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151 results on '"Lanzafame, Paola"'

1. Catalysis for e-Chemistry: Need and Gaps for a Future De-Fossilized Chemical Production, with Focus on the Role of Complex (Direct) Syntheses by Electrocatalysis

Author

Papanikolaou, Georgia, Centi, Gabriele, Perathoner, Siglinda, and Lanzafame, Paola

Subjects
Physics - Chemical Physics, Condensed Matter - Materials Science
Abstract

The prospects, needs and limits in current approaches in catalysis to accelerate the transition to e-chemistry, where this term indicates a fossil fuel-free chemical production, are discussed. It is suggested that e-chemistry is a necessary element of the transformation to meet the targets of net zero emissions by year 2050 and that this conversion from the current petrochemistry is feasible. However, the acceleration of the development of catalytic technologies based on the use of renewable energy sources (indicated as reactive catalysis) is necessary, evidencing that these are part of a system of changes and thus should be assessed from this perspective. However, it is perceived that the current studies in the area are not properly addressing the needs to develop the catalytic technologies required for e-chemistry, presenting a series of relevant aspects and directions in which research should be focused to develop the framework system transformation necessary to implement e-chemistry.

Published
2022
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16. Surface modified Carbon Vulcan based electrodes for electrocatalytic reduction of CO2 to high value products

Author

Papanikolaou, Georgia, Chillè, Donatella, Lanzafame, Paola, Caccamo, Maria Teresa, and Magazù, Salvatore

Abstract

The electrocatalytic reduction of CO2 (CO2RR) in high value products represents a high potential strategy in addressing global climate change. Vulcan XC-72 carbon black is considered to be a promising catalyst support for metals nanoparticles in the CO2RR due to its good electrical properties, high mesoporous distribution and low cost. In this work we reported how the surface chemical modification of carbon Vulcan XC-72 leads to the introduction of oxygenated functionalities with a significant increase of the activity in the electrocatalytic reduction of CO2 to formic acid. The presence of oxygen-containing species results advantageous for the dispersion and anchoring of Sn nanoparticles onto carbon surface increasing the Faradaic selectivity to formic acid up to 80%.

Published
2022

17. Hydrophilic and Hydrophobic Effects on the Structure and Themodynamic Properties of Confined Water: Water in Solutions

Author

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Mallamace, Francesco, Mallamace, Domenico, Chen, Sow-Hsin, Lanzafame, Paola, Papanikolaou, Georgia, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Mallamace, Francesco, Mallamace, Domenico, Chen, Sow-Hsin, Lanzafame, Paola, and Papanikolaou, Georgia

Abstract

NMR spectroscopy is used in the temperature range 180–350 K to study the local order and transport properties of pure liquid water (bulk and confined) and its solutions with glycerol and methanol at different molar fractions. We focused our interest on the hydrophobic effects (HE), i.e., the competition between hydrophilic and hydrophobic interactions. Nowadays, compared to hydrophilicity, little is known about hydrophobicity. Therefore, the main purpose of this study is to gain new information about hydrophobicity. As the liquid water properties are dominated by polymorphism (two coexisting liquid phases of high and low density) due to hydrogen bond interactions (HB), creating (especially in the supercooled regime) the tetrahedral networking, we focused our interest to the HE of these structures. We measured the relaxation times (T1emantics> and T2emantics>) and the self-diffusion (DSemantics>). From these times, we took advantage of the NMR property to follow the behaviors of each molecular component (the hydrophilic and hydrophobic groups) separately. In contrast, DSemantics> is studied in terms of the Adam–Gibbs model by obtaining the configurational entropy (Sconfemantics>

Published
2022

19. Optimisation of the electrochemical conversion of CO2 into formate in a flow cell configuration using a bismuth-based electrocatalyst.

Author

Miola, Matteo, Chillé, Donatella, Papanikolaou, Georgia, Lanzafame, Paola, and Pescarmona, Paolo P.

Subjects
ELECTRIC batteries, ELECTROLYTIC reduction, POWER resources, PH effect, ENERGY consumption, DYE-sensitized solar cells, POLLUTANTS, IRON-based superconductors
Abstract

Highly selective and active electrocatalysts are essential for industrial application of the electrochemical conversion of CO2 into valuable products. The electrochemical cell configuration and the optimisation of its parameters are also of paramount importance to promote the conversion of CO2 and enhance the selectivity and stability of the electrocatalyst. Furthermore, the cell needs to be designed to enable the continuous conversion of CO2 in a flow cell configuration with optimal use of energy resources, to obtain a sustainable CO2-to-formate conversion process. In this work, we present an in-depth, systematic investigation of the crucial parameters for the optimum operation of a flow cell for the conversion of CO2 with a highly scalable Bi-based electrocatalyst at industrially-relevant current densities (j = 100 mA cm-2), achieving high Faradaic efficiency (FEformate > 70%) for a prolonged application time (t = 65 h). By studying and tuning the electrolyte and CO2 feed flow, the membrane configuration, the pH of the electrolyte and the effect of possible contaminants in the CO2 source, we were able to gain important insights into the large-scale application of the Bibased electrocatalyst for the electrochemical reduction of CO2 into formate. [ABSTRACT FROM AUTHOR]

Published
2023
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25. Synthesis, Characterization and Photocatalytic Behavior of SiO2@nitrized‐TiO2 Nanocomposites Obtained by a Straightforward Novel Approach

Author

Gulino, Antonino, primary, Papanikolaou, Georgia, additional, Lanzafame, Paola, additional, Aaliti, Abdellatif, additional, Primerano, Patrizia, additional, Spitaleri, Luca, additional, Triolo, Claudia, additional, Dahrouch, Zainab, additional, Khaskhoussi, Amani, additional, and Lo Schiavo, Sandra, additional

Published
2021
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26. The Hydrophilic and Hydrophobic Effects on the Structure and Thermodynamic Properties of Confined Water: Water in Solutions

Author

Mallamace, Francesco, Mallamace, Domenico, Chen, Sow Hsin, Lanzafame, Paola, and Papanikolau, Geaorgia

Subjects
analytical_chemistry
Abstract

NMR Spectroscopy is used, in the temperature range 180-350K, to study local order and transport in liquid water (pure and confined) and its solutions with glicerol and methanol at different molar fractions. Being the liquid water thermodynamic dominated by polymorphism (two coexisting liquid phases: high- and low-density HDL and LDL) - with the LDL due to the hydrophilic HB interactions, originating in the supercooled regime the tetrahedral networking and the liquid-liquid transition – we focused our interest to hydrophobic effects (HE) on these. Nowadays, if compared to the hydrophilicity, little is known about hydrophobicity so that the main purpose of this study is to gain new information on it. We measured the relaxation times (T1 and T2) and the self-diffusion (DS). From the times we took advantage of the NMR property to follow the behaviors of each molecular component (the hydrophilic and hydrophobic groups) separately; they are studied directly and DS in terms of the Adam-Gibbs model: obtaining the configurational entropy (Sconf ) and the specific heat contributions (CP,conf ). Due to the HE all the studied quantities, behave differently. For water-glycerol the HB interaction is dominant for all the conditions, whereas for water-methanol are observable two different T-regions above and below 265 K, dominated respectively by the hydrophilicity and hydrophobicity. A situation linked to the water polymorphism. Below this temperature, where the LDL phase and the HB networking develops and grows, the times and CP,conf change behaviors leading to maxima and minima. Above it, where the HB becomes weak and less stable and the HDL dominates, the hydrophobicity determines the solution properties.

Published
2021

29. Hydrophilic and Hydrophobic Effects on the Structure and Themodynamic Properties of Confined Water: Water in Solutions

Author

Mallamace, Francesco, Mallamace, Domenico, Chen, Sow-Hsin, Lanzafame, Paola, Papanikolaou, Georgia, Mallamace, Francesco, Mallamace, Domenico, Chen, Sow-Hsin, Lanzafame, Paola, and Papanikolaou, Georgia

Abstract

NMR spectroscopy is used in the temperature range 180–350 K to study the local order and transport properties of pure liquid water (bulk and confined) and its solutions with glycerol and methanol at different molar fractions. We focused our interest on the hydrophobic effects (HE), i.e., the competition between hydrophilic and hydrophobic interactions. Nowadays, compared to hydrophilicity, little is known about hydrophobicity. Therefore, the main purpose of this study is to gain new information about hydrophobicity. As the liquid water properties are dominated by polymorphism (two coexisting liquid phases of high and low density) due to hydrogen bond interactions (HB), creating (especially in the supercooled regime) the tetrahedral networking, we focused our interest to the HE of these structures. We measured the relaxation times (T1emantics> and T2emantics>) and the self-diffusion (DSemantics>). From these times, we took advantage of the NMR property to follow the behaviors of each molecular component (the hydrophilic and hydrophobic groups) separately. In contrast, DSemantics> is studied in terms of the Adam–Gibbs model by obtaining the configurational entropy (Sconfemantics>

Published
2021

31. Synthesis, Characterization and Photocatalytic Behavior of SiO2@nitrized‐TiO2 Nanocomposites Obtained by a Straightforward Novel Approach.

Author

Gulino, Antonino, Papanikolaou, Georgia, Lanzafame, Paola, Aaliti, Abdellatif, Primerano, Patrizia, Spitaleri, Luca, Triolo, Claudia, Dahrouch, Zainab, Khaskhoussi, Amani, and Lo Schiavo, Sandra

Subjects
RUTILE, METHYLENE blue, NANOCOMPOSITE materials, BASIC dyes, VISIBLE spectra, TITANIUM dioxide
Abstract

We report on the facile synthesis of SiO2@nitrized‐TiO2 nanocomposite (NST) by calcination of TiO2 xerogel with OctaAmmonium POSS® (N‐POSS; POSS=polyhedral oligomeric silsesquioxanes). The as‐obtained nanoporous mixed oxide is constituted by uniformly distributed SiO2 and nitrized‐TiO2, where the silica component is present in an amorphous state and TiO2 in an anatase/rutile mixed phase (92.1 % vs. 7.9 %, respectively) with very small anatase crystallites (3.7 nm). The TiO2 lattice is nitrized both at interstitial and substitutional positions. NST features a negatively charged surface with a remarkable surface area (406 m2 g−1), endowed with special adsorption capabilities towards cationic dyes. Its photocatalytic behavior was tested by following the degradation of standard aqueous methylene blue and methyl orange solutions under UV and visible light irradiation, according to ISO 10678:2010. For comparison, analogous investigations were carried out on a silica‐free N−TiO2, obtained by using NH4Cl as nitrogen source. [ABSTRACT FROM AUTHOR]

Published
2021
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