Hydrogen energy has gained widespread recognition for its environmentally friendly nature,high energy density and abundant resources,making it a promising energy carrier for a sustainable and clean energy society.Howe...Hydrogen energy has gained widespread recognition for its environmentally friendly nature,high energy density and abundant resources,making it a promising energy carrier for a sustainable and clean energy society.However,safe and efficient hydrogen storage remains a significant challenge due to its inherent leakiness and flammability.To overcome these challenges,alloys featuring body-centered cubic(BCC)structures have emerged as compelling candidates for hydrogen storage,owing to their exceptional capacity to achieve high-density hydrogen storage up to 3.8 wt%at ambient temperatures.Nonetheless,their practical application faces limited dehydriding capacity,complex activation processes,high costs and poor cyclic stability.Various modification strategies have been explored to overcome these limitations,including lattice regulation,element substitution,rare earth doping and heat treatment.This progress report presents an overview of the previous advancements to enhance five crucial aspects(high-V,medium-V,low-V,V-free and high-entropy alloys)in composition design and hydrogen storage properties within BCC-structured alloys.Subsequently,an in-depth analysis is conducted to examine the relationship between crystal structures and hydrogen storage properties specific to BCC-structured alloys,covering aspects such as composition,crystal structure,hydrogen storage capacity,enthalpy and entropy.Furthermore,this review explores current challenges in this field and outlines directions for future research.These insights provide valuable guidance for the design of innovative and cost-effective hydrogen storage alloys.展开更多
Efficient,safe,and economical hydrogen storage technology is vital for hydrogen’s broad use as an energy carrier,with V-based BCC alloys standing out for their high theoretical storage capacity.However,the high cost ...Efficient,safe,and economical hydrogen storage technology is vital for hydrogen’s broad use as an energy carrier,with V-based BCC alloys standing out for their high theoretical storage capacity.However,the high cost of V has restricted their practical application.In this work,a cost-effective Ti–Cr–(Fe V80)alloy was successfully synthesized through a pre-refinement process involving the addition of Y/Zr to the Fe V80 alloy.The resulting Ti_(27)Cr_(27)(Fe V80+Y)_(46)alloy exhibited an effective dehydriding capacity of 2.3 wt%,with a capacity retention rate of 97.2%after 200 cycles.Through the analysis of HSC Chemistry 6.0 software and backscattered electron(BSE),it has been discovered that the prerefinement process significantly reduces the presence of Al,Si,and O impurities,leading to improved compositional uniformity.After the re-refinement,the formation of the Ti–rich phases had been notably curbed.This,along with a marked decrease in the pressure–composition–temperature(PCT)curve’s slope factor from 1.58 to 0.36,results in enhanced hydriding capacity(from 3.2 wt%to 3.7 wt%),reversible dehydriding capacity(from 2.0 wt%to 2.3 wt%),and a remarkable increase in the capacity retention rate(from 75.8%to 97.2%).The kinetics and thermodynamic properties of the alloys were calculated using the Arrhenius and Van’t Hoff equations,providing insights into their performance characteristics.The mechanism behind the alloy’s improved cyclic stability has been elucidated through an analysis of lattice distortion and X-ray photoelectron spectroscopy(XPS).These findings open new routes for the development of cost-effective Fe V80-based hydrogen storage materials.展开更多
The corrosion behavior of bulk metallic glasses(BMGs)(Fe41Co7Cr15Mo14C15B6Y2)100-xCrx(x=0,4,8,12,molar fraction,%)was investigated in1mol/L HCl aqueous solution with electrochemical tests.The electrochemical measureme...The corrosion behavior of bulk metallic glasses(BMGs)(Fe41Co7Cr15Mo14C15B6Y2)100-xCrx(x=0,4,8,12,molar fraction,%)was investigated in1mol/L HCl aqueous solution with electrochemical tests.The electrochemical measurements demonstrate that the passive current density of Fe-based amorphous alloy is reduced by about one order of magnitude,and meanwhile,the stability of passive film can be guaranteed by the Cr/Mo molar ratio.The Mott–Schottky(M–S)curves show that the passive film is the densest when the molar ratio of Cr/Mo is between1.37and1.69.X-ray photoelectron spectroscopy(XPS)analysis was performed to clarify chemical states of elements in the passive films.The results show that the corrosion resistance of the alloy is related to the molar ratio of Cr/Mo.The stability of passive film is determined by the synergistic action of Cr and Mo elements.The main component of the passive film is Cr3+oxide.When the potential is greater than0.5V(vs SCE),Mo6+ions play an important role in keeping the stability of the passive film.The appropriate molar ratio of Cr/Mo can reduce the dissolution rate of the passive film.展开更多
The V-based body-centered cubic(BCC)-type hydrogen storage alloys have attracted significant attention due to their high theoretical hydrogen storage capacity of3.80 wt%.However,their practical application faces chall...The V-based body-centered cubic(BCC)-type hydrogen storage alloys have attracted significant attention due to their high theoretical hydrogen storage capacity of3.80 wt%.However,their practical application faces challenges related to low dehydriding capacity and poor activation performance.To overcome these challenges,a BCC-type Ti-V-Cr-Mn-Mo-Ce high-entropy alloy(HEA)with an effectively dehydriding capacity of 2.5 wt% above 0.1 MPa was prepared.By introduction of Mo and conducting heat treatment,the precipitation of Ti-rich phase in HEA was successfully suppressed,resulting in improved compositional uniformity and dehydriding capacity.Consequently,the effective dehydriding capacity increased significantly from 0.60 wt% to 2.50 wt% at 65℃,surpassing that of other types of hydrogen storage alloys under the same conditions.Moreover,the addition of 1 wt%Ce enabled initial hydrogen absorption at 25℃ without the need for activation at 400℃.Furthermore,Ce doping reduced the dehydriding activation energy of the Ti-V-Cr-Mn-Mo-Ce HEA from 52.71 to 42.82 kJ·mol^(-1)Additionally,the enthalpy value of dehydrogenation decreased from 46.89 to 17.96 k J·mol^(-1),attributed to a decrease in the hysteresis factor from 0.68 to 0.52.These findings provide valuable insights for optimizing the hydrogen storage property of HEA.展开更多
基金supported by the National Key R&D Program of China(No.2022YFB3504700)the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA0400304)the Research Fund of Key Laboratory of Rare Earths,Chinese Academy of Sciences(No.E32PF00116).
文摘Hydrogen energy has gained widespread recognition for its environmentally friendly nature,high energy density and abundant resources,making it a promising energy carrier for a sustainable and clean energy society.However,safe and efficient hydrogen storage remains a significant challenge due to its inherent leakiness and flammability.To overcome these challenges,alloys featuring body-centered cubic(BCC)structures have emerged as compelling candidates for hydrogen storage,owing to their exceptional capacity to achieve high-density hydrogen storage up to 3.8 wt%at ambient temperatures.Nonetheless,their practical application faces limited dehydriding capacity,complex activation processes,high costs and poor cyclic stability.Various modification strategies have been explored to overcome these limitations,including lattice regulation,element substitution,rare earth doping and heat treatment.This progress report presents an overview of the previous advancements to enhance five crucial aspects(high-V,medium-V,low-V,V-free and high-entropy alloys)in composition design and hydrogen storage properties within BCC-structured alloys.Subsequently,an in-depth analysis is conducted to examine the relationship between crystal structures and hydrogen storage properties specific to BCC-structured alloys,covering aspects such as composition,crystal structure,hydrogen storage capacity,enthalpy and entropy.Furthermore,this review explores current challenges in this field and outlines directions for future research.These insights provide valuable guidance for the design of innovative and cost-effective hydrogen storage alloys.
基金financially supported by the National Key R&D Program of China(No.2022YFB3504700)the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA0400304)the Research Fund of Key Laboratory of Rare Earth,Chinese Academy of Sciences(No.E32PF00116)。
文摘Efficient,safe,and economical hydrogen storage technology is vital for hydrogen’s broad use as an energy carrier,with V-based BCC alloys standing out for their high theoretical storage capacity.However,the high cost of V has restricted their practical application.In this work,a cost-effective Ti–Cr–(Fe V80)alloy was successfully synthesized through a pre-refinement process involving the addition of Y/Zr to the Fe V80 alloy.The resulting Ti_(27)Cr_(27)(Fe V80+Y)_(46)alloy exhibited an effective dehydriding capacity of 2.3 wt%,with a capacity retention rate of 97.2%after 200 cycles.Through the analysis of HSC Chemistry 6.0 software and backscattered electron(BSE),it has been discovered that the prerefinement process significantly reduces the presence of Al,Si,and O impurities,leading to improved compositional uniformity.After the re-refinement,the formation of the Ti–rich phases had been notably curbed.This,along with a marked decrease in the pressure–composition–temperature(PCT)curve’s slope factor from 1.58 to 0.36,results in enhanced hydriding capacity(from 3.2 wt%to 3.7 wt%),reversible dehydriding capacity(from 2.0 wt%to 2.3 wt%),and a remarkable increase in the capacity retention rate(from 75.8%to 97.2%).The kinetics and thermodynamic properties of the alloys were calculated using the Arrhenius and Van’t Hoff equations,providing insights into their performance characteristics.The mechanism behind the alloy’s improved cyclic stability has been elucidated through an analysis of lattice distortion and X-ray photoelectron spectroscopy(XPS).These findings open new routes for the development of cost-effective Fe V80-based hydrogen storage materials.
基金Project(51261021)supported by the National Natural Science Foundation of ChinaProject(KJLD13056)supported by the Science and Technology Landing Plan of Jiangxi Province,China
文摘The corrosion behavior of bulk metallic glasses(BMGs)(Fe41Co7Cr15Mo14C15B6Y2)100-xCrx(x=0,4,8,12,molar fraction,%)was investigated in1mol/L HCl aqueous solution with electrochemical tests.The electrochemical measurements demonstrate that the passive current density of Fe-based amorphous alloy is reduced by about one order of magnitude,and meanwhile,the stability of passive film can be guaranteed by the Cr/Mo molar ratio.The Mott–Schottky(M–S)curves show that the passive film is the densest when the molar ratio of Cr/Mo is between1.37and1.69.X-ray photoelectron spectroscopy(XPS)analysis was performed to clarify chemical states of elements in the passive films.The results show that the corrosion resistance of the alloy is related to the molar ratio of Cr/Mo.The stability of passive film is determined by the synergistic action of Cr and Mo elements.The main component of the passive film is Cr3+oxide.When the potential is greater than0.5V(vs SCE),Mo6+ions play an important role in keeping the stability of the passive film.The appropriate molar ratio of Cr/Mo can reduce the dissolution rate of the passive film.
基金supported by National Key R&D Program of China(No.2022YFB3504700)the National Natural Science Foundation of China(No.92061125)Jiangxi Natural Science Foundation(No.20212ACB213009)。
文摘The V-based body-centered cubic(BCC)-type hydrogen storage alloys have attracted significant attention due to their high theoretical hydrogen storage capacity of3.80 wt%.However,their practical application faces challenges related to low dehydriding capacity and poor activation performance.To overcome these challenges,a BCC-type Ti-V-Cr-Mn-Mo-Ce high-entropy alloy(HEA)with an effectively dehydriding capacity of 2.5 wt% above 0.1 MPa was prepared.By introduction of Mo and conducting heat treatment,the precipitation of Ti-rich phase in HEA was successfully suppressed,resulting in improved compositional uniformity and dehydriding capacity.Consequently,the effective dehydriding capacity increased significantly from 0.60 wt% to 2.50 wt% at 65℃,surpassing that of other types of hydrogen storage alloys under the same conditions.Moreover,the addition of 1 wt%Ce enabled initial hydrogen absorption at 25℃ without the need for activation at 400℃.Furthermore,Ce doping reduced the dehydriding activation energy of the Ti-V-Cr-Mn-Mo-Ce HEA from 52.71 to 42.82 kJ·mol^(-1)Additionally,the enthalpy value of dehydrogenation decreased from 46.89 to 17.96 k J·mol^(-1),attributed to a decrease in the hysteresis factor from 0.68 to 0.52.These findings provide valuable insights for optimizing the hydrogen storage property of HEA.
