-Fe2O3/IrOx interfaces. These findings represent an important outcome for a better understanding of composite photoelectrodes and their use in photoelectrochemical systems, such as hydrogen generation or CO2 reduction from sunlight.
Alessandro Minguzzi; Alberto Naldoni; Ottavio Lugaresi; Elisabetta Achilli; Francesco D'Acapito; Francesco Malara; Cristina Locatelli; Alberto Vertova; Sandra Rondinini; Paolo Ghigna. Observation of charge transfer cascades in α-Fe2O3/IrOxphotoanodes by operando X-ray absorption spectroscopy. Physical Chemistry Chemical Physics 2017, 19, 5715 -5720.
AMA StyleAlessandro Minguzzi, Alberto Naldoni, Ottavio Lugaresi, Elisabetta Achilli, Francesco D'Acapito, Francesco Malara, Cristina Locatelli, Alberto Vertova, Sandra Rondinini, Paolo Ghigna. Observation of charge transfer cascades in α-Fe2O3/IrOxphotoanodes by operando X-ray absorption spectroscopy. Physical Chemistry Chemical Physics. 2017; 19 (8):5715-5720.
Chicago/Turabian StyleAlessandro Minguzzi; Alberto Naldoni; Ottavio Lugaresi; Elisabetta Achilli; Francesco D'Acapito; Francesco Malara; Cristina Locatelli; Alberto Vertova; Sandra Rondinini; Paolo Ghigna. 2017. "Observation of charge transfer cascades in α-Fe2O3/IrOxphotoanodes by operando X-ray absorption spectroscopy." Physical Chemistry Chemical Physics 19, no. 8: 5715-5720.
Sandra Rondinini; Alessandro Minguzzi; Elisabetta Achilli; Cristina Locatelli; Giovanni Agostini; Sakura Pascarelli; Giorgio Spinolo; Alberto Vertova; Paolo Ghigna. The dynamics of pseudocapacitive phenomena studied by Energy Dispersive X-Ray Absorption Spectroscopy on hydrous iridium oxide electrodes in alkaline media. Electrochimica Acta 2016, 212, 247 -253.
AMA StyleSandra Rondinini, Alessandro Minguzzi, Elisabetta Achilli, Cristina Locatelli, Giovanni Agostini, Sakura Pascarelli, Giorgio Spinolo, Alberto Vertova, Paolo Ghigna. The dynamics of pseudocapacitive phenomena studied by Energy Dispersive X-Ray Absorption Spectroscopy on hydrous iridium oxide electrodes in alkaline media. Electrochimica Acta. 2016; 212 ():247-253.
Chicago/Turabian StyleSandra Rondinini; Alessandro Minguzzi; Elisabetta Achilli; Cristina Locatelli; Giovanni Agostini; Sakura Pascarelli; Giorgio Spinolo; Alberto Vertova; Paolo Ghigna. 2016. "The dynamics of pseudocapacitive phenomena studied by Energy Dispersive X-Ray Absorption Spectroscopy on hydrous iridium oxide electrodes in alkaline media." Electrochimica Acta 212, no. : 247-253.
Nanostructured MnO2 has unique electrocatalytic properties towards the Oxygen Reduction Reaction (ORR, the main cathodic reaction in metal-air devices), representing an excellent alternative to the expensive platinum. Herein, we report the hydrothermal synthesis of bare and 5% Ti-doped α-MnO2 nanoparticles using two different oxidizing agents, namely ammonium persulfate for MH_N samples and potassium permanganate for MH_K ones. The physico-chemical characterizations show that oxidant cations induce different structural, morphological and surface properties of the final powders. Hence, correlations between the different α-MnO2 characteristics and their electrocatalytic performances towards the ORR are drawn, highlighting the diverse effect even on the kinetic point of view. The ORR activity in alkaline media is examined by means of Staircase – Linear Sweep Voltammetry (S-LSV), using Gas Diffusion Electrode (GDE) as the air-cathode. The presence of these nanoparticles in the GDEs leads to a significant shift of the ORR onset potential (∼100 mV) towards less cathodic values, underlining the electrocatalytic efficiency of all the nanopowders. Furthermore, high exchange current densities (j0) are determined for GDEs with Ti-doped MnO2, comparable to the well-performing Pd45Pt5Sn50, and making it a promising material for the ORR.
E. Pargoletti; G. Cappelletti; A. Minguzzi; S. Rondinini; M. Leoni; M. Marelli; A. Vertova. High-performance of bare and Ti-doped α-MnO2 nanoparticles in catalyzing the Oxygen Reduction Reaction. Journal of Power Sources 2016, 325, 116 -128.
AMA StyleE. Pargoletti, G. Cappelletti, A. Minguzzi, S. Rondinini, M. Leoni, M. Marelli, A. Vertova. High-performance of bare and Ti-doped α-MnO2 nanoparticles in catalyzing the Oxygen Reduction Reaction. Journal of Power Sources. 2016; 325 ():116-128.
Chicago/Turabian StyleE. Pargoletti; G. Cappelletti; A. Minguzzi; S. Rondinini; M. Leoni; M. Marelli; A. Vertova. 2016. "High-performance of bare and Ti-doped α-MnO2 nanoparticles in catalyzing the Oxygen Reduction Reaction." Journal of Power Sources 325, no. : 116-128.
Light-driven water splitting is one of the most promising approaches for using solar energy in light of more sustainable development. In this paper, a highly efficient p-type copper(II) oxide photocathode is studied. The material, prepared by thermal treatment of CuI nanoparticles, is initially partially reduced upon working conditions and soon reaches a stable form. Upon visible-light illumination, the material yields a photocurrent of 1.3 mA cm–2 at a potential of 0.2 V vs a reversible hydrogen electrode at mild pH under illumination by AM 1.5 G and retains 30% of its photoactivity after 6 h. This represents an unprecedented result for a nonprotected Cu oxide photocathode at neutral pH. The photocurrent efficiency as a function of the applied potential was determined using scanning electrochemical microscopy. The material was characterized in terms of photoelectrochemical features; X-ray photoelectron spectroscopy, X-ray absorption near-edge structure, fixed-energy X-ray absorption voltammetry, and extended X-ray absorption fine structure analyses were carried out on pristine and used samples, which were used to explain the photoelectrochemical behavior. The optical features of the oxide are evidenced by direct reflectance spectroscopy and fluorescence spectroscopy, and Mott–Schottky analysis at different pH values explains the exceptional activity at neutral pH.
Tomasz Baran; Szymon Wojtyła; Cristina Lenardi; Alberto Vertova; Paolo Ghigna; Elisabetta Achilli; Martina Fracchia; Sandra Rondinini; Alessandro Minguzzi. An Efficient CuxO Photocathode for Hydrogen Production at Neutral pH: New Insights from Combined Spectroscopy and Electrochemistry. ACS Applied Materials & Interfaces 2016, 8, 21250 -21260.
AMA StyleTomasz Baran, Szymon Wojtyła, Cristina Lenardi, Alberto Vertova, Paolo Ghigna, Elisabetta Achilli, Martina Fracchia, Sandra Rondinini, Alessandro Minguzzi. An Efficient CuxO Photocathode for Hydrogen Production at Neutral pH: New Insights from Combined Spectroscopy and Electrochemistry. ACS Applied Materials & Interfaces. 2016; 8 (33):21250-21260.
Chicago/Turabian StyleTomasz Baran; Szymon Wojtyła; Cristina Lenardi; Alberto Vertova; Paolo Ghigna; Elisabetta Achilli; Martina Fracchia; Sandra Rondinini; Alessandro Minguzzi. 2016. "An Efficient CuxO Photocathode for Hydrogen Production at Neutral pH: New Insights from Combined Spectroscopy and Electrochemistry." ACS Applied Materials & Interfaces 8, no. 33: 21250-21260.
Photoelectrocatalytic processes (e.g. water splitting) are particularly interesting as a method of solar to chemical energy conversion. The catalytic process is driven by transient changes in the semiconductor material’s properties, such as the metal oxidation state, the local reconstruction of catalytic sites or charge recombination processes. Here, we report a novel experimental technique for performing pump and probe time-resolved hard X-ray absorption spectroscopy in electrochemical conditions under UV–vis irradiation: pump and probe XAS enables the study of processes occurring in pico- to microseconds time scale by probing the local electronic properties of a selected atom. The described technique was developed using α-Fe2O3/IrOx as a model photoelectrode.
Tomasz Baran; Martina Fracchia; Alberto Vertova; Elisabetta Achilli; Alberto Naldoni; Francesco Malara; Giacomo Rossi; Sandra Rondinini; Paolo Ghigna; Alessandro Minguzzi; Francesco D’Acapito. Operando and Time-Resolved X-Ray Absorption Spectroscopy for the Study of Photoelectrode Architectures. Electrochimica Acta 2016, 207, 16 -21.
AMA StyleTomasz Baran, Martina Fracchia, Alberto Vertova, Elisabetta Achilli, Alberto Naldoni, Francesco Malara, Giacomo Rossi, Sandra Rondinini, Paolo Ghigna, Alessandro Minguzzi, Francesco D’Acapito. Operando and Time-Resolved X-Ray Absorption Spectroscopy for the Study of Photoelectrode Architectures. Electrochimica Acta. 2016; 207 ():16-21.
Chicago/Turabian StyleTomasz Baran; Martina Fracchia; Alberto Vertova; Elisabetta Achilli; Alberto Naldoni; Francesco Malara; Giacomo Rossi; Sandra Rondinini; Paolo Ghigna; Alessandro Minguzzi; Francesco D’Acapito. 2016. "Operando and Time-Resolved X-Ray Absorption Spectroscopy for the Study of Photoelectrode Architectures." Electrochimica Acta 207, no. : 16-21.