摘要：As a promising anode material candidate for sodium-ion batteries,antimony(Sb)has attracted enormous research interest due to its high specific capacity and low sodiation ***,its dramatic volume expansion upon sodiation adversely affects its cycle *** have developed an oxidation-coating-reduction strategy for fabricating yolk-shell Sb@C rods from commercially available Sb *** particular,the thermal reduction of vaporized Sb_(2)O_(3) generates densely distributed Sb single atoms and clusters on the carbon *** sodiation process of the Sb@C sample was recorded through in situ transmission electron *** expansion of Sb particles was observed,and it was also revealed that the carbon shell could deform with the expanded Sb *** the intuitively understood advantage that internal voids can provide space for expansion of internal active materials,the deformability of carbon shells can add further ability to withstand the volume *** two structural merits of the yolk-shell construction enable the Sb@C material to deliver an enhanced cycle *** reversible capacity exceeds 620 mA h g^(−1) at 0.1C,with an initial coulombic efficiency of up to 84.9%,and about 95%of the capacity in the charging voltage profile is delivered below 1.0 V ***+/*** performance metrics are very promising for potential practical applications.

摘要：As one of the most promising next-generation energy storage devices,the lithium-metal battery has been extensively ***,safety issues and undesired lithium dendrite growth hinder its *** application of solid-state electrolytes has attracted increasing attention as they can solve safety issues and show great potential to inhibit the growth of lithium *** oxide(PEO)-based electrolytes are very promising due to their enhanced safety and excellent ***,they suffer from low ionic conductivity at room temperature and cannot effectively inhibit lithium dendrites at high temperatures due to the intrinsic semicrystalline properties and poor mechanical *** this work,a novel coral-like Li_(6.25)Al_(0.25)La_(3)Zr_(2)O_(12)(C-LALZO)is synthesized to serve as an active ceramic filler in *** PEO with LALZO coral(PLC)exhibits increased ionic conductivity and mechanical strength,which leads to uniform deposition/stripping of lithium *** Li symmetric cells with PLC do not cause a short circuit after cycling for 1500 h at 60℃.The assembled LiFePO_(4)/PLC/Li batteries display excellent cycling stability at both 60 and 50℃.This work reveals that the electrochemical properties of the composite electrolyte can be effectively improved by tuning the microstructure of the filler,such as the C-LALZO architecture.

摘要：The analytical model for springback in arc bending of sheet metal can serve as an excellent design *** amount of springback is considerably influenced by the geometrical and the material parameters associated with the sheet *** addition,the applied load during the bending also has a significant *** a number of numerical techniques have been used for this purpose,only few analytical models that can provide insight into the phenomenon are available.A phenomenological model for predicting the springback in arc bending was proposed based on strain as well as deformation energy based *** results of the analytical model were compared with the published experimental as well as FE results of the authors,and the agreement was found to be satisfactory.

摘要：Semiconductor heterostructures mediated by electrical conductors are very promising for Z-scheme photocatalytic water *** contrast to conventional particulate heterostructures,alternate TiO_(2)and Cu_(2)O film stripes patterned parallel on a fluorine-doped tin oxide(FTO) conductive substrate was fabricated as a model film photocatalyst to study the characteristics of the photogenerated charge transfer *** Z-scheme transfer process with an effective transport distance of up to 5 μm occurs only in regions distant from the TiO_(2)/Cu_(2)O strip edges through the FTO substrate from the *** contrast,the transfer of charge around their contact regions follows the conventional transfer process through the TiO_(2)/Cu_(2)O strip *** results indicate that the Z-scheme transfer process occurring in such a large region dominates the charge transfer processes in the TiO_(2)/FTO/Cu_(2)O pattern film ***,unlike the single component film,which is inactive for photocatalytic overall water splitting,the modified TiO_(2)/Cu_(2)O pattern film can induce photocatalytic overall water splitting at a stoichiometric H_(2)/O_(2) ratio close to 2:*** findings have significant implications in designing efficient heterostructures by employing a Z-scheme charge transfer process.

摘要：The design of highly active and stable catalysts for the oxygen evolution reaction(OER) in acidic media has become an attractive research area for the development of energy conversion and storage technologies. However, progress in this area has been limited by the poor understanding of the dynamic active structure of catalysts under realistic OER conditions. Here, an atomic Co-doped nanoporous Ru O_(2)electrocatalyst, which exhibited excellent OER activity and stability in acidic conditions, was synthesized through annealing and etching of a nanoporous Co-Ru alloy. Operando X-ray absorption spectroscopy results confirmed that the etching strategy produced abundant oxygen vacancies around the metal centers in the atomic Co-doped nanoporous Ru O_(2)electrocatalyst. These vacancies created contracted metaloxygen ligand bonds under realistic OER conditions. The dynamic structural evolution of the synthesized electrocatalyst allowed them to experience lower kinetic barriers during OER catalysis, resulting in enhanced catalytic activity and *** study also provided atomic details on the active structure of the electrocatalyst and the influence of their structural evolution on OER activity.

摘要：Efficient and economical electrocatalysts should be developed for oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)to split water for an extensive application prospect of green and clean hydrogen ***,we develop highly efficient OER and HER electrocatalysts through the scalable fabrication of Ni Fe Zn hydroxide nanosheets firmly arrayed on a hierarchical porous intermetallic Ni Zn and Ni heterojunction over nickel foam(Ni Fe Zn-OH/Ni Zn-Ni/NF).One bimodal porous Ni Zn intermetallic/Ni layer is in situ constructed on the nickel foam surface to maximize the exposure of catalytic sites and build firm Ni Fe Zn-OH nanosheets via the redox reaction with Fe Cl;.Ni Fe Zn-OH/Ni Zn-Ni/NF shows low overpotentials of?50/600 around 235/284 m V for OER and?50/600 around73/212 m V for HER,small Tafel slopes of 46.1 and41.1 m V dec^(-1),and prolonged catalytic durability in an alkaline medium because of the strong synergistic effects of Zn doping,multiple interface engineering,and integral threedimensional free-standing *** bifunctional catalysts,Ni Fe Zn-OH/Ni Zn-Ni/NF required a low electrolytic voltage of1.49 V at 20 m A cm^(-2)(1.61 V at 100 m A cm^(-2))with a sustained and stable output for 40 h during water *** work might provide insights into the exploration of low-cost and highly efficient intermetallic/multimetallic hydroxide heterostructured electrocatalysts for practical overall water splitting.

摘要：Although significant progress has been achieved in developing high energy aqueous zinc ion hybrid supercapacitors(ZHSCs),the sluggish diffusion of zinc ion(Zn^(2+))and unsatisfactory cathodes still hinder their energy density and cycling life *** work demonstrates the use of nitrogen-doped mesoporous carbon nanospheres(NMCSs)with appropriately hierarchical pore distribution and enhanced zinc ion storage capability for efficient Zn^(2+)*** asprepared aqueous ZHSC delivers a significant specific capacity of 157.8 mA h g^(-1),a maximum energy density of 126.2 W h kg^(-1) at 0.2 A g^(-1),and an ultra-high power density of 39.9 kW kg^(-1) with a quick charge time of 5.5 ***,the ZHSC demonstrates an ultra-long cycling life span of 50,000 cycles with an exciting capacity retention of 96.2%.More interestingly,a new type of planar ZHSC is fabricated with outstanding low-temperature electrochemical performance,landmark volumetric energy density of 31.6 mW h cm^(-3),and excellent serial and parallel *** investigation verifies that the superior electrochemical capability is due to the synergistic effect of cation and anion adsorption,as well as the reversible chemical adsorption of *** work provides not only an innovative strategy to construct and develop novel high-performance ZHSCs,but also a deeper understanding of the electrochemical characteristics of ZHSCs.

摘要：Coupled with anionic and cationic redox chemistry,Li-rich/excess cathode materials are prospective high-energy-density candidates for the next-generation Li-ion ***,irreversible lattice oxygen loss would exacerbate irreversible transition metal migration,resulting in a drastic voltage decay and capacity ***,a metastable layered Li-excess cathode material,T2-type Li_(0.72)[Li_(0.12)Ni_(0.36)Mn_(0.52)]O_(2),was developed,in which both oxygen stacking arrangement and Li coordination environment fundamentally differ from that in conventional O3-type layered *** means of the reversible Li migration processes and structural evolutions,not only can voltage decay be effectively restrained,but also excellent capacity retention can be achieved upon long-term ***,irreversible/reversible anionic/cationic redox activities have been well assigned and quantified by various in/ex-situ spectroscopic techniques,further clarifying the charge compensation mechanism associated with(de)*** findings of the novel T2 structure with the enhanced anionic redox stability will provide a new scope for the development of high-energy-density Li-rich cathode materials.

摘要：区别于在三维拓扑绝缘体引入磁性的设计思路,在二维铁磁材料中引入拓扑特性是实现量子反常霍尔效应(QAHE)的一种新途径.最近实验成功制备的二维铁磁绝缘体为实现该效应提供了新的契机.本文基于密度泛函理论的第一性原理计算,设计了一个在过渡金属三元硫属化合物Cr2A2X6(其中A=Si,Ge,Sn;X=S,Se,Te)中实现QAHE的普适规则.该设计原则是,通过适当的表面修饰可将二维非拓扑的磁性绝缘体转变为量子反常霍尔体系.以硅烯修饰的Cr2Sn2Se6(Si/Cr2Sn2Se6)为例,计算发现Cr2Sn2Se6单层的居里温度可提高至92 K.具体的电子能带和拓扑性质计算发现,Si/Cr2Sn2Se6异质结存在约30 meV的拓扑非平庸带隙,即该体系中可以实现QAHE.进一步的低能有效模型分析表明,Si/Cr2Sn2Se6的拓扑特性是由Cr2A2X6六角晶格中的Cr原子贡献的.此外,还发现其他Cr2A2X6通过表面修饰也可以实现QAHE.以上研究结果证实了本文方案的普适性,其为实现高温QAHE提供了新的理论指导.

摘要：In this paper, we present the design of multilayer microwave absorbers comprised of Co Fe alloy nano-particles and nano-flakes as fillers. The thickness of the unite layer is optimized by using the Genetic Algorithm. Efficient microwave absorptions over a wide frequency band and a range of incident angles are achieved by using multilayer absorbers. We show that the absorbers are effective not only for a planar surface but also for arbitrarily shaped objects as well.