Patrizia bocchetta

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Patrizia bocchetta

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.

patrizia bocchetta

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 — Mele C, Bozzini B Spectroelectrochemical investigation of the anodic and cathodic behaviour of zinc in 5.

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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.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.

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.

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B, Zhou, K. Enhanced catalytic activity of ceria nanorods from well-defined reactive crystal planes. Qin, G. 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.

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IBM J. Das, D.Due to the literature lack of accepted protocols for precise catalytic activity measurement at poly-Pt electrode in alkaline solution using the RDE methodology, we have also worked on the obtainment of an intralaboratory benchmark by evidencing some of the time-consuming parameters which drastically affect the reliability and repeatability of the measurement.

Notwithstanding the astonishing discrepancies among the ORR activities reported from different laboratories and typically attributed to experimental protocols, electrode conditioning, and current-potential curves corrections [ 1 ], the RDE technique—together with the RDDE one—seems to be the method most used by the electrochemists to characterize ORR electrocatalysts.

The reasons are simplicity and speed of the measurements as well as commercial availability and low cost of all the required facilities. For this specific electroanalytic application, poly-Pt can be considered as a standard electrode that, notwithstanding the intrinsically poorly defined nature of a polycrystalline surface, exhibits a very robust and reproducible electrochemical response.

Moreover, since standardized disks of poly-Pt are commercially available at convenient costs, their use as benchmark electrodes for the ORR electrocatalytic studies seems appropriate.

At present, ORR at Pt RDE electrodes of different forms wires, gauzes, foils, and disks of different areas has been widely investigated in acid solution [ 1 — 3 ], due to their relevance in polymer electrolyte fuel cells [ 4 ]. On the contrary marginal attention has been paid to pure Pt in alkaline solutions single crystal Pt [ 56 ], poly-Pt particles [ 7 ], poly-Pt wire [ 8 ], poly-Pt thin film [ 9 — 11 ], and poly-Pt rod [ 612 — 14 ] despite the fact that ORR plays a key role in the chlor-alkali technology and in metal-air batteries [ 1516 ].

Due to the absence of an interlaboratory benchmark material in alkaline solution and the discrepancies in the few data available at the moment [ 612 — 14 ], we have realized an intralaboratory poly-Pt benchmark against which the data gathered with novel ones can be safely gauged. For these reasons, research in alkaline ORR has been centred on catalysts featuring nonnoble metals [ 18 ] such as palladium [ 19 ], ruthenium [ 20 ], iron [ 2122 ], nickel and cobalt mainly in the form of spinels [ 23 — 26 ], perovskites [ 2728 ], and manganese oxides [ 1429 — 36 ].

One of the main limits of MnO x -based ORR electrocatalysts is their poor electrical conductivity: to overcome this problem commercial air cathodes have to be fabricated by combining oxides with conducting materials, mainly carbon nanoparticles [ 39 ]. Among other approaches favouring electronic contact to MnO xthe dispersion of metal oxide particles in a polypyrrole PPy matrix is also appealing for a series of physicochemical reasons, detailed in [ 40 — 43 ].

The first studies that have demonstrated the possibility of increasing the mixed oxide conductivity by using PPy [ 40 ] also showed that the deposition of alternating layers of PPy and MnCu or NiCu oxide spinel particles protects the catalytic sites against dissolution during ORR operation.

Before each PPy electrodeposition experiment, the pyrrole monomer was distilled under rotary pump vacuum several times typically three until it becomes colourless. All the solutions were prepared with ultrapure water from a Milli-Q system Millipore, Vimodrone MIItalyexhibiting a resistivity of Polycrystalline-Pt Poly-Pt rod was mechanically polished with different grades of grit paper, down to 0. All potentials are reported versus the reversible hydrogen electrode RHE scale.

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The electrochemical measurements were carried out at room temperature using a ParStat potentiostat. The initial step 0.

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After this relaxation step, a layer of PPy is electrodeposited during the first anodic pulse 2. During the subsequent cathodic pulse 0.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.

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. Cite this: Inorg. Article Views Altmetric. Citations PDF KB. Note: In lieu of an abstract, this is the article's first page. Cited By. This article is cited by 50 publications.

Mn-Catalyzed Electrochemical Chloroalkylation of Alkenes. ACS Catalysis9 1 Rathnayake, Hector W. Fraser, Euan K. Brechin, Scott J. Dalgarno, Jakob E. Baumeister, Pokpong Rungthanaphatsophon, Justin R. Walensky, Charles L. Barnes, Jerry L. Journal of the American Chemical Society40 Inorganic Chemistry53 4 Schafmeister, and Michael J.

Inorganic Chemistry52 11 Crabtree, and Gary W. Inorganic Chemistry51 7 Inorganic Chemistry48 7 Pecoraro and Sun Un. Inorganic Chemistry47 7 Pecoraro, and, Sun Un. Journal of the American Chemical Society45 Inorganic Chemistry46 7 Journal of the American Chemical Society39Either your web browser doesn't support Javascript or it is currently turned off.

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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.

patrizia bocchetta

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.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".

patrizia bocchetta

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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EP1357626A1 - Process for manufacturing a porous body - Google Patents

Orario di ricevimento Concordare app. Didattica A. Course details Teaching material. Scheda insegnamento Materiale didattico.


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