Repozitorij Univerze v Novi Gorici

Iskanje po repozitoriju
A+ | A- | Pomoč | SLO | ENG

Iskalni niz: išči po
išči po
išči po
išči po
* po starem in bolonjskem študiju

Opcije:
  Ponastavi


1 - 10 / 10
Na začetekNa prejšnjo stran1Na naslednjo stranNa konec
1.
2.
Role of spinodal-like wrinkling as a prenucleation process in crystallization of sol-gel derived thin films
Matjaž Valant, Mattia Fanetti, Uroš Luin, 2016, izvirni znanstveni članek

Najdeno v: osebi
Ključne besede: sol-gel, tanki filmi, crystalizacija
Objavljeno: 17.05.2016; Ogledov: 3897; Prenosov: 0
.pdf Polno besedilo (1,49 MB)

3.
Delovno poročilo za prvo tromesečje eGEM projekta
Matjaz Valant, Uroš Luin, končno poročilo o rezultatih raziskav

Najdeno v: osebi
Ključne besede: energetika, shranjevanje energije, elektroliza
Objavljeno: 23.09.2019; Ogledov: 2376; Prenosov: 0
.pdf Polno besedilo (707,01 KB)

4.
Electrolysis of Highly Concentrated FeCl2 Solution for Energy Storage in Solid Matter
Uroš Luin, 2020, objavljeni povzetek znanstvenega prispevka na konferenci

Najdeno v: osebi
Ključne besede: Energy storage, FeCl2(aq) electrolysis
Objavljeno: 11.12.2020; Ogledov: 1536; Prenosov: 0
.pdf Polno besedilo (22,13 MB)

5.
Structure and population of complex ionic species in FeCl[sub]2 aqueous solution by X-ray absorption spectroscopy
Matjaž Valant, Iztok Arčon, Uroš Luin, 2022, izvirni znanstveni članek

Opis: Technologies for mass production require cheap and abundant materials such as ferrous chloride (FeCl2). The literature survey shows the lack of experimental studies to validate theoretical conclusions related to the population of ionic Fe-species in the aqueous FeCl2 solution. Here, we present an in situ X-ray absorption study of the structure of the ionic species in the FeCl2 aqueous solution at different concentrations (1–4 molL−1) and temperatures (25–80 ◦C). We found that at low temperature and low FeCl2 concentration, the octahedral first coordination sphere around Fe is occupied by one Cl ion at a distance of 2.33 (±0.02) Å and five water molecules at a distance of 2.095 (±0.005) Å. The structure of the ionic complex gradually changes with an increase in temperature and/or concentration. The apical water molecule is substituted by a chlorine ion to yield a neutral Fe[Cl2(H2O)4]0. The observed substitutional mechanism is facilitated by the presence of the intramolecular hydrogen bonds as well as entropic reasons. The transition from the single charged Fe[Cl(H2O)5]+ to the neutral Fe[Cl2(H2O)4]0 causes a significant drop in the solution conductivity, which well correlates with the existing conductivity models.
Najdeno v: osebi
Ključne besede: structure, population, ionic species, aqueous ferrous chloride, in situ X-ray absorption spectroscopy
Objavljeno: 24.01.2022; Ogledov: 741; Prenosov: 20
URL Polno besedilo (0,00 KB)
Gradivo ima več datotek! Več...

6.
Electrolysis energy efficiency of highly concentrated FeCl[sub]2 solutions for power-to-solid energy storage technology
Matjaž Valant, Uroš Luin, 2022, izvirni znanstveni članek

Opis: An electrochemical cycle for the grid energy storage in the redox potential of Fe involves the electrolysis of a highly concentrated aqueous FeCl2 solution yielding solid iron deposits. For the high overall energy efficiency of the cycle, it is crucial to maximize the energy efficiency of the electrolysis process. Here we present a study of the influence of electrolysis parameters on the energy efficiency of such electrolysis, performed in an industrial-type electrolyzer. We studied the conductivity of the FeCl2 solution as a function of concentration and temperature and correlated it with the electrolysis energy efficiency. The deviation from the correlation indicated an important contribution from the conductivity of the ion-exchange membrane. Another important studied parameter was the applied current density. We quantitatively showed how the contribution of the resistance polarization increases with the current density, causing a decrease in overall energy efficiency. The highest energy efficiency of 89 ± 3% was achieved using 2.5 mol L−1 FeCl2 solution at 70 °C and a current density of 0.1 kA m−2. In terms of the energy input per Fe mass, this means 1.88 Wh g−1. The limiting energy input per mass of the Fe deposit was found to be 1.76 Wh g−1.
Najdeno v: osebi
Ključne besede: electrolysis, ferrous chloride, iron deposition, energy efficiency
Objavljeno: 16.02.2022; Ogledov: 651; Prenosov: 36
.pdf Polno besedilo (1,99 MB)
Gradivo ima več datotek! Več...

7.
Frekvenca X, Maja Ratej 02. 06. 2022
Uroš Luin, radijski ali tv dogodek

Opis: Mladi raziskovalci nizajo svoje poglede na to, kako se je znanost spreminjala takom zadnjih petih desetletij in kakšni izzivi jo čakajo v prihodnje
Najdeno v: osebi
Ključne besede: Radijski prispevek, Val 202, Frekvenca X, Znanost, Mladi
Objavljeno: 06.06.2022; Ogledov: 383; Prenosov: 0
.pdf Polno besedilo (275,80 KB)

8.
9.
10.
Correlation between FeCl2 electrolyte conductivity and electrolysis efficiency
Luin Uroš, Valant Matjaz, Arčon Iztok, 2022, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: The electrolysis efficiency is an important aspect of the Power-to-Solid energy storage technology (EST) based on the iron chloride electrochemical cycle [1]. This cycle employs an aqueous FeCl2 catholyte solution for the electro-reduction of iron. The metal iron deposits on the cathode. The energy is stored as a difference in the redox potential of iron species. Hydrogen, as an energy carrier, is released on demand over a fully controlled hydrogen evolution reaction between metallic Fe0 and HCl (aq) [1]. Due to these characteristics, the cycle is suitable for long-term high-capacity and high-power energy storage. In a previous work [2] we revealed that the electrolyte conductivity linearly increases with temperature. Contrary, the correlation between the electrolyte concentration and efficiency is not so straightforward. Unexpectedly small efficiency variations were found between 1 and 2.5 mol dm-3 FeCl2 (aq) followed by an abrupt efficiency drop at higher concentrations. To explain the behavior of the observed trends and elucidate the role of FeCl2 (aq) complex ionic species we performed in situ X-ray absorption studies. We made a dedicated experimental setup, consisting of a tubular oven and PMMA liquid absorption cell, and performed the measurements at the DESY synchrotron P65 beamline. The XAS investigation covered XANES and EXAFS analyses of FeCl2 (aq) at different concentrations (1 - 4 molL-1) and temperatures (25 - 80 °C). We found that at low temperature and low FeCl2 concentration the octahedral first coordination sphere around Fe is occupied by one Cl ion at a distance of 2.33 (±0.02) Å and five water molecules at a distance of 2.095 (±0.005) Å [3]. The structure of the ionic complex gradually changes with an increase in temperature and/or concentration. The apical water molecule is substituted by a chlorine ion to yield a neutral Fe[Cl2(H2O)4]0. The transition from the single charged Fe[Cl(H2O)5]+ to the neutral Fe[Cl2(H2O)4]0 causes a significant drop in the solution conductivity, which well correlates with the existing conductivity models [3]. [1] M. Valant, “Procedure for electric energy storage in solid matter. United States Patent and Trademark Office. Patent No. US20200308715,” Patent No. US20200308715, 2021. [2] U. Luin and M. Valant, “Electrolysis energy efficiency of highly concentrated FeCl2 solutions for power-to-solid energy storage technology,” J. Solid State Electrochem., vol. 26, no. 4, pp. 929–938, Apr. 2022, doi: 10.1007/S10008-022-05132-Y. [3] U. Luin, I. Arčon, and M. Valant, “Structure and Population of Complex Ionic Species in FeCl2 Aqueous Solution by X-ray Absorption Spectroscopy,” Molecules, vol. 27, no. 3, 2022, doi: 10.3390/molecules27030642.
Najdeno v: osebi
Povzetek najdenega: ...No. US20200308715,” Patent No. US20200308715, 2021. [2] U. Luin and M. Valant, “Electrolysis energy efficiency of...
Ključne besede: Iron chloride electrochemical cycle, Power-to-Solid energy storage, XANES, EXAFS, electrical conductivity, electrolyte complex ionic species structure and population
Objavljeno: 26.09.2022; Ogledov: 199; Prenosov: 0
.pdf Polno besedilo (27,64 MB)

Iskanje izvedeno v 0 sek.
Na vrh