Constructing potential anodes for sodium-ion batteries(SIBs)with a wide temperature property has captured enormous interests in recent years.Fe1-xS,a zero-band gap material confirmed by density states calculation,is a...Constructing potential anodes for sodium-ion batteries(SIBs)with a wide temperature property has captured enormous interests in recent years.Fe1-xS,a zero-band gap material confirmed by density states calculation,is an ideal electrode for fast energy storage on account of its low cost and high theoretical capacity.Herein,Fe1-xS nanosheet wrapped by nitrogen-doped carbon(Fe1-xS@NC)is engineered through a post-sulfidation strategy using Fe-based metal-organic framework(Fe-MOF)as the precursor.The obtained Fe1-xS@NC agaric-like structure can well shorten the charge diffusion pathway,and significantly enhance the ionic/electronic conductivities and the reaction kinetics.As expected,the Fe1-xS@NC electrode,as a prospective SIB anode,delivers a desirable capacity up to 510.2 mA h g^-1 at a high rate of8000 mA g^-1.Additionally,even operated at low temperatures of 0 and-25°C,high reversible capacities of 387.1 and 223.4 mA h g^-1 can still be obtained at 2000 mA g^-1,respectively,indicating its huge potential use at harsh temperatures.More noticeably,the full battery made by the Fe1-xS@NC anode and Na3 V2(PO4)2 O2 F cathode achieves a remarkable rate capacity(186.8 mA h g^-1 at 2000 m A g^-1)and an impressive cycle performance(183.6 m A h g^-1 after 100 cycles at700 mA g^-1)between 0.3 and 3.8 V.Such excellent electrochemical performance is mainly contributed by its pseudocapacitive-dominated behavior,which brings fast electrode kinetics and robust structural stability to the whole electrode.展开更多
Nanometer micro-porous Nix Zn (1-x )Fe2O4power was synthesized by hydrotherm al method.This is first time to apply template to the synthesis.The structure,characteristics and cry stal appearance are studied further by...Nanometer micro-porous Nix Zn (1-x )Fe2O4power was synthesized by hydrotherm al method.This is first time to apply template to the synthesis.The structure,characteristics and cry stal appearance are studied further by XRD,DSC,TEM,etc.It is found that nanome ter micro-porous crystal is well-crystallized,well-degree of dispers ion and smaller than 100nm in diameter.More over,tri-ethylamine can be used to b e a ideal template in this synthesis,and the first time it is reported in our co untry.The synthesis mechanism is also preliminary discussed in this pap er.展开更多
SMnxZn1-xFe2O4 （x=1,0.9,0.8,0.7,0.6,0.5,0.25,0） nanoparticles were prepared by ball-milling hydrothermal and investigated by X-ray diffraction, DTG and TEM. Nanocrystallite grain size was determined by X-ray linewid...SMnxZn1-xFe2O4 （x=1,0.9,0.8,0.7,0.6,0.5,0.25,0） nanoparticles were prepared by ball-milling hydrothermal and investigated by X-ray diffraction, DTG and TEM. Nanocrystallite grain size was determined by X-ray linewidth to be from 63 A to 274 A. The thermal properties indicate absorbed water still remain at low temperature, crystalline wate will be decomposed from 230 ℃ to 260 ℃, partial Mn^2＋ will be oxidized near 730 ℃. TEM shows the ferrite particles pocess a spherical morphology and uniform nanosize.展开更多
Fe^3+and Zn^2+ions were doped into the lattice of CeO2 via the hydrothermal method.The micro structure and spectra features were analyzed systemically.XRD results show that the solid solubility of Fe^3+and Zn^2+ions i...Fe^3+and Zn^2+ions were doped into the lattice of CeO2 via the hydrothermal method.The micro structure and spectra features were analyzed systemically.XRD results show that the solid solubility of Fe^3+and Zn^2+ions in Ce1-x(Fe0.5Zn0.5)xO2 can be identified as x=0.16.The cell volumes are decreased by increasing the doped content.The TEM graphs prove that the grain size of the sample is about 10 nm,and the EDS result indicates that the doped contents are in accordance with that of the theory concentrations.Meanwhile,the doping also causes the increasing concentrations of the defects and oxygen vacancies which are supported by the XPS,Raman,UV and PL characterizations.The samples exhibit better catalytic activities for improving the hydrogen storage properties and the electrochemical kinetics of the ball milled Mg2Ni based composites.Further,the catalysis effects are improved by increasing the doped contents,which can be ascribed to the increasing contents of the oxygen vacancies,defects,the special electron transition states and the nature of the doped ions in CeO2-based solid solutions.展开更多
基金financially supported by the National Natural Science Foundation of China (21873018, 21573036 and 21274017)the open project of Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis (130028655)
文摘Constructing potential anodes for sodium-ion batteries(SIBs)with a wide temperature property has captured enormous interests in recent years.Fe1-xS,a zero-band gap material confirmed by density states calculation,is an ideal electrode for fast energy storage on account of its low cost and high theoretical capacity.Herein,Fe1-xS nanosheet wrapped by nitrogen-doped carbon(Fe1-xS@NC)is engineered through a post-sulfidation strategy using Fe-based metal-organic framework(Fe-MOF)as the precursor.The obtained Fe1-xS@NC agaric-like structure can well shorten the charge diffusion pathway,and significantly enhance the ionic/electronic conductivities and the reaction kinetics.As expected,the Fe1-xS@NC electrode,as a prospective SIB anode,delivers a desirable capacity up to 510.2 mA h g^-1 at a high rate of8000 mA g^-1.Additionally,even operated at low temperatures of 0 and-25°C,high reversible capacities of 387.1 and 223.4 mA h g^-1 can still be obtained at 2000 mA g^-1,respectively,indicating its huge potential use at harsh temperatures.More noticeably,the full battery made by the Fe1-xS@NC anode and Na3 V2(PO4)2 O2 F cathode achieves a remarkable rate capacity(186.8 mA h g^-1 at 2000 m A g^-1)and an impressive cycle performance(183.6 m A h g^-1 after 100 cycles at700 mA g^-1)between 0.3 and 3.8 V.Such excellent electrochemical performance is mainly contributed by its pseudocapacitive-dominated behavior,which brings fast electrode kinetics and robust structural stability to the whole electrode.
文摘Nanometer micro-porous Nix Zn (1-x )Fe2O4power was synthesized by hydrotherm al method.This is first time to apply template to the synthesis.The structure,characteristics and cry stal appearance are studied further by XRD,DSC,TEM,etc.It is found that nanome ter micro-porous crystal is well-crystallized,well-degree of dispers ion and smaller than 100nm in diameter.More over,tri-ethylamine can be used to b e a ideal template in this synthesis,and the first time it is reported in our co untry.The synthesis mechanism is also preliminary discussed in this pap er.
基金Basic Research for Application of Sichuan Province(No.05JY029-071-2)
文摘SMnxZn1-xFe2O4 （x=1,0.9,0.8,0.7,0.6,0.5,0.25,0） nanoparticles were prepared by ball-milling hydrothermal and investigated by X-ray diffraction, DTG and TEM. Nanocrystallite grain size was determined by X-ray linewidth to be from 63 A to 274 A. The thermal properties indicate absorbed water still remain at low temperature, crystalline wate will be decomposed from 230 ℃ to 260 ℃, partial Mn^2＋ will be oxidized near 730 ℃. TEM shows the ferrite particles pocess a spherical morphology and uniform nanosize.
基金supported by the National Natural Science Foundation of China(51962028,51501095)the Natural Science Foundation of Inner Mongolia(2017MS(LH)0516,2018MS05040,2018BS05010,2017MS(LH)0519)the Innovation Fund of Inner Mongolia University of Science and Technology(2018YQL02).
文摘Fe^3+and Zn^2+ions were doped into the lattice of CeO2 via the hydrothermal method.The micro structure and spectra features were analyzed systemically.XRD results show that the solid solubility of Fe^3+and Zn^2+ions in Ce1-x(Fe0.5Zn0.5)xO2 can be identified as x=0.16.The cell volumes are decreased by increasing the doped content.The TEM graphs prove that the grain size of the sample is about 10 nm,and the EDS result indicates that the doped contents are in accordance with that of the theory concentrations.Meanwhile,the doping also causes the increasing concentrations of the defects and oxygen vacancies which are supported by the XPS,Raman,UV and PL characterizations.The samples exhibit better catalytic activities for improving the hydrogen storage properties and the electrochemical kinetics of the ball milled Mg2Ni based composites.Further,the catalysis effects are improved by increasing the doped contents,which can be ascribed to the increasing contents of the oxygen vacancies,defects,the special electron transition states and the nature of the doped ions in CeO2-based solid solutions.
