Ca/Li Synergetic-Doped NaNiMnO to Realize P2-O2 Phase Transition Suppression for High-Performance Sodium-Ion Batteries.

P2-type layered transition metal oxide NaNiMnO is considered as a promising cathode for advanced sodium-ion batteries due to its high theoretical specific capacity. However, the P2-type cathode suffers severe P2-O2 phase transition during cycling process, resulting unsatisfactory cyclic stability and rate capability. Herein, a Ca/Li co-doped P2-type NaCaNiMnLiO (NCNMLO) cathode material was synthesized through a simple sol-gel method.

Amino Group-Aided Efficient Regeneration Targeting Structural Defects and Inactive FePO Phase for Degraded LiFePO Cathodes.

It is urgent to develop efficient recycling methods for spent LiFePO cathodes to cope with the upcoming peak of power battery retirement. Compared with the traditional metallurgical recovery methods that lack satisfactory economic and environmental benefits, the direct regeneration seems to be a promising option at present. However, a simple direct lithium replenishment cannot effectively repair and regenerate the cathodes due to the serious structural damage of the spent LiFePO.

Linear-Organic-Ions In Situ-Intercalated MoS for Unveiling Capacitive Energy Storage Relies on the Chain Length.

Intercalating linear-organic-ions into the MoS interlayer is beneficial for optimizing electrons/ions' capacitive storage behavior. The chain length, as an important parameter of linear organic ions, can lead to differences in the dispersion, polarity, critical micelle concentration of organic ions, and steric hindrance to the growth of MoS nanosheets. Up until now, the relationship between chain length, synthesis of intercalated-MoS, and capacitive energy storage has not been unveiled.

Balancing Polarization and Breakdown for High Capacitive Energy Storage by Microstructure Design.

The compromise of contradictive parameters, polarization, and breakdown strength, is necessary to achieve a high energy storage performance. The two can be tuned, regardless of material types, by controlling microstructures: amorphous states possess higher breakdown strength, while crystalline states have larger polarization. However, how to achieve a balance of amorphous and crystalline phases requires systematic and quantitative investigations.

Recent progress in critical electrode and electrolyte materials for flexible zinc-ion batteries.

With the increasing popularity of flexible and wearable electronic devices, the demand for power supplies that can be easily bent or worn is also rapidly growing. However, traditional lithium ion batteries are difficult to adapt to complex wearable devices because of their unsatisfactory flexibility and thickness as well as safety issues. Zinc-ion batteries have several advantages, including low redox potential, high theoretical capacity, high safety, and abundant reserves.

Regulation of Sulfur Atoms in MoS by Magneto-Electrodeposition for Hydrogen Evolution Reaction.

Compared with crystalline molybdenum sulfide (MoS) employed as an efficient hydrogen evolution reaction (HER) catalyst, amorphous MoS exhibits better activity. To synthesize amorphous MoS, electrodeposition serving as a convenient and time-saving method is successfully applied. However, the loading mass is hindered by limited mass transfer efficiency and the available active sites require further improvement.

Two Birds with One Stone: V C MXene Synergistically Promoted VS Cathode and Zinc Anode for High-Performance Aqueous Zinc-Ion Batteries.

Aqueous zinc-ion batteries (AZIBs) are considered to be a rising star in the large-scale energy storage area because of their low cost and environmental friendliness properties. However, the limited electrochemical performance of the cathode and severe zinc dendrite of the anode severely hinder the practical application of AZIBs. Herein, a novel 3D interconnected VS ⊥V C T heterostructure material is prepared via one-step solvothermal method.

Surface Modification Driven Initial Coulombic Efficiency and Rate Performance Enhancement of Li Mn Ni Co O Cathode.

Due to its high energy density and low cost, Li-rich Mn-based layered oxides are considered potential cathode materials for next generation Li-ion batteries. However, they still suffer from the serious obstacle of low initial Coulombic efficiency, which is detrimental to their practical application. Here, an efficient surface modification method via NH H PO assisted pyrolysis is performed to improve the Coulombic efficiency of Li Mn Ni Co O , where appropriate oxygen vacancies, Li PO and spinel phase are synchronously generated in the surface layer of LMR microspheres.

Defect-Free Few-Layer M C T (M = V, Nb, Ta) MXene Nanosheets: Synthesis, Characterization, and Physicochemical Properties.

High-quality few-layer M C T (M = V, Nb, Ta) MXenes are very important for applications and are necessary for clarifying their physicochemical properties. However, the difficulty in etching for themselves and the existence of MC/MC and M-Al alloy impurities in their M AlC precursors seriously hinder the achievement of defect-free few-layer M C T (M = V, Nb, Ta) MXenes nanosheets. Herein, three different defect-free few-layer M C T (M = V, Nb, Ta) nanosheets are obtained by using a universal synthesis strategy of calcination, selective etching, intercalation, and exfoliation.

Phase Engineering of W-Doped MoS by Magneto-Hydrothermal Synthesis for Hydrogen Evolution Reaction.

Molybdenum disulfide (MoS ) has been proved as an excellent potential hydrogen evolution reaction (HER) catalyst. Compared with thermodynamically stable 2H-MoS , 1T-MoS exhibits higher conductivity and catalytic activity, whereas it is usually difficult to prepare since of thermodynamically metastable. Herein, a feasible method is reported to fabricate ambient-stable MoS with high concentration 1T phase through magnetic free energy synergistic microstrain induced by W doping under low magnetic field.

Synthesis of porous LaNiO thin films by chemical solution deposition for enhanced oxygen evolution reaction.

Herein, a facile chemical solution deposition (CSD) strategy is adopted to synthesize LaNiO (LNO) thin films with an obvious porous structure (P-LNO). It is demonstrated that the porous structure can greatly promote the OER performance of LNO, requiring an overpotential of 367 mV to achieve 10 mA cm, which is much lower than that of a normal LNO thin film (478 mV). As revealed by the following experimental results, the presence of the porous structure offers more exposed active sites and promotes electron transfer between catalysts and electrolyte, giving rise to an enhanced OER performance of the P-LNO film.

Carbon Foam-Supported VS Cathode for High-Performance Flexible Self-Healing Quasi-Solid-State Zinc-Ion Batteries.

As the new generation of energy storage systems, the flexible battery can effectively broaden the application area and scope of energy storage devices. Flexibility and energy density are the two core evaluation parameters for the flexible battery. In this work, a flexible VS material (VS @CF) is fabricated by growing the VS nanosheet arrays on carbon foam (CF) using a simple hydrothermal method.

Crystallinity Tuning of Na V (PO ) : Unlocking Sodium Storage Capacity and Inducing Pseudocapacitance Behavior.

As a promising cathode material of sodium-ion batteries, Na V (PO ) (NVP) has attracted extensive attention in recent years due to its high stability and fast Na ion diffusion. However, the reversible capacity based on the two-electron reaction mechanism is not satisfactory limited by the inactive M1 lattice sites during the insertion/extraction process. Herein, self-supporting 3D porous NVP materials with different crystallinity are fabricated on carbon foam substrates by a facile electrostatic spray deposition method.

Quenching and Electrical Current Poling Effect on Improved Ferroelectric and Piezoelectric Properties in BiFeO-Based High-Temperature Piezoceramics.

The effects of quenching on the structural, electrical, dielectric, ferroelectric (FE), and piezoelectric properties are investigated systematically in the 0.85BiFeCrO-0.15BaTiMnO (0 ≤ ≤ 0.

Intercalation Reaction in Amorphous Layer-Wrapped NiMoN/NiN Heterostructure Toward Efficient Lithium-Ion Storage.

Transition metal nitrides (TMNs) with high specific capacity and electric conductivity have drawn considerable attention as electrode materials of lithium-ion batteries (LIBs). However, the cycling stability of most TMNs is not satisfactory, which was caused by the large volume variation during cycles due to their intrinsic conversion reaction mechanism. Herein, by rational design, a much stable tremella-like NiMoN/NiN heterostructure with amorphous NiMoN wrapped layer has been fabricated.

Colossal 3D Electrical Anisotropy of MoAlB Single Crystal.

3D anisotropic functional properties (such as magnetic, electrical, thermal, and optical properties, etc.) in a single material are not only beneficial to the multipurpose of a material, but also helpful to enrich the regulatory dimensionality of functional materials. Herein, a colossal 3D electrical anisotropy of layered MAB-phase MoAlB single crystal is introduced and dissected.

Magneto-Electrodeposition of 3D Cross-Linked NiCo-LDH for Flexible High-Performance Supercapacitors.

Layered double hydroxides (LDHs) with outstanding redox activity on flexible current collectors can serve as ideal cathode materials for flexible hybrid supercapacitors in wearable energy storage devices. Electrodeposition is a facile, time-saving, and economical technique to fabricate LDHs. The limited loading mass induced by insufficient mass transport and finite exposure of active sites, however, greatly hinders the improvement of areal capacity.

Retainable Superconductivity and Structural Transition in 1T-TaSe Under High Pressure.

As a prominent platform possessing the properties of superconductivity (SC) and charge density wave (CDW), transition-metal dichalcogenides (TMDCs) have attracted considerable attention for a long time. Moreover, extensive efforts have been devoted for exploring the SC and/or the interplay between SC and CDW in TMDCs in the past few decades. Here, we systematically investigate the electronic properties and structural evolution of 1T-TaSe under pressure.

Pressure-Induced Electronic and Structural Transition in Nodal-Line Semimetal ZrSiSe.

The nodal-line semimetals have recently gained attention as a promising material due to their exotic electronic structure and properties. Here, we investigated the structural evolution and physical properties of nodal-line semimetal ZrSiSe under pressure via experiments and theoretical calculations. An isostructural electronic transition is observed at ∼6 GPa.

Photoinduced Broad-band Tunable Terahertz Absorber Based on a VO Thin Film.

The demand for terahertz (THz) communication and detection fuels continuous research for high performance of THz absorption materials. In addition to varying the materials and their structure passively, an alternative approach is to modulate a THz wave actively by tuning an external stimulus. Correlated oxides are ideal materials for this because the effects of a small external control parameter can be amplified by inner electronic correlations.

A High-Energy-Density Hybrid Supercapacitor with P-Ni(OH) @Co(OH) Core-Shell Heterostructure and Fe O Nanoneedle Arrays as Advanced Integrated Electrodes.

Transition metal hydro/oxides (TMH/Os) are treated as the most promising alternative supercapacitor electrodes thanks to their high theoretical capacitance due to the various oxidation states and abundant cheap resources of TMH/Os. However, the poor conductivity and logy reaction kinetics of TMH/Os severely restrict their practical application. Herein, hierarchical core-shell P-Ni(OH) @Co(OH) micro/nanostructures are in situ grown on conductive Ni foam (P-Ni(OH) @Co(OH) /NF) through a facile stepwise hydrothermal process.

Achieving Macroscopic VCT MXene by Selectively Etching Al from VAlC Single Crystals.

Hexagon-like MAX-phase VAlC single crystals grown by a high-temperature flux method were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and energy-dispersive X-ray spectroscopy (EDX). We report, for the first time, the first-order Raman spectra (RS) of VAlC single crystals experimentally and theoretically. Via the combination of the results of thermogravimetric analysis, differential scanning calorimetry, XRD, FE-SEM, and EDX, the oxidation performance and mechanism of VAlC single crystals between 300 and 1473 K in air were clarified.