Search results for " Template"

showing 10 items of 89 documents

Ni and Ni-Pd nanostructures electrodes for water-alkaline electrolyses

2017

Hydrogen production by water electrolysis (WE) is a very promising technology because it is a pollution free-process specially if renewable energy are employed. Up to day, the cost of hydrogen production by WE is higher than other available technologies, making WE not competitive. Many efforts have been made to improve WE performance, through the use of electrodes made of transition metal alloys (Pt2Mo, TiPt) as a cathode or pyrochlore type oxide (Tl2RuxIr2-xO7) as an anode [1]. In the field of water-alkaline electrolyzer, the development of cheap nanoporous nickel electrodes with high electrocatalytic features is one of the potential approaches to increase the WE performance [2]., A facile…

Hydrogen gas water splitting Ni nanowire template electrosynthesis alkaline solutionSettore ING-IND/23 - Chimica Fisica Applicata
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Lead Nanowires for Microaccumulators Obtained Through Indirect Electrochemical Template Deposition

2010

Metallic lead nanowires were deposited within pores of commercial anodic alumina membranes having an average pore diameter of 210 nm. "Direct" electrodeposition was attempted from 0.1 M Pb(NO 3 ) 2 aqueous solution with a variable concentration of H 3 BO 3 as a chelating agent, but it gave unsatisfactory results. An "indirect" two-step deposition procedure was then adopted, consisting of the anodic electrodeposition of α-PbO 2 nanowires, followed by their in situ reduction to metallic lead. Both these processes occurred at a high rate so that the indirect method led to a complete template pore filling with pure polycrystalline Pb in short times and with a high current efficiency.

In situAqueous solutionMaterials scienceGeneral Chemical EngineeringNanowireNanotechnologyElectrochemistryAnodeLead Nanowires; Lead-acid Batteries; Template Synthesis; Electrodeposition; Anodic Alumina MembranesSettore ING-IND/23 - Chimica Fisica ApplicataElectrodepositionChemical engineeringLead-acid BatterieTemplate SynthesiLead NanowireElectrochemistryGeneral Materials ScienceChelationCrystalliteElectrical and Electronic EngineeringPhysical and Theoretical ChemistryAnodic Alumina MembranesDeposition (law)
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Ion-Track Template Synthesis and Characterization of ZnSeO3 Nanocrystals

2022

A.I.P. thanks the Institute of Solid-State Physics, University of Latvia. ISSP UL as the Center of Excellence is supported through the Framework Program for European universities. The work was carried out within the framework of the grant AP05134367 of the Ministry Funding: The work was carried out within the framework of the grant AP05134367 of the Ministry of education and Science Science of of the Republic Republic of Kazakhstan.

Inorganic ChemistrySiO<sub>2</sub>/Si track template; chemical and electrochemical deposition; ZnSeO<sub>3</sub> nanocrystals; XRD study; quantum chemical calculationchemical and electrochemical depositionGeneral Chemical Engineering:NATURAL SCIENCES::Physics [Research Subject Categories]General Materials ScienceSiO2/Si track templateZnSeO3 nanocrystalsCondensed Matter Physicsquantum chemical calculationXRD studyCrystals
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Template electrosynthesis of La(OH)3 and Nd(OH)3 nanowires using porous anodic alumina membranes

2007

High quality arrays of Ln(OH)3 (Ln = La, Nd) nanowires have been successfully fabricated for the first time by an electrochemical process using anodic alumina membrane templates. A physico-chemical characterisation of electrodeposited hydroxides has been carried out by different techniques (XRD, SEM and EDX). The results show that the synthesized nanostructures are crystalline, dense, continuous, well aligned, and with high aspect ratio, suggesting further development of possible applications in the lanthanide family species. Keywords: Nanowires, Anodic alumina membranes, Hydroxide electrodeposition, Template, Lanthanide compounds

LanthanideNanostructureMaterials scienceAnodic alumina membranes Hydroxide electrodeposition Lanthanide compounds Nanowires TemplateScanning electron microscopeNanowireMineralogytemplatelanthanide compoundsElectrosynthesisElectrochemistrylcsh:ChemistryMembraneSettore ING-IND/23 - Chimica Fisica ApplicataChemical engineeringlcsh:Industrial electrochemistrylcsh:QD1-999hydroxide electrodepositionnanowires; anodic alumina membranes; hydroxide electrodeposition; template; lanthanide compoundsnanowireX-ray crystallographyElectrochemistryanodic alumina membranelcsh:TP250-261
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A Route to Grow Oxide Nanostructures Based on Metal Displacement Deposition: Lanthanides Oxy/Hydroxides Characterization

2012

LanthanideNanostructureMaterials scienceRenewable Energy Sustainability and the EnvironmentInorganic chemistryOxideCondensed Matter PhysicsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsCharacterization (materials science)Metalchemistry.chemical_compoundSettore ING-IND/23 - Chimica Fisica Applicatachemistryvisual_artMaterials ChemistryElectrochemistryvisual_art.visual_art_mediumDeposition (phase transition)Metal oxide template synthesis lanthanide oxide anodic allumina membrane galvanic depositionDisplacement (fluid)
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Anodic alumina membranes as template for the synthesis of 1-D metal oxide and hydroxide nanostructures

2008

Anodic alumina membranes with highly ordered cylindrical pores and tuneable geometry have been prepared (pore diameters=20−200 nm; pore density 1012-1014 pores/m2; thickness: 20-100 mm) by controlling the anodizing process of aluminum in phosphoric, oxalic and sulphuric acid. The influence of different parameters (initial treatment of aluminium surface, composition of electrolyte, temperature and applied potential) on the final characteristics of the membranes have been investigated. The use anodic alumina membranes as template for the electrosynthesis of some metal hydroxides and oxides 1-D nanostructures (nanowires and nanotubes) will be also proved.

Materials scienceAnodizingInorganic chemistryGeneral EngineeringOxidechemistry.chemical_elementElectrolyteAnodic alumina membranes Hydroxides Nanotubes Nanowires Template electrodepositionElectrosynthesisMetalchemistry.chemical_compoundMembranechemistryAluminiumvisual_artvisual_art.visual_art_mediumHydroxide
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Ni alloy nanowires as high efficiency electrode materials for alkaline electrolysers

2021

Abstract The fabrication and characterization of nickel-alloy electrodes for alkaline electrolysers is reported. Three different alloys (Ni–Co, Ni–Zn and Ni–W) at different composition were studied in order to determine the optimum condition. Nanostructured electrodes were obtained by template electrodeposition into a nanoporous membrane, starting from aqueous solution containing the two elements of the alloy at different concentrations. Composition of alloys can be tuned by electrolyte composition and also depends on the difference of the redox potential of elements and on the presence of complexing agents in deposition bath. Electrochemical and electrocatalytic tests, aimed at establishin…

Materials scienceFabricationAlloyNanowireEnergy Engineering and Power Technology02 engineering and technologyengineering.material010402 general chemistryElectrochemistry01 natural sciencesRedoxchemistry.chemical_compoundSettore ING-IND/17 - Impianti Industriali MeccaniciAlkaline electrolyzer Nanostructured electrodes Ni–Co Alloy Template electrosynthesisPotassium hydroxideAqueous solutionRenewable Energy Sustainability and the Environmenttechnology industry and agricultureequipment and supplies021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesSettore ING-IND/23 - Chimica Fisica ApplicataFuel TechnologyChemical engineeringchemistryElectrodeengineering0210 nano-technologyInternational Journal of Hydrogen Energy
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Nanostructured Ni–Co alloy electrodes for both hydrogen and oxygen evolution reaction in alkaline electrolyzer

2021

Abstract Ni–Co alloy nanostructured electrodes with high surface area were investigated both as a cathode and anode for an alkaline electrolyzer. Electrodes were obtained by template electrosynthesis at room temperature. The electrolyte composition was tuned in order to obtain different NiCo alloys. The chemical and morphological features of nanostructured electrodes were evaluated by EDS, XRD and SEM analyses. Results show that electrodes with different composition of Ni and Co, made of nanowires well anchored to the substrate, were obtained. For both hydrogen and oxygen evolution reactions, electrochemical and electrocatalytic tests, performed in 30% w/w KOH aqueous solution, were carried…

Materials scienceHydrogenEnergy Engineering and Power Technologychemistry.chemical_element02 engineering and technology010402 general chemistryElectrosynthesisElectrochemistry01 natural sciencesSettore ING-INF/01 - Elettronicalaw.inventionlawSettore ING-IND/17 - Impianti Industriali MeccaniciTafel equationElectrolysisRenewable Energy Sustainability and the EnvironmentAlkaline water electrolysisOxygen evolution021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesAnodeFuel TechnologySettore ING-IND/23 - Chimica Fisica ApplicataChemical engineeringchemistry0210 nano-technologyAlkaline electrolyzer HER Nanostructured electrodes Ni–Co Alloy OER Template electrosynthesis
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Nanostructured anode material for Li-ion batteries

2010

The present paper focuses on a nanostructured SnCo alloy electrochemically prepared by template method in view of its use as anode material alternative to graphite in lithium-ion batteries. The fabrication of SnCo nanowire arrays was carried out by potentiostatic co-deposition of the two metals by using nanostructured anodic alumina membranes as template. Electrochemical tests on lithiation-delithiation of these SnCo electrodes in conventional organic electrolyte (EC:DMC LiPF6) at 30°C showed that their specific capacity was stable for about the first 12 cycles at a value near to the theoretical one for Li22Sn5 and, hence, progressively decayed.

Materials scienceMetallurgyNanowireSNCO ALLOYElectrolyteElectrochemistrySnCo alloy template electrosynthesis alumina membrane anode lithium ion batteries electrochemical characterizationLithium-ion batteryAnodeSettore ING-IND/23 - Chimica Fisica ApplicataChemical engineeringALUMINA MEMBRANEElectrodeLITHIUM ION BATTERIESGraphiteANODETEMPLATE ELECTROSYNTHESISTemplate method pattern
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Synthesis of self-standing Pd nanowires via galvanic displacement deposition

2009

This work shows that it is possible to obtain self-standing Pd nanowires into anodic alumina membranes by a simple metal displacement deposition. By using a proper arrangement, specifically designed in order to optimize the process, polycrystalline Pd nanowires were deposited from a solution containing Pd(NH3)4(NO3)2 as precursor. Morphological analysis showed the formation of perfectly aligned nanowires with a uniform diameter throughout the entire length. This last parameter was controlled by both the deposition time and the ratio between the anodic area (active metal) and the cathodic area (pore bottom). Keywords: Displacement deposition, Template synthesis, Palladium nanowires, Alumina …

Materials scienceNanowireNanotechnologyAnodeCathodic protectionlcsh:ChemistryMembraneSettore ING-IND/23 - Chimica Fisica ApplicataChemical engineeringTransition metallcsh:Industrial electrochemistrylcsh:QD1-999ElectrochemistryGalvanic cellDeposition (phase transition)Displacement deposition Template synthesis Palladium nanowires Alumina membranesCrystallitelcsh:TP250-261Electrochemistry Communications
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