LiMn2O4 spinel cathode materials were modified with 2 wt.%Li-M-PO4（M=Co,Ni,Mn） by polyol synthesis method.The phosphate surface-modified LiMn2O4 cathode materials were physically characterized by X-ray diffraction（...LiMn2O4 spinel cathode materials were modified with 2 wt.%Li-M-PO4（M=Co,Ni,Mn） by polyol synthesis method.The phosphate surface-modified LiMn2O4 cathode materials were physically characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM） and energy dispersive X-ray spectroscopy（EDS）.The charge-discharge test showed that the cycling and rate capacities of LiMn2O4 cathode materials were significantly enhanced by stabilizing the electrode surface with phosphate.展开更多
Nanomaterials with high specific surface area and high absorption capacity are attracting increased interest aimed at imparting the desired magnetic properties.This work is devoted to the study of the effect of heat t...Nanomaterials with high specific surface area and high absorption capacity are attracting increased interest aimed at imparting the desired magnetic properties.This work is devoted to the study of the effect of heat treatment in a hydrogen atmosphere on the microstructure,adsorption and magnetic properties of heterogeneous FePt/h-BN nanomaterials.Obtained via the polyol process,FePt nanoparticles(NPs)had a size<2 nm and were uniformly distributed over the surface of hexagonal boron nitride(h-BN)nanosheets.The temperature-activated fcc→fct phase transformation in ultrafine FePt NPs has been well documented.FePt NPs act as active centers dissociating H2 molecules and transfer adsorbed hydrogen atoms to the h-BN.Density functional theory(DFT)calculations also indicate that the h-BN substrate can absorb hydrogen adsorbed on the FePt NPs.This hydrogen circulation in the FePt/h-BN system promoted the fcc→fct phase transformation and allowed to control the magnetic properties.FePt/h-BN nanomaterials also exhibited a high adsorption capacity with respect to various organic dyes.展开更多
基金financially supported by the National High-Tech Research and Development(863) Program of China(No.2006AA11A160)the National Natural Science Foundation of China(No.50604018)
文摘LiMn2O4 spinel cathode materials were modified with 2 wt.%Li-M-PO4（M=Co,Ni,Mn） by polyol synthesis method.The phosphate surface-modified LiMn2O4 cathode materials were physically characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM） and energy dispersive X-ray spectroscopy（EDS）.The charge-discharge test showed that the cycling and rate capacities of LiMn2O4 cathode materials were significantly enhanced by stabilizing the electrode surface with phosphate.
基金The authors gratefully acknowledge the financial support from the Russian Science Foundation(No.20-79-10286)in the part of materials synthesis,characterization and study of magnetic properties and the Strategic Academic Leadership Program“Priority 2030”at NUST(MISiS)(strategic project:“Biomedical materials and bioengineering”)in the part of water treatmentA.V.B.acknowledges CzechNanoLab Research Infrastructure supported by MEYS CR(No.LM2018110)in the part of in situ XPS analysisZ.I.P.grateful to the Joint Supercomputer Center of the Russian Academy of Sciences,the Information Technology Centre of Novosibirsk State University,and the Materials Modelling and Development Laboratory at NUST(MISIS)(supported via the grant from the Ministry of Education and Science of the Russian Federation)(No.14.Y26.31.0005)for providing access to the cluster computational resources.
文摘Nanomaterials with high specific surface area and high absorption capacity are attracting increased interest aimed at imparting the desired magnetic properties.This work is devoted to the study of the effect of heat treatment in a hydrogen atmosphere on the microstructure,adsorption and magnetic properties of heterogeneous FePt/h-BN nanomaterials.Obtained via the polyol process,FePt nanoparticles(NPs)had a size<2 nm and were uniformly distributed over the surface of hexagonal boron nitride(h-BN)nanosheets.The temperature-activated fcc→fct phase transformation in ultrafine FePt NPs has been well documented.FePt NPs act as active centers dissociating H2 molecules and transfer adsorbed hydrogen atoms to the h-BN.Density functional theory(DFT)calculations also indicate that the h-BN substrate can absorb hydrogen adsorbed on the FePt NPs.This hydrogen circulation in the FePt/h-BN system promoted the fcc→fct phase transformation and allowed to control the magnetic properties.FePt/h-BN nanomaterials also exhibited a high adsorption capacity with respect to various organic dyes.
