1
|
Louzguine-Luzgin DV. Structural Changes in Metallic Glass-Forming Liquids on Cooling and Subsequent Vitrification in Relationship with Their Properties. MATERIALS (BASEL, SWITZERLAND) 2022; 15:7285. [PMID: 36295350 PMCID: PMC9610435 DOI: 10.3390/ma15207285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 09/30/2022] [Accepted: 10/06/2022] [Indexed: 06/16/2023]
Abstract
The present review is related to the studies of structural changes observed in metallic glass-forming liquids on cooling and subsequent vitrification in terms of radial distribution function and its analogues. These structural changes are discussed in relationship with liquid's properties, especially the relaxation time and viscosity. These changes are found to be directly responsible for liquid fragility: deviation of the temperature dependence of viscosity of a supercooled liquid from the Arrhenius equation through modification of the activation energy for viscous flow. Further studies of this phenomenon are necessary to provide direct mathematical correlation between the atomic structure and properties.
Collapse
Affiliation(s)
- D. V. Louzguine-Luzgin
- Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Aoba-Ku, Sendai 980-8577, Japan;
- MathAM-OIL, National Institute of Advanced Industrial Science and Technology (AIST), Sendai 980-8577, Japan
| |
Collapse
|
2
|
Sarac B, Ivanov YP, Micusik M, Karazehir T, Putz B, Dancette S, Omastova M, Greer AL, Sarac AS, Eckert J. Enhancement of Interfacial Hydrogen Interactions with Nanoporous Gold-Containing Metallic Glass. ACS APPLIED MATERIALS & INTERFACES 2021; 13:42613-42623. [PMID: 34491728 DOI: 10.1021/acsami.1c08560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Contrary to the electrochemical energy storage in Pd nanofilms challenged by diffusion limitations, extensive metal-hydrogen interactions in Pd-based metallic glasses result from their grain-free structure and presence of free volume. This contribution investigates the kinetics of hydrogen-metal interactions in gold-containing Pd-based metallic glass (MG) and crystalline Pd nanofilms for two different pore architectures and nonporous substrates. Fully amorphous MGs obtained by physical vapor deposition (PVD) co-sputtering are electrochemically hydrogenated by chronoamperometry. High-resolution (scanning) transmission electron microscopy and corresponding energy-dispersive X-ray analysis after hydrogenation corroborate the existence of several nanometer-sized crystals homogeneously dispersed throughout the matrix. These nanocrystals are induced by PdHx formation, which was confirmed by depth-resolved X-ray photoelectron spectroscopy, indicating an oxide-free inner layer of the nanofilm. With a larger pore diameter and spacing in the substrate (Pore40), the MG attains a frequency-independent impedance at low frequencies (∼500 Hz) with very high Bode magnitude stability accounting for enhanced ionic diffusion. On the contrary, on a substrate with a smaller pore diameter and spacing (Pore25), the MG shows a larger low-frequency (0.1 Hz) capacitance, linked to enhanced ionic transfer in the near-DC region. Hence, the nanoporosity of amorphous and crystalline metallic materials can be systematically adjusted depending on AC- and DC-type applications.
Collapse
Affiliation(s)
- Baran Sarac
- Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, 8700 Leoben, Austria
| | - Yurii P Ivanov
- Department of Materials Science & Metallurgy, University of Cambridge, Cambridge CB3 0FS, U.K
- School of Natural Sciences, Far Eastern Federal University, 690950 Vladivostok, Russia
| | - Matej Micusik
- Polymer Institute, Slovak Academy of Sciences, Dubravska cesta 9, 845 41 Bratislava, Slovakia
| | - Tolga Karazehir
- Department of Energy System Engineering, Adana Alparslan Türkeş Science and Technology University, Saricam, 01250 Adana, Turkey
| | - Barbara Putz
- Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, 8700 Leoben, Austria
- EMPA-Swiss Federal Laboratories for Materials Science and Technology, 3602 Thun, Switzerland
| | - Sylvain Dancette
- Univ. Lyon, INSA Lyon, MATEIS, UMR CNRS 5510, F-69621 Villeurbanne, France
| | - Maria Omastova
- Polymer Institute, Slovak Academy of Sciences, Dubravska cesta 9, 845 41 Bratislava, Slovakia
| | - A Lindsay Greer
- Department of Materials Science & Metallurgy, University of Cambridge, Cambridge CB3 0FS, U.K
| | - A Sezai Sarac
- Polymer Science and Technology, Istanbul Technical University, 34469 Istanbul, Turkey
| | - Jürgen Eckert
- Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, 8700 Leoben, Austria
- Department of Materials Science, Chair of Materials Physics, Montanuniversität Leoben, 8700 Leoben, Austria
- Adjunct with National University of Science and Technology ≪MISiS≫, Leninsky Prosp., 4, 119049 Moscow, Russia
| |
Collapse
|
3
|
Sarac B, Karazehir T, Ivanov YP, Putz B, Greer AL, Sarac AS, Eckert J. Effective electrocatalytic methanol oxidation of Pd-based metallic glass nanofilms. NANOSCALE 2020; 12:22586-22595. [PMID: 33135022 DOI: 10.1039/d0nr06372j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Compared to their conventional polycrystalline Pd counterparts, Pd79Au9Si12 (at%) - metallic glass (MG) nanofilm (NF) electrocatalysts offer better methanol oxidation reaction (MOR) in alkaline medium, CO poisoning tolerance and catalyst stability even at high scan rates or high methanol concentrations owing to their amorphous structure without grain boundaries. This study evaluates the influence of scan rate and methanol concentration by cyclic voltammetry, frequency-dependent electrochemical impedance spectroscopy and a related equivalent circuit model at different potentials in Pd-Au-Si amorphous NFs. Structural and compositional differences for the NFs are assessed by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray (EDX) mapping and X-ray diffraction (XRD). The ratio of the forward to reverse peak current density ipf/ipb for the MG NFs is ∼2.2 times higher than for polycrystalline Pd NFs, evidencing better oxidation of methanol to carbon dioxide in the forward scan and less poisoning of the electrocatalysts by carbonaceous (e.g. CO, HCO) species. Moreover, the electrochemical circuit model obtained from EIS measurements reveals that the MOR occurring around -100 mV increases the capacitance without any significant change in oxidation resistance, whereas CO2 formation towards lower potentials results in a sharp increase in the capacitance of the Faradaic MOR at the catalyst interface and a slight decrease in the corresponding resistance. These results, together with the high ipf/ipb = 3.37 yielding the minimum amount of carbonaceous species deposited on the thin film during cyclic voltammetry and stability in the alkaline environment, can potentially make these amorphous thin films potential candidates for fuel-cell applications.
Collapse
Affiliation(s)
- Baran Sarac
- Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, 8700 Leoben, Austria.
| | | | | | | | | | | | | |
Collapse
|
4
|
Sarac B, Zadorozhnyy V, Berdonosova E, Ivanov YP, Klyamkin S, Gumrukcu S, Sarac AS, Korol A, Semenov D, Zadorozhnyy M, Sharma A, Greer AL, Eckert J. Hydrogen storage performance of the multi-principal-component CoFeMnTiVZr alloy in electrochemical and gas–solid reactions. RSC Adv 2020; 10:24613-24623. [PMID: 35516196 PMCID: PMC9055208 DOI: 10.1039/d0ra04089d] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 06/10/2020] [Indexed: 02/05/2023] Open
Abstract
The single-phase multi-principal-component CoFeMnTiVZr alloy was obtained by rapid solidification and examined by a combination of electrochemical methods and gas–solid reactions. X-ray diffraction and high-resolution transmission electron microscopy analyses reveal a hexagonal Laves-phase structure (type C14). Cyclic voltammetry and electrochemical impedance spectroscopy investigations in the hydrogen absorption/desorption region give insight into the absorption/desorption kinetics and the change in the desorption charge in terms of the applied potential. The thickness of the hydrogen absorption layer obtained by the electrochemical reaction is estimated by high-resolution transmission electron microscopy. The electrochemical hydrogen storage capacity for a given applied voltage is calculated from a series of chronoamperometry and cyclic voltammetry measurements. The selected alloy exhibits good stability for reversible hydrogen absorption and demonstrates a maximum hydrogen capacity of ∼1.9 wt% at room temperature. The amount of hydrogen absorbed in the gas–solid reaction reaches 1.7 wt% at 298 K and 5 MPa, evidencing a good correlation with the electrochemical results. The single-phase multi-principal-component CoFeMnTiVZr alloy was obtained by rapid solidification and examined by a combination of electrochemical methods and gas–solid reactions.![]()
Collapse
|