Article
Engineering, Electrical & Electronic
Ahmet Teber, Mehmet F. Sarac
Summary: Co0.5Ni0.5CrxFe2 - xO4 nanoparticles with various chromium concentrations (0.0 <= x <= 1.0) were synthesized using the hydrothermal method. The structural, characteristic, dielectric, and magnetic features of the nanoparticles were analyzed using XRD, FT-IR, SEM-EDS, TEM-SAED, and VSM measurements. The results showed that the nanoparticles had a hexagonal crystal structure and their morphology changed from spherical to oval-shaped with increasing chromium content. The nanoparticles exhibited spinel structure formation and soft ferromagnetic property. The electromagnetic constitutive parameters and microwave absorption properties were determined based on S-parameters and return losses. The microwave absorption occurred in the frequency range of approximately 11 GHz to 12.4 GHz in the X-band and extended towards the Ku-band.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Yongjing Shi, Yeting Wen, Kevin Huang, Xiaolei Xiong, Jie Wang, Meilin Liu, Dong Ding, Yu Chen, Tong Liu
Summary: The present study demonstrates the enhancement of electrochemical oxygen reduction activity of porous LSCF cathodes by coating a thin film of PNM5. The PNM5 infiltration layer significantly reduces polarization resistance and promotes oxygen reduction reaction, leading to improved performance and lower degradation rate of the cathode.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Chen Li, Xiyan Li, Xiaowang Liu
Summary: This study reports the tuning of optical attributes of lanthanide-doped nanoparticles through simultaneous binary cation exchange, enabling both upconversion and downshifting emissions. The use of Tb3+ ions also helps maintain the integrity of the nanoparticles.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Biochemistry & Molecular Biology
Haihua He, Chonglai Chen, Chaoqun Bian, Junhua Ren, Jiajia Liu, Wei Huang
Summary: Ammonia decomposition is a promising method for high-purity hydrogen production, but it typically requires precious metals as catalysts. This study proposes using Ni/GdxCe1-xO2-delta catalysts to improve performance by adjusting support properties and investigates the underlying mechanism. It is found that Ni/Ce0.8Gd0.2O2-delta exhibits high catalytic activity and stability due to a high concentration of oxygen vacancies, highly dispersed Ni, and abundant strong basic sites.
Article
Engineering, Electrical & Electronic
M. H. Nasr, M. M. Elkholy, L. M. S. El-Deen, A. S. Abouhaswa, Gamal M. Turky, A. A. EL-Hamalawy
Summary: The flash auto-combustion method was used to synthesize nanocrystalline spinel ferrites with varying Ni-doping levels. The structural, dielectric, and magnetic properties of the synthesized ferrites were characterized. It was found that increasing Ni-doping content led to larger particle size and lattice strain, as well as higher saturation magnetization and coercivity. Fourier transform infrared spectroscopy analysis identified distinct absorption bands of spinel ferrites, and their dependency on Ni concentration was studied. X-ray diffraction examination confirmed the presence of the main cubic phase and hemitate hexagonal phase in the synthesized ferrites.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
Sergey V. Naumov, Maxim I. Vlasov, Elena Yu. Pikalova, Victor A. Tsvinkinberg, Olga G. Reznitskikh, Elena A. Filonova
Summary: Neodymium nickelates Nd2Ni1-xO4+delta with a wide range of Ni non-stoichiometry (x=0.0-0.08) are synthesized and their properties are studied. The XRD data shows that the materials in the x range of 0.0-0.06 have a single-phase orthorhombic structure with a Fmmm space group. TGA-DSC studies reveal that the phase transition temperature does not depend on Ni non-stoichiometry. Raman scattering studies show that at low Ni deficiency the Raman spectra are typical for the Ni-stoichiometric oxidized Nd2NiO4+(delta), while at x=0.06, lattice disorder and octahedral distortions reach a maximum feasibility.
SOLID STATE IONICS
(2023)
Article
Chemistry, Physical
Zhenfei Li, Pengkai Shan, Wei Tang, Qing Ni, Bin Qian, Shun Wang, Yifeng Zheng, Lin Ge, Han Chen, Caizhi Zhang
Summary: The thermal stability of Ruddlesden-Popper oxide Pr2NiO4+delta (PNO) as an air electrode in solid oxide electrolysis cells (SOECs) is poor at high temperatures (600-800 degrees C). In this study, the structural stability, electrochemical performance, and durability of PNO are improved by substituting praseodymium with barium. PBNO-x (x = 0, 0.1, 0.2, 0.3, and 0.4) samples are prepared and evaluated for high-temperature steam electrolysis in SOECs. The results show that the Ba-doped sample PBNO-0.2 has good chemical and thermal compatibility with the GDC electrolyte. Ba doping decreases the polarization resistance of the samples and improves the electrochemical performance of the PNO air electrode. PBNO-0.2 exhibits high catalytic activity and stability for high-temperature steam electrolysis in SOECs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
D. A. Osinkin
Summary: The electrochemical behavior of a Sr2Fe1.5Mo0.5O6-5-based double-layer electrode decorated with a symmetric catalyst by the wet impregnation technique for the simultaneous acceleration of cathodic and anodic reactions was investigated for the first time. The introduction of the symmetric catalyst effectively accelerated the rate of oxygen reduction at the cathode and hydrogen oxidation at the anode of solid oxide fuel cells with symmetric electrodes, leading to an increased power density at 800 degrees C under wet hydrogen/air condition.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Electrical & Electronic
Mohamed Ounacer, Abdelhamid El Boubekri, Bouchra Rabi, El-Hocine Agouriane, Abdellatif Essoumhi, Benilde F. O. Costa, Stanislaw M. Dubiel, Abdeslem Fnidiki, Fabienne Richomme, Jean Juraszek, Mohammed Sajieddine
Summary: This report investigates the synthesis and characterization of cobalt, nickel, copper, and magnesium nanoferrites. The results show that the synthesized nanoparticles have a spinel structure and agglomerated morphology. Mossbauer spectroscopy reveals the occupation of Fe3+ on two sub-lattices of the spinel system. The research also examines the magnetic properties of the spinel ferrites.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
A. Bajorek, C. Berger, M. Dulski, M. Zubko, S. Lewinska, K. Prusik, A. Slawska-Waniewska, F. Grasset, N. Randrianantoandro
Summary: The study compares NiFe2O4 (coprecipitation) and NiFe2O4@SiO2 (coprecipitation and microemulsion) ferrite nanoparticles in their as-received and annealed forms. The results show that thermal treatment induces gradual crystallization in the as-received samples, with the presence of cubic inverse spinel ferrite structure confirmed in all samples. FTIR spectroscopy confirms the spinel structure and other Fe-based states, while a nonstoichiometric hematite is detected in the annealed NiFe2O4 sample. The study also reveals changes in magnetic properties and electronic structure with the effects of crystallization, grain growth, and hematite separation.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Physics, Multidisciplinary
P. Hemme, J-c. Philippe, A. Medeiros, A. Alekhin, S. Houver, Y. Gallais, A. Sacuto, A. Forget, D. Colson, S. Mantri, B. Xu, L. Bellaiche, M. Cazayous
Summary: This study investigates the effect of strain on the ferroelectricity and dynamic magnetic response of BiFeO3. The results show that the ferroelectric soft mode is significantly enhanced under tensile strain, and low energy magnon modes are suppressed, indicating a transition from cycloidal to homogeneous magnetic state. Effective Hamiltonian calculations reveal the competition between the ferroelectric and antiferrodistortive modes in the tensile regime.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Ceramics
Hamideh Shakeripour, Seyed Sajjad Hosseini, Seyedeh Sara Ghotb, Behnaz Hadi-Sichani, Sepideh Pourasad
Summary: The study introduced Fe, Co and Ni magnetic impurities into superconducting cuprate YBa2Cu3O7-delta, resulting in an increase in Tc, while non-magnetic dopings showed a decrease in Tc.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Galina Kozhina, Valentin Mitrofanov, Olga Fedorova, Andrey Fetisov, Aidar Murzakaev, Svetlana Estemirova
Summary: Nanograin polycrystalline Nd1-xCaxMnO3 +/-delta (x = 0; 0.15; 0.25) with orthorhombic structure were obtained by mechanical activation with an average crystallite size of 10-30 nm. Grain growth was found to be kinetically hindered in Ca-doped compositions despite the lower activation energy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Qingtao Shen, Chunli Yang, Weiji Cao, Jun Li, Lei Wang, Wei Yao, Yanru Liang, Kai Wang, Sining Yun
Summary: This study investigated the electrochemical properties of La2Ce2O7 materials with Mg doping. The results showed that La2xMgxCe2O7-delta sample with x = 0.15 exhibited the highest conductivity and hydrogen permeation flux. The hydrogen permeation mechanism was influenced by the thickness of the membrane, with surface diffusion controlling the process in thin membranes and bulk diffusion in thick membranes. Surface modification with Pt and Ni improved the hydrogen permeability of the membrane. The Ni-La2-xMgxCe2O7-delta membranes with different Mg contents showed good stability in a humid atmosphere with 20% CO2.
CERAMICS INTERNATIONAL
(2023)
Article
Crystallography
Kacper Cichy, Konrad swierczek
Summary: Research on hexagonal rare-earth manganites reveals that the total electrical conductivity is significantly influenced by the oxygen excess delta and the doping of Nd3+ or Pr3+, with materials in different atmospheres at high temperatures showing similar conductive characteristics.
Review
Physics, Condensed Matter
Alexander A. Tsirlin, Philipp Gegenwart
Summary: This article reviews the progress in studying and understanding the Kitaev model on lithium iridate Li2IrO3, as well as discussing the feasibility, effectiveness, and repercussions of tuning strategies based on external pressure and chemical substitutions.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Electrochemistry
K. A. Dosaev, S. Ya. Istomin, D. A. Strebkov, G. A. Tsirlina, E. V. Antipov, E. R. Savinova
Summary: Using RDE and CV techniques, electrochemical behavior of different AMn2O4 spinel oxides in an alkaline solution, especially in the ORR, was studied. Surface modifications were observed on the studied spinels (except for MgMn2O4) during potential cycling, contact with alkaline solution, and electrode preparation. Mn3O4 spinel showed the strongest surface modifications due to the presence of easily oxidizable and unstable Mn(II). This work highlights the importance of degradation processes on the electrochemical characteristics of materials in the field of electrocatalysis.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Physical
Zoya V. Bobyleva, Oleg A. Drozhzhin, Anastasia M. Alekseeva, Kirill A. Dosaev, Georgy S. Peters, Grigorii P. Lakienko, Tatiana I. Perfilyeva, Nikita A. Sobolev, Konstantin I. Maslakov, Serguei V. Savilov, Artem M. Abakumov, Evgeny V. Antipov
Summary: This study comprehensively explores the pretreatment of phenol-treated hard carbon anode materials and their impact on electrochemical performance. The results show that the conditions of the pretreatment step have a significant influence on the microstructure and electrochemical performance of the hard carbon.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Nellie R. Khasanova, Rodion V. Panin, Ilia R. Cherkashchenko, Maxim V. Zakharkin, Daniil. A. Novichkov, Evgeny V. Antipov
Summary: The NASICON-type NaNbV(PO4)(3) electrode material synthesized by the Pechini sol-gel technique undergoes a reversible three-electron reaction in a Na-ion cell, providing a reversible capacity of 180 mAh·g(-1). The structural characterization reveals the reversible evolution of the NaNbV(PO4)(3) framework during cycling, and XANES measurements confirm the multielectron transfer during sodium intercalation/extraction. This electrode material demonstrates extended cycling stability and excellent rate capability, making it suitable for high-power and long-life sodium-ion batteries.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Vitalii A. Shevchenko, Iana S. Glazkova, Daniil A. Novichkov, Irina Skvortsova, Alexey V. Sobolev, Artem M. Abakumov, Igor A. Presniakov, Oleg A. Drozhzhin, Evgeny V. Antipov
Summary: Sodium-ion batteries using O3-type NaNi1/3Fe1/3Mn1/3O2 layered oxide as positive electrodes have restricted electrochemical performance due to the voltage limit of 4.0 V. Further reduction of sodium content leads to capacity degradation. The study presents the redox transitions occurring during charge and discharge of O3-NaNi1/3Fe1/3Mn1/3O2.
CHEMISTRY OF MATERIALS
(2023)
Article
Energy & Fuels
Jordi Jacas Biendicho, Pedro Mazaira, Hemesh Avireddy, Chaoqi Zhang, Pengyi Tang, Alexander Missyul, Lluis Trilla, Jordi Arbiol, Joan Ramon Morante, Andreu Cabot
Summary: A new cathode material, FeS2-decorated carbon nanofiber (CNF), has been proposed for Li-S batteries to enhance the cycling stability typically displayed by sulfur composites. The composite material shows a complex architecture with a CNF matrix hosting the sulfur and FeS2 nanoparticles acting as a catalyst. The FeS2-decorated CNF cathode delivers high discharge capacities and stable capacity retention, making it highly promising for the next generation of electrochemical energy storage devices.
Article
Energy & Fuels
Ruslan R. Samigullin, Maxim V. Zakharkin, Oleg A. Drozhzhin, Evgeny V. Antipov
Summary: The thermal stability of NASICON-type cathode materials for sodium-ion batteries was investigated using DSC and in situ HTPXRD. Analysis of Na3V2(PO4)(3) and Na4VMn(PO4)(3) showed that the Mn-substituted cathode material exhibited poorer thermal stability in the charged state, with amorphization of Na4VMn(PO4)(3)-based electrodes occurring at 150 to 250 degrees Celsius.
Article
Chemistry, Physical
Thomas Thersleff, Jordi Jacas Biendicho, Kunkanadu Rajappa Prakasha, Elias Martinez Moreno, Leif Olav Josang, Jekabs Grins, Aleksander Jaworski, Gunnar Svensson
Summary: Chemical doping can narrow the performance gap between Co-free and Co-containing lithium ion batteries, improving their longevity and stability. Optimized doping profiles enhance the structural and chemical compatibility of the layered Mn oxide system, resulting in unobstructed lithium ion pathways.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Aleksei V. Kubarkov, Alexander V. Babkin, Oleg A. Drozhzhin, Keith J. Stevenson, Evgeny V. Antipov, Vladimir G. Sergeyev
Summary: In this study, a combination of LiFePO4 active material with single-walled carbon nanotubes as conductive additive was used to develop high-energy-density cathodes for Li-ion batteries. The effect of different morphologies of the active material particles on the electrochemical characteristics of the cathodes was investigated. Spherical LiFePO4 microparticles provided higher packing density but had poorer contact with the current collector and lower rate capability compared to plate-shaped LiFePO4 nanoparticles.
Article
Chemistry, Multidisciplinary
Chao Yue Zhang, Xuan Lu, Xu Han, Jing Yu, Chaoqi Zhang, Chen Huang, Lluis Balcells, Alba Garzon Manjon, Jordi Jacas Biendicho, Junshan Li, Jordi Arbiol, Gengzhi Sun, Jin Yuan Zhou, Andreu Cabot
Summary: This study investigates the influence of the geometric configuration and composition of ABX spinel catalysts on their catalytic mechanisms and polysulfide conversion. The results show that Co-oh (3+) serves as the active site for breaking S-S bonds, while Co-td (2+) functions as the active site for forming S-Na bonds. This research highlights the subtle relationship between the activity and geometric configuration of spinel catalysts, offering insights for the rational development of improved catalysts by optimizing their atomic geometric configuration.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Denis S. Lutsenko, Ekaterina V. Belova, Maxim V. Zakharkin, Oleg A. Drozhzhin, Evgeny V. Antipov
Summary: Sodium-ion batteries have the potential to replace lithium-ion and lead-acid batteries, and high efficiency in a wide temperature range is important. This article analyzes the phase equilibria and electrochemical properties of sodium-ion battery electrolytes based on different solvent mixtures. The electrolyte based on ethylene carbonate and diethyl carbonate shows excellent performance at low temperatures and could be a promising basis for the further development of low-temperature sodium-ion batteries.
CHEMISTRY-SWITZERLAND
(2023)
Article
Materials Science, Multidisciplinary
A. Revelli, M. Moretti Sala, G. Monaco, M. Magnaterra, J. Attig, L. Peterlini, T. Dey, A. A. Tsirlin, P. Gegenwart, T. Froehlich, M. Braden, C. Grams, J. Hemberger, P. Becker, P. H. M. van Loosdrecht, D. I. Khomskii, J. van den Brink, M. Hermanns, M. Grueninger
Summary: Ba3InIr2O9 is a promising candidate for quantum spin-liquid behavior and exhibits magnetism from spin-orbit entangled quasimolecular moments. Our study reveals its unique electronic states and excitations through various experimental and computational methods.
Article
Materials Science, Multidisciplinary
M. Wenzel, B. R. Ortiz, S. D. Wilson, M. Dressel, A. A. Tsirlin, E. Uykur
Summary: Temperature-dependent reflectivity studies have been conducted on the nonmagnetic kagome metal RbV3Sb5, revealing the spectral characteristics in a broad energy range. The observations indicate the formation of charge-density wave and the significance of electron-phonon coupling.
Article
Materials Science, Multidisciplinary
Bin Shen, Franziska Breitner, Danil Prishchenko, Rudra Sekhar Manna, Anton Jesche, Maximilian L. Seidler, Philipp Gegenwart, Alexander A. Tsirlin
Summary: Magnetization measurements were performed on α-Li2IrO3 under hydrostatic pressures, and the temperature-pressure phase diagram was established. The material undergoes a first-order phase transition from a magnetic phase to a nonmagnetic dimerized phase above 1.2 GPa. The critical pressure of the structural dimerization shows strong temperature dependence.
Article
Chemistry, Inorganic & Nuclear
Manuel Feig, Wilder Carrillo-Cabrera, Matej Bobnar, Paul Simon, Caroline Curfs, Volodymyr Levytskyi, Alexander A. Tsirlin, Andreas Leithe-Jasper, Roman Gumeniuk
Summary: This article investigates the polymorphism and structural relationships of compounds from the Y3+xRh4Ge13-x and Y3+xIr4Ge13-x series. It is found that these compounds are weakly-coupled superconductors with low thermal conductivity and small Seebeck coefficients. Additionally, Y3Rh4Ge13 undergoes a first-order phase transition at 177 K, possibly related to a charge density wave.
DALTON TRANSACTIONS
(2022)
