Boosting hydrogen sorption kinetics and cyclic stability of MgH2 via synergistic Catalysis of Fe3O4@NiO Core-Shell Structures

Co9S8/NiCo2S4 core-shell array structure cathode hybridized with PPy/MnO2 core-shell structure anode for high-performance flexible quasi-solid-state alkaline aqueous batteries

Facile preparation of S-doped Cu/C core-shell composite for high-performance anode of pseudocapacitors

SiC–Sb–C nanocomposites as high-capacity and cycling-stable anode for sodium-ion batteries

SnO2 is considered as one of the high specific capacity anode materials for Lithium-ion batteries. However, the low electrical conductivity of SnO2 limits its applications. This manuscript reports a simple and efficient approach for the synthesis of Sb-doped SnO2 nanowires (NWs) core and carbon shell structure which effectively enhances the electrical conductivity and electrochemical performance of SnO2 nanostructures. Sb doping was performed during the vapor-liquid-solid synthesis of SnO2 NWs in a horizontal furnace. Subsequently, carbon nanolayer was coated on the NWs using the DC Plasma Enhanced Chemical Vapor Deposition approach. The carbon-coated shell improves the Solid-Electrolyte Interphase stability and alleviates the volume expansion of the anode electrode during charging and discharging. The Sb-doped SnO2 core carbon shell anode showed the superior specific capacity of 585 mAhg−1 after 100 cycles at the current density of 100 mA g−1, compared to the pure SnO2 NWs electrode. The cycle stability evaluation revealed that the discharge capacity of pure SnO2 NWs and Sb doped SnO2 NWs electrodes were dropped to 52 and 152 mAh g−1 after100th cycles. The process of Sb doping and carbon nano shielding of SnO2 nanostructures is proposed for noticeable improvement of the anode performance for SnO2 based materials.

Prussian blue analogs are well suited for sodium-ion battery cathode materials due to their cheap cost and high theoretical specific capacity. Nax CoFe(CN)6 (CoHCF), one of the PBAs, has poor rate performance and cycling stability, while Nax FeFe(CN)6 (FeHCF) has better rate and cycling performance. The CoHCF@FeHCF core-shell structure is designed with CoHCF as the core material and FeHCF as the shell material to enhance the electrochemical properties. The successfully prepared core-shell structure leads to a significant improvement in the rate performance and cycling stability of the composite compared to the unmodified CoHCF. The composite sample of core-shell structure has a specific capacity of 54.8 mAh g-1 at high magnification of 20 C (1C = 170mA g-1 ). In terms of cycle stability, it has a capacity retention rate of 84.1% for 100 cycles at 1 C, and a capacity retention rate of 82.7% for 200 cycles at 5 C. Kinetic analysis shows that the composite sample with the core-shell structure has fast kinetic characteristics, and the surface capacitance occupation ratio and sodium-ion diffusion coefficient are higher than those of the unmodified CoHCF.

Hydrogen storage properties of core-shell structured Mg@TM (TM = Co, V) composites

Achieving excellent energy storage reliability and endurance via mechanical performance optimization strategy in engineered ceramics with core-shell grain structure

The 5 V-cathode material LiNi0.5Mn1.5O4 microspheres with hollow, solid or core-shelled inner structures for the lithium-ion batteries are designed and fabricated by a multi-step synthesis procedure. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD) analysis, Fourier transformed infrared (FTIR) are employed to characterize the microstructures. Compared with the hollow and solid inner structures, the core-shell structured LiNi0.5Mn1.5O4 exhibits excellent cycling stability and outstanding rate performance, which delivers a discharge capacity of 111.5 mA h g−1 after 200 cycles at 1 C, and 98 mA h g−1 at 8 C, respectively. Further analyses with cyclic voltammetry and electrochemical impedance spectroscopy demonstrate that the core-shell structure can provide structural stability and shortened lithium diffusion path at both room and elevated temperatures.

Time and cost efficient post-synthesized core-shell NiCo-MOFs electrode for solid-state supercapacitors

The development of efficient bifunctional oxygen electrocatalysts is crucial for the advancement of rechargeable zinc-air batteries (ZABs). Herein, we report a novel core-shell structured high-entropy alloy (HEA) catalyst (FeCoNiCuMn@NC) derived from a multimetal Prussian blue analog (PBA), which integrates FeCoNiCuMn HEA nanoparticles encapsulated within a porous nitrogen-doped carbon network. FeCoNiCuMn@NC exhibits a well-defined interconnected carbon framework with abundant mesopores and a high specific surface area. The multicomponent HEA core induces lattice distortion that modulates the electronic structure of N-doped carbon (NC) shell, optimizing the electrocatalytic activity for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Benefiting from the synergistic interplay between the HEA core and the N-doped carbon shell, the catalyst demonstrates outstanding bifunctional ORR/OER activity, with a half-wave potential of 0.842 V for ORR and an overpotential of 400 mV at 10 mA cm-2 for OER. Moreover, the unique core-shell encapsulation structure effectively prevents nanoparticle agglomeration and protects the HEA core from corrosion in alkaline electrolyte, ensuring remarkable durability. As a demonstration of its practical potential, a ZAB incorporating the FeCoNiCuMn@NC air cathode achieves a peak power density of 135.8 mW cm-2 together with excellent rate capability and long-term cycling stability. This work offers a rational design strategy for HEA-based bifunctional electrocatalysts toward advanced energy storage devices.

Catalysts play an extraordinarily important role in accelerating the hydrogen sorption rates in metal-hydrogen systems. Herein, we report a surprisingly synergetic enhancement of metal-metal oxide cocatalyst on the hydrogen sorption properties of MgH2: only 5 wt % doping of Ni into ultrafine TiO2 enables a significant increase in hydrogen desorption kinetics; it absorbs 4.50 wt % hydrogen even at a low temperature of 50 °C. The striking improvement is partially ascribed to the formation of a particular Ni@TiO2 core-shell structure, thereby forming versatile interfaces. This study provides insights into the way of designing high-efficiency catalysts in hydrogen storage and other energy-related fields.

Preparation and electrochemical properties of Co doped core-shell cathode material on a lithium iron phosphate surface

Alleviated mechanical structure decay and accelerated transport kinetics via KNCHCF@NiHCF core–shell structure for aqueous potassium-ion batteries

Novel core shell structure to preclude phase segregation of iron-based oxygen carriers for chemical looping combustion

Fabrication of hierarchical carbon layer encapsulated polyaniline core-shell structure nanotubes and application in supercapacitors