Solar‐driven thermochemical water splitting represents one efficient route to the generation of H2as a clean and renewable fuel.Due to their outstanding catalytic abilities and promising solar fuel production capacit...Solar‐driven thermochemical water splitting represents one efficient route to the generation of H2as a clean and renewable fuel.Due to their outstanding catalytic abilities and promising solar fuel production capacities,perovskite‐type redox catalysts have attracted significant attention in this regard.In the present study,the perovskite series La1‐xCaxMn1‐yAlyO3(x,y=0.2,0.4,0.6,or0.8)was fabricated using a modified Pechini method and comprehensively investigated to determine the applicability of these materials to solar H2production via two‐step thermochemical water splitting.The thermochemical redox behaviors of these perovskites were optimized by doping at either the A(Ca)or B(Al)sites over a broad range of substitution values,from0.2to0.8.Through this doping,a highly efficient perovskite(La0.6Ca0.4Mn0.6Al0.4O3)was developed,which yielded a remarkable H2production rate of429μmol/g during two‐step thermochemical H2O splitting,going between1400and1000°C.Moreover,the performance of the optimized perovskite was found to be eight times higher than that of the benchmark catalyst CeO2under the same experimental conditions.Furthermore,these perovskites also showed impressive catalytic stability during two‐step thermochemical cycling tests.These newly developed La1‐xCaxMn1‐yAlyO3redox catalysts appear to have great potential for future practical applications in thermochemical solar fuel production.展开更多
The electronic structure and magnetism of compound Nd\-2Fe 17 N\-3 has been studied with MS_Xα method. It was found that there are negative exchange couplings between Fe(f) and Fe(c) atoms in Nd\-2Fe 17 N x compounds...The electronic structure and magnetism of compound Nd\-2Fe 17 N\-3 has been studied with MS_Xα method. It was found that there are negative exchange couplings between Fe(f) and Fe(c) atoms in Nd\-2Fe 17 N x compounds. The interstitial N atoms make the unit cell volume of the compounds increase a little, and hence the strength of negative exchange coupling decreases.展开更多
The transport of ablated particles produced by single pulsed-laser ablation is simulated via Monte Carlo method. The pressure ranges of velocity splitting of ablated particles in different inert gases are investigated...The transport of ablated particles produced by single pulsed-laser ablation is simulated via Monte Carlo method. The pressure ranges of velocity splitting of ablated particles in different inert gases are investigated. The result shows that the range of velocity splitting decreases with the atomic mass of the ambient gas increasing. The ambient gas whose atomic mass is more than that of Kr cannot induce the velocity splitting of ablated particles. The results are explained by the underdamping model and the inertia flow model.展开更多
A new photocatalyst,PdS@NH_(2)-MIL-125(Ti)@ZnS(PdS/M125/ZnS)heterojunction is fabricated for photo-catalytic H_(2)generation for the first time,where PdS nanoparticles are anchored in the pore of M125 by utilizing its...A new photocatalyst,PdS@NH_(2)-MIL-125(Ti)@ZnS(PdS/M125/ZnS)heterojunction is fabricated for photo-catalytic H_(2)generation for the first time,where PdS nanoparticles are anchored in the pore of M125 by utilizing its confinement effect,and the ZnS is closely wrapped on the surfaces of the MOFs.The optimal photocatalyst exhibits a significantly enhanced H_(2)generation rate of 1164.2μmol/g/h,while the pure M125 only displays a H_(2)generation rate of 16.7μmol/g/h.The resultant improvement can be ascribed to the following comprehensive advantages.The hierarchical structure built by PdS,M125,and ZnS can form lots of intimate interfaces,offer abundant sites for reaction,and smooth channels for charge carri-ers due to the porous characteristics of MOFs.Moreover,M125 and ZnS with inner defect levels form an analogous type-II heterojunction assisted by PdS co-catalyst,which greatly promotes charge separation.This work may supply a new avenue to design MOFs photocatalysts for energy conversion.展开更多
We observe the Autler-Townes splitting effect in a △-type quantum three-level system, using the lowest three levels of a SQUID-type Al/AlOx/Al transmon qubit embedded in a three-dimensional copper microwave cavity. A...We observe the Autler-Townes splitting effect in a △-type quantum three-level system, using the lowest three levels of a SQUID-type Al/AlOx/Al transmon qubit embedded in a three-dimensional copper microwave cavity. A control tone at different strengths is applied in resonance with the transition between the first and second excited states, while the spectra between each of them and the ground state are probed by another microwave tone. The experimental result shows the difference between the two spectra, and fits well with the Lindblad master equation model.展开更多
Kellogg gave a version of the Peaceman-Radford method. In this paper, we introduce a SSOR iteration method which uses Kellogg’s method. The new algorithm has some advantages over the traditional SSOR algorithm. A Cyc...Kellogg gave a version of the Peaceman-Radford method. In this paper, we introduce a SSOR iteration method which uses Kellogg’s method. The new algorithm has some advantages over the traditional SSOR algorithm. A Cyclic Reduction algorithm is introduced via a decoupling in Kellogg’s method.展开更多
采用一步滴涂法在掺氟二氧化锡(FTO)导电玻璃上制备了Bi_(1-x)Fe_(x)VO_4(x=0,0.05,0.10,0.25,0.40)薄膜,表征了其结构、形貌、光学以及光电化学方面的性质.结果表明,掺入Fe后Bi_(1-x)Fe_(x)VO_(4)薄膜的光电流密度与BiVO_(4)薄膜相比...采用一步滴涂法在掺氟二氧化锡(FTO)导电玻璃上制备了Bi_(1-x)Fe_(x)VO_4(x=0,0.05,0.10,0.25,0.40)薄膜,表征了其结构、形貌、光学以及光电化学方面的性质.结果表明,掺入Fe后Bi_(1-x)Fe_(x)VO_(4)薄膜的光电流密度与BiVO_(4)薄膜相比均有所提高,其中25%Fe-BiVO_(4)薄膜表现出最优的光电化学性能.在0.1 mol/L磷酸缓冲溶液(pH=7.0)中,1.23 V(vs.RHE)电势下25%Fe-BiVO_(4)薄膜的光电流密度为0.50 m A/cm~2,与BiVO_(4)薄膜的0.15m A/cm^(2)相比提高了3倍多.结合X射线衍射(XRD)、拉曼光谱(Raman)和X射线光电子能谱(XPS)表征结果证实Fe~(3+)以FeVO_(4)的形式存在于Bi_(1-x)Fe_(x)VO_(4)薄膜中,形成了BiVO_(4)/FeVO_(4)复合物薄膜.紫外-可见光谱(UV-Vis)结果显示,所有Bi_(1-x)Fe_(x)VO_4薄膜的禁带宽度均为2.4~2.5 e V.25%Fe-BiVO_(4)薄膜光电化学性能的提升主要归因于光生载流子转移效率(η_(trans))和分离效率(η_(sep))的提高.能级结构图表明,BiVO_(4)和FeVO_(4)之间可以形成TypeⅡ型能级结构排列,可以促进光生载流子的分离与转移,是25%Fe-BiVO_(4)薄膜光电化学性能提升的内在机理.展开更多
Assisted by multipartite entanglement, Quantum information may be split so that the original qubit can be reconstructed if and only if the recipients cooperate. This paper proposes an experimentally feasible scheme fo...Assisted by multipartite entanglement, Quantum information may be split so that the original qubit can be reconstructed if and only if the recipients cooperate. This paper proposes an experimentally feasible scheme for splitting quantum information via W-type entangled states in cavity QED systems, where three-level Rydberg atoms interact with nonresonant cavities. Since W-type states are used as the quantum channel and the cavities are only virtually excited, the scheme is easy to implement and robust against decoherence, and the dependence on the quality factor of the cavities is greatly reduced.展开更多
基金supported by the Australian Research Council(FT120100913)the National Natural Science Foundation of China(51372248,51432009)~~
文摘Solar‐driven thermochemical water splitting represents one efficient route to the generation of H2as a clean and renewable fuel.Due to their outstanding catalytic abilities and promising solar fuel production capacities,perovskite‐type redox catalysts have attracted significant attention in this regard.In the present study,the perovskite series La1‐xCaxMn1‐yAlyO3(x,y=0.2,0.4,0.6,or0.8)was fabricated using a modified Pechini method and comprehensively investigated to determine the applicability of these materials to solar H2production via two‐step thermochemical water splitting.The thermochemical redox behaviors of these perovskites were optimized by doping at either the A(Ca)or B(Al)sites over a broad range of substitution values,from0.2to0.8.Through this doping,a highly efficient perovskite(La0.6Ca0.4Mn0.6Al0.4O3)was developed,which yielded a remarkable H2production rate of429μmol/g during two‐step thermochemical H2O splitting,going between1400and1000°C.Moreover,the performance of the optimized perovskite was found to be eight times higher than that of the benchmark catalyst CeO2under the same experimental conditions.Furthermore,these perovskites also showed impressive catalytic stability during two‐step thermochemical cycling tests.These newly developed La1‐xCaxMn1‐yAlyO3redox catalysts appear to have great potential for future practical applications in thermochemical solar fuel production.
文摘The electronic structure and magnetism of compound Nd\-2Fe 17 N\-3 has been studied with MS_Xα method. It was found that there are negative exchange couplings between Fe(f) and Fe(c) atoms in Nd\-2Fe 17 N x compounds. The interstitial N atoms make the unit cell volume of the compounds increase a little, and hence the strength of negative exchange coupling decreases.
基金supported by the National Basic Research Program of China(Grant No.2011CB612305)the Natural Science Foundation of Hebei Province,China(Grant Nos.E2012201035 and E2011201134)
文摘The transport of ablated particles produced by single pulsed-laser ablation is simulated via Monte Carlo method. The pressure ranges of velocity splitting of ablated particles in different inert gases are investigated. The result shows that the range of velocity splitting decreases with the atomic mass of the ambient gas increasing. The ambient gas whose atomic mass is more than that of Kr cannot induce the velocity splitting of ablated particles. The results are explained by the underdamping model and the inertia flow model.
基金This work was financially supported by the Guangdong Basic and Applied Basic Research Foundation(No.207079374034)the State Key Laboratory of Solidification Processing(No.2021-BJ-04)the State Key Laboratory for Mechanical Behavior of Materials(No.20222421)。
文摘A new photocatalyst,PdS@NH_(2)-MIL-125(Ti)@ZnS(PdS/M125/ZnS)heterojunction is fabricated for photo-catalytic H_(2)generation for the first time,where PdS nanoparticles are anchored in the pore of M125 by utilizing its confinement effect,and the ZnS is closely wrapped on the surfaces of the MOFs.The optimal photocatalyst exhibits a significantly enhanced H_(2)generation rate of 1164.2μmol/g/h,while the pure M125 only displays a H_(2)generation rate of 16.7μmol/g/h.The resultant improvement can be ascribed to the following comprehensive advantages.The hierarchical structure built by PdS,M125,and ZnS can form lots of intimate interfaces,offer abundant sites for reaction,and smooth channels for charge carri-ers due to the porous characteristics of MOFs.Moreover,M125 and ZnS with inner defect levels form an analogous type-II heterojunction assisted by PdS co-catalyst,which greatly promotes charge separation.This work may supply a new avenue to design MOFs photocatalysts for energy conversion.
基金Supported by the National Basic Research Program of China under Grant Nos 2011CBA00304,2014CB848700 and 2014CB921401
文摘We observe the Autler-Townes splitting effect in a △-type quantum three-level system, using the lowest three levels of a SQUID-type Al/AlOx/Al transmon qubit embedded in a three-dimensional copper microwave cavity. A control tone at different strengths is applied in resonance with the transition between the first and second excited states, while the spectra between each of them and the ground state are probed by another microwave tone. The experimental result shows the difference between the two spectra, and fits well with the Lindblad master equation model.
文摘Kellogg gave a version of the Peaceman-Radford method. In this paper, we introduce a SSOR iteration method which uses Kellogg’s method. The new algorithm has some advantages over the traditional SSOR algorithm. A Cyclic Reduction algorithm is introduced via a decoupling in Kellogg’s method.
文摘采用一步滴涂法在掺氟二氧化锡(FTO)导电玻璃上制备了Bi_(1-x)Fe_(x)VO_4(x=0,0.05,0.10,0.25,0.40)薄膜,表征了其结构、形貌、光学以及光电化学方面的性质.结果表明,掺入Fe后Bi_(1-x)Fe_(x)VO_(4)薄膜的光电流密度与BiVO_(4)薄膜相比均有所提高,其中25%Fe-BiVO_(4)薄膜表现出最优的光电化学性能.在0.1 mol/L磷酸缓冲溶液(pH=7.0)中,1.23 V(vs.RHE)电势下25%Fe-BiVO_(4)薄膜的光电流密度为0.50 m A/cm~2,与BiVO_(4)薄膜的0.15m A/cm^(2)相比提高了3倍多.结合X射线衍射(XRD)、拉曼光谱(Raman)和X射线光电子能谱(XPS)表征结果证实Fe~(3+)以FeVO_(4)的形式存在于Bi_(1-x)Fe_(x)VO_(4)薄膜中,形成了BiVO_(4)/FeVO_(4)复合物薄膜.紫外-可见光谱(UV-Vis)结果显示,所有Bi_(1-x)Fe_(x)VO_4薄膜的禁带宽度均为2.4~2.5 e V.25%Fe-BiVO_(4)薄膜光电化学性能的提升主要归因于光生载流子转移效率(η_(trans))和分离效率(η_(sep))的提高.能级结构图表明,BiVO_(4)和FeVO_(4)之间可以形成TypeⅡ型能级结构排列,可以促进光生载流子的分离与转移,是25%Fe-BiVO_(4)薄膜光电化学性能提升的内在机理.
基金Project supported by the National Natural Science Foundation of China (Grant No 60677044)the Funds for Introduced Talent of Ocean University of China
文摘Assisted by multipartite entanglement, Quantum information may be split so that the original qubit can be reconstructed if and only if the recipients cooperate. This paper proposes an experimentally feasible scheme for splitting quantum information via W-type entangled states in cavity QED systems, where three-level Rydberg atoms interact with nonresonant cavities. Since W-type states are used as the quantum channel and the cavities are only virtually excited, the scheme is easy to implement and robust against decoherence, and the dependence on the quality factor of the cavities is greatly reduced.
