Sodium-ion batteries(SIBs)have the advantages of environmental friendliness,cost-effectiveness,and high energy density,which are considered one of the most promising candidates for lithium-ion batteries(LIBs).The cath...Sodium-ion batteries(SIBs)have the advantages of environmental friendliness,cost-effectiveness,and high energy density,which are considered one of the most promising candidates for lithium-ion batteries(LIBs).The cathode materials influence the cost and energy output of SIBs.Therefore,the development of advanced cathode materials is crucial for the practical application of SIBs.Among various cathode materials,layered transition metal oxides(LTMOs)have received widespread attention owing to their straightforward preparation,abundant availability,and cost-competitiveness.Notably,layered Fe-based oxide cathodes are deemed to be one of the most promising candidates for the lowest price and easy-to-improve performance.Nevertheless,the challenges such as severe phase transitions,sluggish diffusion kinetics and interfacial degradation pose significant hurdles in achieving high-performance cathodes for SIBs.This review first briefly outlines the classification of layered structures and the working principle of layered oxides.Then,recent advances in modification strategies employed to address current issues with layered iron-based oxide cathodes are systematically reviewed,including ion doping,biphasic engineering and surface modification.Furthermore,the review not only outlines the prospects and development directions for layered Fe-based oxide cathodes but also provides novel insights and directions for future research endeavors for SIBs.展开更多
After different heat treatment processes, the metal compound, the microstructure and the hardness of the C-Cr-W- Mo-V-RE Fe-based hardfacing layers are investigated by means of metallographic microscope, X-ray diffrac...After different heat treatment processes, the metal compound, the microstructure and the hardness of the C-Cr-W- Mo-V-RE Fe-based hardfacing layers are investigated by means of metallographic microscope, X-ray diffraction （ XRD ）, energy dispersive spectrum（ EDS ）, transmission electron microscope（TEM） and hardness tester. The results show that the hardfacing layers have higher tempering stability and secondary hardening property. After quenching at 820 ℃ ,the hardness value（ HRC37 ） and the microstructure of the layers are similar to that normalized at 820 - 1 000 ℃. The tempering stability and the hardness increases with increasing quench temperature, which is attributed to the amount of the alloy element in the matrix. These results are very helpful for improving the mechanical properties of the hardfacing layers.展开更多
After tempering treatment at different conditions, the tempering stability of Fe-base hardfacing layer containing RE and multiple alloying was investigated. The results show that after heat preservation at 560 ℃ and ...After tempering treatment at different conditions, the tempering stability of Fe-base hardfacing layer containing RE and multiple alloying was investigated. The results show that after heat preservation at 560 ℃ and tempering for 4 h the hardness value of Fe-base hardfacing layer containing RE and multiple alloying can reach HRC57; By repeatedly heating circle 700 ℃17 ℃ for 150 times, the hardness value of Fe-base hardfacing layer can reach HRC43, tempering stability is higher and causes the secondary hardening phenomenon. Reasons for higher tempering stability of Fe-base hardfacing layer were analyzed by means of metallographic, XRD, TEM and EDS.展开更多
This study comprehensively explores the correlation between microstructural evolution/surface characteristics and the dual functional performance of soft magnetism and catalytic degradation in Fe-based amorphous alloy...This study comprehensively explores the correlation between microstructural evolution/surface characteristics and the dual functional performance of soft magnetism and catalytic degradation in Fe-based amorphous alloys.The magnetic properties and methyl orange(MO)degradation performance of as-spun Fe_(80)P_(5)C_(15-x)B_(x) ribbons(x=0 and 10),produced at various roller speeds(R_(s))ranging from 10 to 45 s^(-1),were carefully analyzed.The soft magnetic properties and MO degradation performance of the ribbons are synergistically enhanced with increasing Rs and boron(B)doping.This enhancement can be ascribed to matrix modification,specifically the formation of the Fe_(23)(C,B)_(6) crystalline phase and a fully glassy phase,along with the formation of a self-spalling oxide layer on the surface.Specifically,the kinetic rate constant(k)for all ribbons shows a clear positive correlation with both saturation magnetization(B_(s))and logarithmic magnetic permeability at the frequency of 1000 kHz(lnμhf),highlighting the role of magnetic-catalytic synergy in accelerating the reaction rate.This work presents a novel strategy for designing Fe-based amorphous alloys with integrated soft magnetic and catalytic functionalities,offering promising potential for application in reusable wastewater treatment systems.展开更多
基金supported by the National Natural Science Foundation of China(no.52374301)the Open Project of Guangxi Key Laboratory of Electrochemical Energy Materials(no.GXUEEM2024001)+2 种基金the Hebei Provincial Natural Science Foundation(no.E2024501010)the Shijiazhuang Basic Research Project(no.241790667A)the Performance subsidy fund for Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province(no.22567627H)。
文摘Sodium-ion batteries(SIBs)have the advantages of environmental friendliness,cost-effectiveness,and high energy density,which are considered one of the most promising candidates for lithium-ion batteries(LIBs).The cathode materials influence the cost and energy output of SIBs.Therefore,the development of advanced cathode materials is crucial for the practical application of SIBs.Among various cathode materials,layered transition metal oxides(LTMOs)have received widespread attention owing to their straightforward preparation,abundant availability,and cost-competitiveness.Notably,layered Fe-based oxide cathodes are deemed to be one of the most promising candidates for the lowest price and easy-to-improve performance.Nevertheless,the challenges such as severe phase transitions,sluggish diffusion kinetics and interfacial degradation pose significant hurdles in achieving high-performance cathodes for SIBs.This review first briefly outlines the classification of layered structures and the working principle of layered oxides.Then,recent advances in modification strategies employed to address current issues with layered iron-based oxide cathodes are systematically reviewed,including ion doping,biphasic engineering and surface modification.Furthermore,the review not only outlines the prospects and development directions for layered Fe-based oxide cathodes but also provides novel insights and directions for future research endeavors for SIBs.
文摘After different heat treatment processes, the metal compound, the microstructure and the hardness of the C-Cr-W- Mo-V-RE Fe-based hardfacing layers are investigated by means of metallographic microscope, X-ray diffraction （ XRD ）, energy dispersive spectrum（ EDS ）, transmission electron microscope（TEM） and hardness tester. The results show that the hardfacing layers have higher tempering stability and secondary hardening property. After quenching at 820 ℃ ,the hardness value（ HRC37 ） and the microstructure of the layers are similar to that normalized at 820 - 1 000 ℃. The tempering stability and the hardness increases with increasing quench temperature, which is attributed to the amount of the alloy element in the matrix. These results are very helpful for improving the mechanical properties of the hardfacing layers.
文摘After tempering treatment at different conditions, the tempering stability of Fe-base hardfacing layer containing RE and multiple alloying was investigated. The results show that after heat preservation at 560 ℃ and tempering for 4 h the hardness value of Fe-base hardfacing layer containing RE and multiple alloying can reach HRC57; By repeatedly heating circle 700 ℃17 ℃ for 150 times, the hardness value of Fe-base hardfacing layer can reach HRC43, tempering stability is higher and causes the secondary hardening phenomenon. Reasons for higher tempering stability of Fe-base hardfacing layer were analyzed by means of metallographic, XRD, TEM and EDS.
基金supported by the Key R&D Program of Shandong Province,China(Grant Nos.2025CXGC010404,2023CXGC010308,2022CXGC020308 and 2021ZLGX01)the Key Research and Development Program,China(Grant No.2022YFB2404100)+1 种基金the National Natural Science Foundation,China(Grant Nos.51971093,52171158 and 52101196)the Open Project Program of Shandong Marine Aerospace Equipment Technological Innovation Center(Ludong University)(Grant No.MAETIC2021-11).
文摘This study comprehensively explores the correlation between microstructural evolution/surface characteristics and the dual functional performance of soft magnetism and catalytic degradation in Fe-based amorphous alloys.The magnetic properties and methyl orange(MO)degradation performance of as-spun Fe_(80)P_(5)C_(15-x)B_(x) ribbons(x=0 and 10),produced at various roller speeds(R_(s))ranging from 10 to 45 s^(-1),were carefully analyzed.The soft magnetic properties and MO degradation performance of the ribbons are synergistically enhanced with increasing Rs and boron(B)doping.This enhancement can be ascribed to matrix modification,specifically the formation of the Fe_(23)(C,B)_(6) crystalline phase and a fully glassy phase,along with the formation of a self-spalling oxide layer on the surface.Specifically,the kinetic rate constant(k)for all ribbons shows a clear positive correlation with both saturation magnetization(B_(s))and logarithmic magnetic permeability at the frequency of 1000 kHz(lnμhf),highlighting the role of magnetic-catalytic synergy in accelerating the reaction rate.This work presents a novel strategy for designing Fe-based amorphous alloys with integrated soft magnetic and catalytic functionalities,offering promising potential for application in reusable wastewater treatment systems.
