Revealing Robust Room Temperature Ferromagnetism in Gd-Doped Few-Layered MoS Thin Films.

2D MoS holds great promise for spintronics, yet is limited by intrinsic diamagnetism. This study demonstrates inducing ferromagnetic behavior in MoS films doped with 0.47% Gd, achieving an ultrahigh saturation magnetization of 454 emu/cm in a few-layered film over 11-times higher than bulk films (40 nm).

High-temperature ferrimagnetic order triggered metal-to-insulator transition in CaCuNiOsO.

Ferromagnetic order-induced insulator-to-metal transitions via the double exchange mechanism have been studied widely. In contrast, ferromagnetic or ferrimagnetic spontaneous magnetization induced metal-to-insulator transitions (MITs), especially occurring above room temperature, remain extremely limited, although such magnetoelectric materials hold great potential for low-loss multifunctional electronic and spintronic devices. Here, a novel 3d/5d hybridized quadruple perovskite oxide, CaCuNiOsO, was synthesized.

[Research progress on NCOA4-mediated ferritinophagy and related diseases].

Nuclear receptor co-activator 4 (NCOA4) acts as a selective cargo receptor that binds to ferritin, a cytoplasmic iron storage complex. By mediating ferritinophagy, NCOA4 regulates iron metabolism and releases free iron in the body, thus playing a crucial role in a variety of biological processes, including growth, development, and metabolism. Recent studies have shown that NCOA4-mediated ferritinophagy is closely associated with the occurrence and development of iron metabolism-related diseases, such as liver fibrosis, renal cell carcinoma, and neurodegenerative diseases.

CaCuMnTeO: An Intrinsic Ferrimagnetic Insulator Prepared Under High Pressure.

CaCuMnTeO was synthesized using high-temperature and high-pressure conditions. The compound possesses an A- and B site ordered quadruple perovskite structure in 3̅ symmetry with the charge combination of CaCuMnTeO. A ferrimagnetic phase transition originating from the antiferromagnetic interaction between A' site Cu and B site Mn ions is found to occur at ≈ 100 K.

Insights into Reversible Sodium Intercalation in a Novel Sodium-Deficient NASICON-Type Structure:Na □ Co Fe V(PO ).

The rational design of novel high-performance cathode materials for sodium-ion batteries is a challenge for the development of the renewable energy sector. Here, a new sodium-deficient NASICON phosphate, namely Na □ Co Fe V(PO ) , demonstrating the excellent electrochemical performance is reported. The presence of Co allows a third Na to participate in the reaction thus exhibiting a high reversible capacity of ≈155 mAh g in the voltage range of 2.

Origin of the Seriously Limited Anionic Redox Reaction of Li-Rich Cathodes in Sulfide All-Solid-State Batteries.

Li-rich layered oxide (LLO) cathode materials with mixed cationic and anionic redox reactions display much higher specific capacity than other traditional layered oxide materials. However, the practical specific capacity of LLO during the first cycle in sulfide all-solid-state lithium-ion batteries (ASSLBs) is extremely low. Herein, the capacity contribution of each redox reaction in LLO during the first charging process is qualitatively and quantitatively analyzed by comprehensive electrochemical and structural measurements.

Unusual double ligand holes as catalytic active sites in LiNiO.

Designing efficient catalyst for the oxygen evolution reaction (OER) is of importance for energy conversion devices. The anionic redox allows formation of O-O bonds and offers higher OER activity than the conventional metal sites. Here, we successfully prepare LiNiO with a dominant 3dL configuration (L is a hole at O 2p) under high oxygen pressure, and achieve a double ligand holes 3dL under OER since one electron removal occurs at O 2p orbitals for Ni oxides.

Ni-Doped CuO Nanoarrays Activate Urea Adsorption and Stabilizes Reaction Intermediates to Achieve High-Performance Urea Oxidation Catalysts.

Urea oxidation reaction (UOR) with a low equilibrium potential offers a promising route to replace the oxygen evolution reaction for energy-saving hydrogen generation. However, the overpotential of the UOR is still high due to the complicated 6e transfer process and adsorption/desorption of intermediate products. Herein, utilizing a cation exchange strategy, Ni-doped CuO nanoarrays grown on 3D Cu foam are synthesized.

Comparative Study on the Magnetic and Transport Properties of B-Site Ordered and Disordered CaCuFeOsO.

The B-site Fe/Os ordered and disordered quadruple perovskite oxides CaCuFeOsO were synthesized under different high-pressure and high-temperature conditions. The B-site ordered CaCuFeOsO is a system with a very high ferrimagnetic ordering temperature of 580 K having the Cu(↑)Fe(↑)Os(↓) charge and spin arrangement. In comparison, the highly disordered CaCuFeOsO has a reduced magnetic transition temperature of about 350 K.

Mo-Incorporated Magnetite Fe O Featuring Cationic Vacancies Enabling Fast Lithium Intercalation for Batteries.

Transition metal oxides (TMOs) as high-capacity electrodes have several drawbacks owing to their inherent poor electronic conductivity and structural instability during the multi-electron conversion reaction process. In this study, the authors use an intrinsic high-valent cation substitution approach to stabilize cation-deficient magnetite (Fe O ) and overcome the abovementioned issues. Herein, 5 at% of Mo -ions are incorporated into the spinel structure to substitute octahedral Fe -ions, featuring ≈1.

/ Soft X-ray Spectroscopic Identification of a Co Intermediate in the Oxygen Evolution Reaction of Defective CoO Nanosheets.

Defect engineering is an important means of improving the electrochemical performance of the CoO electrocatalyst in the oxygen evolution reaction (OER). In this study, soft X-ray absorption spectroscopy (SXAS) is used to explore the electronic structure of CoO under OER for the first time. The defect-rich CoO (D-CoO) has a Co state with Co at both octahedral (O) and tetrahedral (T) sites and Co at O, whereas CoO has Co with Co and Co at T and O sites, respectively.

Feasibility to Improve the Stability of Lithium-Rich Layered Oxides by Surface Doping.

Li-rich layer-structured oxides are considered promising cathode materials for their specific capacities above 250 mAh·g. However, the drawbacks such as poor rate performance, fast capacity fading, and the continuous transition metal (TM) migration into the Li layer hinder their commercial applications. To address these issues, surface doping of Ti and Zr was conducted to the Li- and Mn-rich layered oxide (LMR), LiMnNiCoO.

Enhanced Magnetic Order and Reversed Magnetization Induced by Strong Antiferromagnetic Coupling at Hybrid Ferromagnetic-Organic Heterojunctions.

Organic-molecular magnets based on a metal-organic framework with chemically tuned electronic and magnetic properties have been attracting tremendous attention due to their promising applications in molecular magnetic sensors, magnetic particle medicines, molecular spintronics, etc. Here, we investigated the magnetic behavior of a heterojunction comprising a ferromagnetic nickel (Ni) film and an organic semiconductor (OSC) 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) layer. Through the magneto-optical Kerr effect (MOKE), a photoemission electron microscopy (PEEM), X-ray magnetic circular dichroism (XMCD), and X-ray photoelectron spectroscopy (XPS), we found that the adsorption of F4-TCNQ on Cu(100)/Ni not only reverses the in-plane magnetization direction originally exhibited by the Ni layer but also results in enhanced magnetic ordering.

Photonic-Crafting of Non-Volatile and Rewritable Antiferromagnetic Spin Textures with Drastic Difference in Electrical Conductivity.

Antiferromagnetic spintronics is an emerging field of non-volatile data storage and information processing. The zero net magnetization and zero stray fields of antiferromagnetic materials eliminate interference between neighbor units, leading to high-density memory integrations. However, this invisible magnetic character at the same time also poses a great challenge in controlling and detecting magnetic states in antiferromagnets.

New Undisputed Evidence and Strategy for Enhanced Lattice-Oxygen Participation of Perovskite Electrocatalyst through Cation Deficiency Manipulation.

Oxygen evolution reaction (OER) is a key half-reaction in many electrochemical transformations, and efficient electrocatalysts are critical to improve its kinetics which is typically sluggish due to its multielectron-transfer nature. Perovskite oxides are a popular category of OER catalysts, while their activity remains insufficient under the conventional adsorbate evolution reaction scheme where scaling relations limit activity enhancement. The lattice oxygen-mediated mechanism (LOM) has been recently reported to overcome such scaling relations and boost the OER catalysis over several doped perovskite catalysts.

A Ferrotoroidic Candidate with Well-Separated Spin Chains.

The search of novel quasi-1D materials is one of the important aspects in the field of material science. Toroidal moment, the order parameter of ferrotoroidic order, can be generated by a head-to-tail configuration of magnetic moment. It has been theoretically proposed that 1D dimerized and antiferromagnetic (AFM)-like spin chain hosts ferrotoroidicity and has the toroidal moment composed of only two antiparallel spins.

5f Covalency Synergistically Boosting Oxygen Evolution of UCoO Catalyst.

Electronic structure modulation among multiple metal sites is key to the design of efficient catalysts. Most studies have focused on regulating 3d transition-metal active ions through other d-block metals, while few have utilized f-block metals. Herein, we report a new class of catalyst, namely, UCoO with alternative CoO and 5f-related UO octahedra, as a unique example of a 5f-covalent compound that exhibits enhanced electrocatalytic oxygen evolution reaction (OER) activity because of the presence of the U 5f-O 2p-Co 3d network.

Boosting oxygen reduction activity and enhancing stability through structural transformation of layered lithium manganese oxide.

Structural degradation in manganese oxides leads to unstable electrocatalytic activity during long-term cycles. Herein, we overcome this obstacle by using proton exchange on well-defined layered LiMnO with an O3-type structure to construct protonated LiHMnO with a P3-type structure. The protonated catalyst exhibits high oxygen reduction reaction activity and excellent stability compared to previously reported cost-effective Mn-based oxides.

Os Doping Suppressed Cu-Fe Charge Transfer and Induced Structural and Magnetic Phase Transitions in LaCuFeOsO ( = 1 and 2).

B-site Os-doped quadruple perovskite oxides LaCuFeOsO ( = 1 and 2) were prepared under high-pressure and high-temperature conditions. Although parent compound LaCuFeO experiences Cu-Fe intermetallic charge transfer that changes the Cu/Fe charge combination to Cu/Fe at 393 K, in the Os-doped samples, the Cu and Fe charge states are found to be constant 2+ and 3+, respectively, indicating the complete suppression of charge transfer. Correspondingly, Os and mixed Os valence states are determined by X-ray absorption spectroscopy for = 1 and = 2 compositions, respectively.

Observation of novel charge ordering and spin reorientation in perovskite oxide PbFeO.

PbMO (M = 3d transition metals) family shows systematic variations in charge distribution and intriguing physical properties due to its delicate energy balance between Pb 6s and transition metal 3d orbitals. However, the detailed structure and physical properties of PbFeO remain unclear. Herein, we reveal that PbFeO crystallizes into an unusual 2a × 6a × 2a orthorhombic perovskite super unit cell with space group Cmcm.