Category: Patrizia bocchetta

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patrizia bocchetta

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Mn-Catalyzed Electrochemical Chloroalkylation of Alkenes. ACS Catalysis9 1 Rathnayake, Hector W.

patrizia bocchetta

Fraser, Euan K. Brechin, Scott J. Dalgarno, Jakob E. Baumeister, Pokpong Rungthanaphatsophon, Justin R. Walensky, Charles L. Barnes, Jerry L.Eco Salento S. DOI : Large surface areas with three-dimensional architectures, such as nanotubes, are encouraged because the easy access of ion, gas, liquid and radiation assures high ion exchange capacity, sensing and catalytic activities.

Keywords: Nanotubes, template, electrodeposition, iron oxyhydr oxide, metal oxide, anodic alumina.

Characterization of the particulate anode of a laboratory flow Zn–air fuel cell

Journal Name: Current Nanoscience. Volume 15Issue 6 Journal Home. Objective: In this work, the morphological evolution of Fe-oxyhydroxide electrodeposition inside AAM pores has been followed for the first time by selecting two relevant electrochemical conditions of synthesis producing high quality morphologies of nanotubes.

Methods: Iron oxyhydr oxide nanotubes have been synthesized by cathodic electrodeposition at a constant current in classic three-electrode cell. The morphological evolution of the growing nanostructure to nanotubes inside AAM in the two baths agrees very well with the overpotential vs.

The detailed SEM results collected in this work allowed to recommend template electrogeneration of base in ethanol solution containing Fe III chloride as a relevant procedure to obtain high-quality, compact and well-ordered Fe oxy-hydroxide nanotubes. Murphy, C. Anisotropic metal nanoparticles: Synthesis, assembly and optical applications. B, Zhou, K. Enhanced catalytic activity of ceria nanorods from well-defined reactive crystal planes.

Qin, G.

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A facile and template-free method to prepare mesoporous gold sponge and its pore size control. C, Sun, L. Tuning the properties of magnetic nanowires. IBM J. Das, D. An elegant method for large scale synthesis of metal oxide—carbon nanotube nanohybrids for nano-environmental application and implication studies. Nano, 4Kind code of ref document : A1. Effective date : Kind code of ref document : B1.

Ref country code : GB. Ref legal event code : FG4D. Ref document number : Country of ref document : DE. Date of ref document : Kind code of ref document : P. Ref country code : IT. Payment date : Year of fee payment : Ref country code : DE. Ref country code : FR. Ref legal event code : ST. Process for manufacturing a porous body, in particular suitable as a membrane, e. To provide membranes with higher inertia, the process comprises the following steps:. The invention relates to a process for manufacturing a porous body, in particular suitable as a membrane, e.

Chemical processes that use permeable membranes have become more and more important at industrial level during operations concerning the separation and purification of chemical mixtures. These processes, which are more and more widespread operations in various industrial processes, are dialysis, reverse osmosis, electro dialysis, gas separation, for example.

The choice of the material forming the membrane is of particular importance in these sectors because it must provide suitable requirements as for porosity, number of holes, diameters, etc. Most of the membranes use mainly synthetic material formed by polysulphonates and polyamide.

However, these membranes are not inert enough for many applications. Accordingly, it is an object of the present invention, to provide membranes with higher inertia and usable in a wider range of temperature. This object is solved by a process as initially mentioned performing mainly the following steps:. This process offers the possibility of producing an alumina membrane in an electrochemical way. Alumina is a ceramic oxide with excellent inert properties which is also resistant to high temperatures.

It is formed by a regularity of hexagonal cells with a cylindrical hole in the middle. The uniform distribution of pore diameters and their periodicity give an excellent membrane model. Their manufacture does not imply the use of dangerous expensive substances and the production technique is an electrochemical process of anodic oxidation on specific operation conditions.

As to polymeric membranes, alumina presents many technical and commercial advantages, such as:. According to an advantageous embodiment of the process of the present invention, the substrate too is made of aluminum.A complete description of the architecture of the adopted cell is reported.

The electrochemical characterization of the ZAFC was performed by long-term current discharge tests in galvanostatic mode. An insightful investigation on the particulate Zn anode consisting of spheres of diameter 0.

Electrochemical impedance spectroscopy EIS allowed to obtain information on the charge-transfer mechanism of zinc anode reaction and on the thickness, compactness, and blocking features of the passive film as a function of the aging of the electrolyte. The results of our analysis revealed the formation of a passive layer of zinc consisting of a white and porous film of ZnO precipitate type I and a light-gray to black compact film type II.

The failure of the particulate anode was chiefly caused by the increase in zincate concentration in the electrolyte, but it was enhanced by the nonuniform spatial current distribution due to the instability of the passive film at high pH. This is a preview of subscription content, log in to check access.

Rent this article via DeepDyve. J Power Sources — Smedley S Zinc air fuel cell for industrial and specialty vehicles. Springer, Berlin, p Google Scholar. Sapkota P, Kim H Zinc—air fuel cell, a potential candidate for alternative energy. J Ind Eng Chem — Cooper JF Continuos-feed electrochemical cell with nonpacking particulate electrode.

US Patent 5, J Appl Electrochem — Sapkota P, Kim H An experimental study on the performance of a zinc air fuel cell with inexpensive metal oxide catalysts and porous organic polymer separators. Abrams A Mud design to minimize rock impairment due to particle invasion. J Petrol Technol — Cooper JF, Krueger R The refuelable zinc—air battery: alternative techniques for zinc and electrolyte regeneration.

Zhang XG Novel anode for high power zinc—air batteries. ECS Trans —Either your web browser doesn't support Javascript or it is currently turned off. In the latter case, please turn on Javascript support in your web browser and reload this page. Polymers06 Jan9 1 DOI: Understanding the lateral variations in the elemental and chemical state of constituents induced by electrochemical reactions at nanoscales is crucial for the advancement of electrochemical materials science.

This requires in situ studies to provide observables that contribute to both modeling beyond the phenomenological level and exactly transducing the functionally relevant quantities. A range of X-ray coherent diffraction imaging CDI approaches have recently been proposed for imaging beyond the diffraction limit with potentially dramatic improvements in time resolution with chemical sensitivity. In this paper, we report a selection of ptychography results obtained in situ during the electrodeposition of a metal—polymer nanocomposite.

Our selection includes dynamic imaging during electrochemically driven growth complemented with absorption and phase spectroscopy with high lateral resolution. We demonstrate the onset of morphological instability feature formation and correlate the chemical state of Mn with the local growth rate controlled by the current density distribution resulting from morphological evolution.

Unfortunately, the ORR electrocatalytic activity of MnO x is generally inferior to that of platinum-based electrocatalysts: it exhibits higher overpotentials and it cannot follow the optimal four-electron pathway [ 910 ]; moreover, its electrochemical stability is not satisfactory.

In particular, Co, Ni and Mg-doping of MnO x catalysts has been also reported to increase the durability of electrodes subjected to accelerated ORR ageing [ 10151920212223 ]. Notwithstanding their electrocatalytic appeal, the practical application of Mn-Co oxides is impaired by their poor electrical conductivity: nevertheless, high-conductivity materials can be fabricated by composite synthesis routes, e.

The use of PPy for the fabrication of composite ORR electrocatalysts is attractive for the following reasons: i it is an excellent support for catalysts both in the form of metal oxides [ 24 ] and metallorganic complexes [ 2526 ]; ii if appropriately treated, it can act as a source of nitrogen, which is believed to enhance the electrocatalytic activity by forming Mn- or Co-N centers; iii it exhibits a good electronic conductivity in the doped form; iv it is easy to synthesise by chemical [ 27 ] or electrochemical [ 28 ] routes.

Cong at al. These workers incorporated the oxide particles—that had been pre-synthesised by thermal decomposition—into electrodeposited PPy. An alternative approach to the incorporation of pre-synthesised particles into electrodeposited PPy is to form both the oxide and the conducting polymer by a fully electrochemical route.

The present section describes the chemicals and equipment employed in the electrochemical fabrication protocols and electroanalytical measurements. The small amount of water increases the electropolymerisation rate and improves the mechanical properties, the adhesion and the conductivity of the polymer matrix [ 3337 ].

The liquid junction potential between aqueous and non-aqueous solution has been found to be negligible. N 2 Rivoira, 5 N was bubbled for 20 min into the solution before the measurement and an N 2 blanket was kept above the solution during electrochemistry. The WEs were polished mechanically to a mirror finish before each experiment and subsequently subjected to ultra-sonication in distilled water for 10 min and electrochemical oxidation of impurities in 0.

The counter electrode was cleaned by immersion in concentrated HNO 3 to remove metal impurities and by annealing in a butane flame to eliminate organic residues. The potential values were selected according to the cyclic voltammetric results discussed in Section 3. The potential program is optimised in view of avoiding large monomer concentration gradients at the electrode—electrolyte interface during electropolymerisation and to minimise the stripping of metal particles during the anodic pulses.

The initial step 0 V does not lead to faradaic reactions, but it is required to relax the compositional double layer. After this relaxation step, a layer of PPy is electrodeposited during the first anodic pulse 1. In the final anodic step of each cycle 1. For reference purposes, the same electrochemical experiments were duplicated with solutions that had been de-oxygenated by N 2 saturation. O 2 was bubbled for 20 min into the solution before the measurements and an O 2 blanket was maintained above the electrolyte during voltammetry.

The ORR Levich slopes have been evaluated by using current-voltage curves from which the N 2 -background had been subtracted. The current densities are referred to the geometric area. The photon beam was focused to a microprobe using zone plate optics and the imaging measurements were performed by simultaneous detection of transmitted and emitted fluorescence photons raster-scanning the sample with respect to the microprobe. XAS X-ray Absorption Spectroscopy spectroscopy can also be applied on specific points of interest by using a photodiode located downstream the specimen.

For the specific experiment shown in this paper XRF mapping was combined with absorption imaging. Photon energies in the ranges: — eV and — eV were chosen to set the best excitation conditions for Mn and Co and well as to measure stacks of absorption images, as detailed in Section 3. The deconvolution of the fluorescence spectrum for each pixel was performed with the PyMCA software package [ 44 ], by using the Hypermet algorithm and linear baseline subtraction.

Final data processing was carried out by Matlab Version 6. The L emission lines of Mn The post size of the beam was chosen between 1. It is worth emphasizing that, under the operating conditions adopted for this study, we did not assess any measurable radiation damage effect.Nel vince un premio di laurea erogato da Becromal s.

Course details. Teaching material. Scheda insegnamento. Materiale didattico. Scarica scheda insegnamento Apre una nuova finestra Apre una nuova finestra.

Download teaching card Apre una nuova finestra Apre una nuova finestra. Romano: "Influenza di alcuni parametri sperimentali sulle caratteristiche morfologiche di membrane di alumina preparate per via elettrochimica ".

Sciortino: "Elettrodeposizione e caratterizzazione di film elettrocromici su substrati ITO". Bozzini, M. Altissimo, M. Amati, P. Bocchetta, A. Gianoncelli, L. Gregoratti, G. Kourousias, L. Mancini, C. Mele, M. Kiskinova, In situ and ex situ x-ray microspectroelectrochemical methods for the study of zinc—air batteries, Reference Module in Chemistry, Molecular Sciences and Chemical Engineering Elsevier pp.

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Didattica A. Course details Teaching material. Scheda insegnamento Materiale didattico. Pubblicazioni P. Bocchetta, C. Sunseri, A. Bottino, G. Capannelli, G. Chiavarotti, S. Piazza, and F. Di Quarto"Asymmetric alumina membranes electrochemically formed in oxalic acid solution" Journal of Applied Electrochemistry,; P.

Sunseri, G. Chiavarotti and F. Sunseri, R. Masi, S. Piazza, F.These metrics are regularly updated to reflect usage leading up to the last few days. Citations are the number of other articles citing this article, calculated by Crossref and updated daily.

Find more information about Crossref citation counts. The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online.

Current Nanoscience

Clicking on the donut icon will load a page at altmetric. Find more information on the Altmetric Attention Score and how the score is calculated. In this paper we report on the fabrication and testing of a novel concept of sealed electrochemical microcell for in situ soft X-ray microspectroscopy in transmission, dedicated for nonvacuum compatible electrolytes. The microcell, fabricated using ultraviolet lithography, at variance with previous versions of electrochemical wet cells, that featured an optical window glued on top of the electrode system and a very limited electrolyte volume, the device presented here is a single solid block based around a microfabricated channel with fixed optical windows and apt for microfluidic work.

Moreover, this cell allows to employ an advanced electrodic geometry developed in our group — so far used only in open electrochemical cells for work with vacuum-compatible electrolytes - also with low-vapor pressure liquids, possibly saturated with the required gases.

The cell optimal electrode design allows three-electrode electrochemical control typical of traditional electrochemical experiments. The first electrochemical experiments with this new cell explore the electrochemical growth of a Co-polypyrrole, a composite electrocatalyst material with promising performance to replace the expensive Pt catalyst in fuel-cell oxygen electrodes.

Morphological and chemical-state distributions of Co codeposited with polypyrrole has been followed as a function of time and position, yielding unprecedented information on the processes relevant to the synthesis of this catalyst. View Author Information. Cite this: Anal.

patrizia bocchetta

Article Views Altmetric. Citations Cited By. This article is cited by 27 publications. Operando soft X-ray microscope study of rechargeable Zn-air battery anodes in deep eutectic solvent electrolyte. X-Ray Spectrometry48 5 Review of Scientific Instruments89 6 Jones, Grant A. Monitoring dynamic electrochemical processes with in situ ptychography. Applied Nanoscience8 4 Bozzini, M.

Altissimo, M. Amati, P. Bocchetta, A.


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