Article
Engineering, Electrical & Electronic
Asmaa Ratep, Ismail Kashif
Summary: The study examines the impact of substituting CuO with Fe2O3 on the iron oxidation state and electrical conductivity of lithium borosilicate glass samples. Results indicate that the homogeneity of the glass increases with higher iron concentrations, and the ratios of Fe+2/Fe+3 are influenced by CuO. Moreover, iron ions in the glass samples mainly exist in the form of Fe2O3 in the ferrous state, with more than 7.5% concentration. Additionally, electrical conductivity is found to depend on the oxidation state of copper and the mixed transition metal effect.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Adilkhan Shokanov, Mikhail Vereshchak, Irina Manakova, Anastassiya Migunova
Summary: The bauxite ores of Kazakhstan were analyzed using various techniques, revealing the structural-phase composition and iron-bearing minerals within them.
Article
Electrochemistry
Aida Raauf, David Graf, Yakup Gonullu, Praveen K. Sekhar, Michael Frank, Sanjay Mathur
Summary: The nanostructured thin film of Nd2Sn2O7 pyrochlore obtained through solution processing shows unprecedented selectivity towards hydrogen sensing, with the highest sensitivity towards H-2 detected at 300 degrees Celsius. The high efficiency and reproducibility of the investigated sensor devices indicate the potential of Nd2Sn2O7 based sensors for hydrogen safety applications.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Materials Science, Ceramics
J. Leon-Flores, J. L. Perez-Mazariego, S. S. Flores-Morales, R. Hinojosa, E. P. Arevalo-Lopez, R. Escamilla, R. W. Gomez
Summary: Polycrystalline samples of iron bismuth antimony pyrochlore and iron bismuth tantalum pyrochlore were synthesized using the molten salts method. Their crystalline structures were determined by X-ray diffraction and their optical properties were investigated using spectroscopic techniques.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Khalid Mujasam Batoo, Ritesh Verma, Ankush Chauhan, Rajesh Kumar, Muhammad Hadi, Omar M. Aldossary, Y. Al-Douri
Summary: This study reported the synthesis of Gd and Nb co-doped BT ceramic oxides and investigated their structural and electrical properties. Various analysis techniques were used to characterize the samples, revealing the influence of Gd and Nb doping on the electrical properties of the ceramic materials, which were found to improve with increasing dopant concentration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Yogesh Kumar, S. Tripathi, Mangla Nand, R. Jangir, V. Srihari, A. Das, R. Singh, U. Deshpande, S. N. Jha, A. Arya
Summary: This study investigated the effect of Nd doping on the structural, optical, and electronic properties of lanthanum monazite structure. Pure and Nd-doped LaPO4 powders were prepared and analyzed for their composition, oxidation states, crystal structure, and bandgaps. The results confirmed the successful substitution of Nd in the LaPO4 matrix and provided insights into the local structure using extended X-ray absorption fine structure analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Piotr Gebara
Summary: The aim of this study was to investigate the large magnetocaloric effect in LaFe11.35Co0.6Si1.05 alloy. X-ray diffraction and Mossbauer spectroscopy confirmed the coexistence of La(Fe,Si)(13)-type and alpha-Fe(Co,Si) phases. The magnetic entropy change and phase transition were analyzed using thermomagnetic Maxwell relation, Landau theory, and universal scaling curve.
Article
Chemistry, Multidisciplinary
Hajime Kameo, Yudai Tanaka, Yoshihiro Shimoyama, Daisuke Izumi, Hiroyuki Matsuzaka, Yumiko Nakajima, Pierre Lavedan, Arnaud Le Gac, Didier Bourissou
Summary: A T-shaped Pt-0 complex with a diphosphine-borane (DPB) ligand was prepared. The Pt -> B interaction enhances the electrophilicity of the metal and triggers the addition of Lewis bases to give the corresponding tetracoordinate complexes. For the first time, anionic Pt-0 complexes are isolated and structurally authenticated.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Crystallography
Bilyana Kostova, Daniela Paneva, Zara Cherkezova-Zheleva, Katerina Mihaylova, Boyan Dumanov
Summary: This study investigates iron slags from two Bulgarian archaeological sites and determines the technology of ancient metallurgical process. The results show that the slags belong to the furnace bottom slags type achieved through bloomery technology, with furnace temperature around 900-1100 °C and iron extraction rate between 3.39% and 8.65%. These findings provide new insights for archaeological research in Bulgaria.
Article
Materials Science, Multidisciplinary
Kevin J. Pastoor, Michael J. Dzara, Svitlana Pylypenko, Jenifer C. Shafer, Mark P. Jensen
Summary: Uranium tetrafluoride (UF4) undergoes chemical speciation changes and forms hydrates when aged under high humidity conditions, indicating different hydration states depending on the temperature and relative humidity. These findings suggest that the presence of UF4 hydrate in UF4 materials may indicate storage under high humidity conditions.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Chemistry, Physical
Ritesh Verma, Ankush Chauhan, Khalid Mujasam Batoo, Muhammad Hadi, Emad H. Raslan, Rajesh Kumar, Muhammad Farzik Ijaz, Abdulaziz K. Assaifan
Summary: The synthesis of vanadium-doped BCZT ceramic oxides was reported in this paper, confirming the existence of a solubility limit of V in BCZT ceramics. Analysis revealed the influence of crystal structure and formation of oxygen vacancies on the luminescence and electrical properties of the material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Geochemistry & Geophysics
Giancarlo Della Ventura, Gunther J. Redhammer, Federico Galdenzi, Gennaro Ventruti, Umberto Susta, Roberta Oberti, Francesco Radica, Augusto Marcelli
Summary: This study investigates the stability of riebeckite at high temperatures under different oxidation conditions. The results show that riebeckite follows two distinct paths depending on the external environment. Under oxidizing conditions, it undergoes a dehydrogenation process, forming oxo-riebeckite, while under vacuum conditions, it undergoes a significant rearrangement of the cations. The findings have important implications for understanding the redox conditions and the role of Fe-amphiboles as carriers of water in geological processes.
AMERICAN MINERALOGIST
(2023)
Article
Chemistry, Multidisciplinary
Ashley P. P. Black, Andrea Sorrentino, Francois Fauth, Ibraheem Yousef, Laura Simonelli, Carlos Frontera, Alexandre Ponrouch, Dino Tonti, M. Rosa Palacin
Summary: Synchrotron radiation based techniques are powerful tools for battery research, providing insight into length scales, depth sensitivities, and spatial/temporal resolutions. Operando experiments enable characterization during battery operation and help elucidate reaction mechanisms. This article discusses the state of the art for relevant techniques (scattering, spectroscopy, and imaging) and addresses bottlenecks specific to battery applications, including cell design improvement, multi-modal characterization, and automated data analysis protocols. Accelerated progress is expected in these areas, fostering advancements in battery performance.
Article
Physics, Multidisciplinary
Dinesh Kumar Pati, Piyush R. Das, R. Padhee
Summary: In this research article, the functional properties of a perovskite ceramic compound, [Pb(Fe0.5Nb0.5)O-3](0.2)-[(Ca0.2Sr0.8)TiO3](0.8), prepared by the solid-state process, were reported. Various techniques such as X-ray photoelectron spectroscopy, Fourier transform infrared analysis, Raman spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Mossbauer spectroscopy were employed to analyze its characteristics. The compound showed a pseudocubic structure, dual oxidation states of certain elements, prominent perovskite vibrations, and weak ferroelectric response.
PRAMANA-JOURNAL OF PHYSICS
(2023)
Article
Materials Science, Ceramics
Ayano Nakamoto, Kohta Nambu, Hiroshi Masuda, Hidehiro Yoshida
Summary: Undoped Y2O3 polycrystals were densified by flash sintering under DC or AC electric field with varying holding times up to 60 min. The chemical bonding state and crystal structure were investigated by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), respectively. DC flash sintering with longer holding times (>= 30 min) resulted in blackening in cathodic regions, indicating the electrode-dependent introduction of neutral oxygen vacancies. The Y 3d3/2 and Y 3d5/2 binding energies decreased with increasing holding time in both DC- and AC-flash-sintered Y2O3 specimens, regardless of polarity, indicating that positively charged oxygen vacancies were introduced by the flash sintering in an electrode-independent manner, even under DC electric field. XRD analysis revealed short-range structural fluctuations in flash-sintered specimens with longer holding times. These electrode-dependent and independent point defect generations under electric fields may be related to the enhanced atomic diffusion during flash sintering.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Electrochemistry
Mario Valvo, Yu-Chuan Chien, Anti Liivat, Cheuk-Wai Tai
Summary: Noticeable voltage shifts were observed in a three-electrode cell during charge/discharge cycles of a lithium metal reference electrode and a deeply lithiated iron oxide (Fe/Li2O) negative electrode against a positive LiFePO4 counterpart. These shifts were attributed to charge storage anomalies caused by reduced Fe nanoparticle sizes in the Fe/Li2O nanocomposite. The shifts affected the voltage profiles of both the negative and positive electrodes, revealing asymmetric behavior of the Fe/Li2O electrode during Li+ uptake/release.
ELECTROCHIMICA ACTA
(2023)
Article
Materials Science, Multidisciplinary
Yi-Sheng Chen, Pang-Yu Liu, Ranming Niu, Arun Devaraj, Hung-Wei Yen, Ross K. W. Marceau, Julie M. Cairney
Summary: Modern transmission electron microscopy allows for probing a wide range of properties with high resolution. However, there is currently no unified framework for quantitatively mapping these properties onto chemically distinct features, especially in complex morphologies. In this study, we propose a data acquisition and analysis workflow called hypermodal data fusion, which allows for the direct coupling and joint analysis of highly disparate detector modes. We demonstrate the applicability of this workflow on a collection of anatase and rutile nanoparticles, showcasing how it can be used to extract polymorph-specific composition, bandgaps, and crystal structure.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Chemistry, Physical
Wessel W. A. van Ekeren, Marcelo Albuquerque, Gustav Ek, Ronnie Mogensen, William R. Brant, Luciano T. Costa, Daniel Brandell, Reza Younesi
Summary: To enhance battery safety, the development of non-flammable electrolytes is crucial. A new concept in this field is the use of localized highly concentrated electrolytes (LHCEs), which have lower viscosity, improved conductivity, and reduced costs compared to highly concentrated electrolytes (HCEs) due to the addition of diluent solvents. This study investigates the solvation structures of LHCEs using Raman spectroscopy and NMR spectroscopy, and molecular dynamics simulations reveal the formation of a highly concentrated Li+-TEP solvation sheath that can be protected by the diluents TTE and BTFE. The electrochemical performances of the LHCEs are evaluated in various cell configurations, with the TTE-based electrolyte performing better in full-cells and Li-metal cells compared to the BTFE-based electrolyte.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Luca Deiana, Abdolrahim A. Rafi, Cheuk-Wai Tai, Jan-E. Backvall, Armando Cordova
Summary: We disclose a novel and sustainable tandem-catalysis system for asymmetric synthesis, which is fabricated via bio-inspired self-assembly of artificial arthropod exoskeletons or artificial fungi cell walls containing enzyme and metal nanoparticles. The heterogeneous integrated enzyme/metal nanoparticle system co-catalyzes the dynamic kinetic resolution of primary amines, resulting in high yields and excellent enantiomeric excess of the corresponding amides. The use of natural-based and biocompatible structural components makes the system fully biodegradable and renewable, fulfilling important green chemistry requirements.
Article
Chemistry, Physical
Abdolkhaled Mohammadi, Sabrine Djafer, Syreina Sayegh, Andrew J. Naylor, Mikhael Bechelany, Reza Younesi, Laure Monconduit, Lorenzo Stievano
Summary: Although lithium metal and anode-free rechargeable batteries (LMBs and AFBs) have great potential as energy storage systems, the formation of high-surface lithium deposits during plating-stripping cycles hinders their practical applications. Efforts have been made to prevent this issue, such as electrolyte modification and electrode surface modification. However, the evaluation of battery performance using Coulombic efficiency (CE) is challenging due to various parameters. This study aims to reveal the interplay of several overlooked parameters and provide insights into the evaluation methods for LMBs and AFBs.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
ZeynabAlsadat Khatami Shal, Cheuk-Wai Tai, Michael Goepel, Roger Glaeser, Mozaffar Shakeri
Summary: In-situ growth of supported embryonic TS-1 zeolite (<10nm) on a silica support was achieved by steam-assisted crystallization(SAC). The use of low amounts of TPABr and steam at a moderate temperature of 130 degrees C was the key factor to control partial transformation of silica into supported embryonic TS-1. Supported embryonic TS-1 exhibits higher catalytic activity, resistance to poisoning, and selectivity compared to reference crystalline TS-1.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Electrochemistry
Florent Mohimont, Ronan Le Ruyet, Reza Younesi, Andrew J. J. Naylor
Summary: Alloy electrodes with high energy density are gaining interest in the field of Li-ion batteries, but they suffer from rapid pulverization and disconnection due to large volume changes. Ga-based liquid alloys, such as galinstan, have been studied as self-healing electrodes due to their ability to store Li and remain in a liquid state at room temperature. However, the lithiation mechanism and practical capacity of galinstan are still unknown. This study used electrochemical measurements, XRD, and SEM analyses to investigate the redox processes and structural properties of galinstan as an electrode material.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Electrochemistry
Girish D. D. Salian, Alma Mathew, Ritambhara Gond, Wessel van Ekeren, Jonathan Hojberg, Christian Fink Elkjaer, Matthew J. J. Lacey, Satu Kristiina Heiskanen, Daniel Brandell, Reza Younesi
Summary: This study investigates a 1 M lithium bis(fluorosulfonyl) imide (LiFSI) electrolyte in sulfolane (SL) without ethylene carbonate for LiNi0.5Mn1.5O4-graphite full-cells. The focus is on evaluating the anodic stability of the SL electrolyte and the passivation layers formed on LiNi0.5Mn1.5O4 (LNMO) and graphite, along with resistance measurements using intermittent current interruption (ICI) technique during cycling. The results show that the sulfolane electrolyte degrades more at higher potentials, contradicting previous reports of higher oxidative stability. However, the formed passivation layers due to electrolyte degradation prevent further degradation. The study provides new insights into the oxidative/anodic stability of sulfolane-based electrolyte.
BATTERIES & SUPERCAPS
(2023)
Article
Materials Science, Multidisciplinary
Vahid Saadattalab, Jiquan Wu, Cheuk-Wai Tai, Zoltan Bacsik, Niklas Hedin
Summary: The study investigates the use of activated carbon (AC) for the removal of volatile organic compounds (VOCs) from gas mixtures. The inclusion of inorganic phosphates on ACs enhances the low gas pressure uptake of acetone and isopropanol. The results suggest that ACs containing iron phosphate could be effective for the adsorption-driven removal of VOCs.
Article
Chemistry, Multidisciplinary
Shaowen Li, Zhigang Chai, Zhaohui Wang, Cheuk-Wai Tai, Jiefang Zhu, Kristina Edstroem, Yue Ma
Summary: This study comprehensively investigates the factors influencing lithium solubility in lithium-zinc alloy and analyzes the spatial distribution of intermediate alloy/lithium metallic species under different conditions. The driving force of lithium diffusion into the solid solution and the correlation between interfacial charge transfer thermodynamics and rate-limiting kinetics are explored. The study also explores lithiophilic alloy sites that promote homogeneous metal plating.
ADVANCED MATERIALS
(2023)
Article
Electrochemistry
Anastasiia Mikheenkova, Alexander J. Smith, Kristian B. Frenander, Yonas Tesfamhret, Niladri Roy Chowdhury, Cheuk-Wai Tai, Torbjoern Thiringer, Rakel Wreland Lindstroem, Maria Hahlin, Matthew J. Lacey
Summary: By combining electrochemical and material analysis, the study reveals that the loss of negative electrode material in the low state-of-charge (SoC) range is the main degradation mode in lithium ion batteries.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Luca Deiana, Elham Badali, Abdolrahim A. Rafi, Cheuk-Wai Tai, Jan-E Backvall, Armando Cordova
Summary: This article describes efficient nanogold-catalyzed cycloisomerization reactions of alkynoic acids and allenynamides, resulting in the formation of enol lactones and dihydropyrroles, respectively. The gold nanoparticles were immobilized on thiol-functionalized microcrystalline cellulose and exhibited robust catalytic activity for multiple cycles.
Article
Electrochemistry
Ali Jamal, Girish D. Salian, Alma Mathew, Wandi Wahyudi, Rodrigo P. Carvalho, Ritambhara Gond, Satu Kristiina Heiskanen, Daniel Brandell, Reza Younesi
Summary: This study presents the use of TMSPi and LiDFOB as film-forming additives in a conventional LiPF6-containing carbonate-based electrolyte solution to suppress the degradation of high-voltage lithium-ion battery electrolytes. TMSPi oxidizes on the LNMO cathode surface to form a stable cathode electrolyte interphase (CEI) layer, while LiDFOB has the potential to form a solid electrolyte interphase (SEI) on the graphite anode surface. The combination of these two additives effectively inhibits electrolyte degradation and improves capacity retention of high-voltage LIBs.
Article
Chemistry, Physical
Felix Massel, Burak Aktekin, Yi-Sheng Liu, Jinghua Guo, Magnus Helgerud Sorby, Daniel Brandell, Reza Younesi, Maria Hahlin, Laurent-Claudius Duda
Summary: This study investigated the first lithiation cycle of the positive electrode material LNMO using XAS and RIXS techniques. The results revealed that charge compensation in LNMO primarily occurs within the Ni-O bonds. RIXS analysis provided insights into the distribution of holes between Ni and O ions during delithiation. Additionally, the study highlighted the presence of non-trivial anionic activity.
Article
Chemistry, Physical
Lars Olow Simon Colbin, Charles Aram Hall, Ahmed S. Etman, Alexander Buckel, Leif Nyholm, Reza Younesi
Summary: This article investigates the impact of different electrolyte solutions on the anodic dissolution or passivation of aluminum in sodium-ion batteries. It is found that the type of electrolyte is critical for the presence of anodic dissolution, while the solvent alters the dissolution process.