Subjects -> METALLURGY (Total: 58 journals)
Showing 1 - 10 of 10 Journals sorted alphabetically
Acta Metallurgica Slovaca     Open Access  
Advanced Device Materials     Open Access   (Followers: 3)
American Journal of Fluid Dynamics     Open Access   (Followers: 48)
Archives of Metallurgy and Materials     Open Access   (Followers: 9)
Asian Journal of Materials Science     Open Access   (Followers: 5)
Canadian Metallurgical Quarterly     Hybrid Journal   (Followers: 20)
Complex Metals     Open Access   (Followers: 2)
Corrosion Communications     Open Access  
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 19)
Handbook of Magnetic Materials     Full-text available via subscription   (Followers: 2)
Indian Journal of Engineering and Materials Sciences (IJEMS)     Open Access   (Followers: 10)
International Journal of Metallurgy and Alloys     Full-text available via subscription   (Followers: 3)
International Journal of Metals     Open Access   (Followers: 6)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 8)
International Journal of Mining and Geo-Engineering     Open Access  
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 4)
ISIJ International - Iron and Steel Institute of Japan     Full-text available via subscription   (Followers: 23)
JOM Journal of the Minerals, Metals and Materials Society     Hybrid Journal   (Followers: 32)
Journal of Advanced Joining Processes     Open Access  
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of Cluster Science     Hybrid Journal  
Journal of Iron and Steel Research International     Hybrid Journal   (Followers: 7)
Journal of Materials & Metallurgical Engineering     Full-text available via subscription   (Followers: 1)
Journal of Materials Processing Technology     Hybrid Journal   (Followers: 19)
Journal of Metallurgical Engineering     Open Access   (Followers: 2)
Journal of Sustainable Metallurgy     Hybrid Journal   (Followers: 3)
Materials Science and Metallurgy Engineering     Open Access   (Followers: 7)
Metallurgical and Materials Engineering     Open Access  
Metallurgical and Materials Transactions A     Hybrid Journal   (Followers: 41)
Metallurgical and Materials Transactions B     Hybrid Journal   (Followers: 30)
Metallurgical and Materials Transactions E     Full-text available via subscription   (Followers: 2)
Metallurgical Research & Technology     Full-text available via subscription  
Metallurgical Research and Technology     Full-text available via subscription   (Followers: 6)
Metallurgy and Foundry Engineering     Open Access   (Followers: 1)
Mining, Metallurgy & Exploration     Hybrid Journal  
Powder Diffraction     Full-text available via subscription   (Followers: 1)
Powder Metallurgy     Hybrid Journal   (Followers: 33)
Powder Metallurgy and Metal Ceramics     Hybrid Journal   (Followers: 7)
Powder Metallurgy Progress     Open Access   (Followers: 5)
Rare Metals     Hybrid Journal   (Followers: 2)
Revista de Metalurgia     Open Access  
Revista del Instituto de Investigación de la Facultad de Ingeniería Geológica, Minera, Metalurgica y Geográfica     Open Access  
Revista Remetallica     Open Access  
Russian Metallurgy (Metally)     Full-text available via subscription   (Followers: 4)
Science and Technology of Welding and Joining     Hybrid Journal   (Followers: 4)
Soldering & Surface Mount Technology     Hybrid Journal   (Followers: 1)
Stainless Steel World     Full-text available via subscription   (Followers: 17)
Transactions of the IMF     Hybrid Journal   (Followers: 14)
Transactions of the Indian Institute of Metals     Hybrid Journal   (Followers: 4)
Tungsten     Hybrid Journal  
Universal Journal of Materials Science     Open Access   (Followers: 1)
Welding in the World     Hybrid Journal   (Followers: 4)
Welding International     Hybrid Journal   (Followers: 7)
Вісник Приазовського Державного Технічного Університету. Серія: Технічні науки     Open Access  
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Rare Metals
Journal Prestige (SJR): 0.454
Citation Impact (citeScore): 1
Number of Followers: 2  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1001-0521 - ISSN (Online) 1867-7185
Published by Springer-Verlag Homepage  [2469 journals]
  • Sub-micron Co–Al2O3 composite powders prepared by room-temperature
           ultrasonic-assisted electroless plating

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      Abstract: Abstract Sub-micron Co–Al2O3 composite powders were synthesized by ultrasonic-assisted electroless plating process at room temperature with a one-step activating method pretreatment. The effect of process parameters on plating rate, Co content, and the uniformity of cobalt layer was analyzed by transmission electron microscopy (TEM). The results show that as the initial pH values of plating bath increase, the plating rate increases. The plating rate declines as the load increases when the load of powders is less than 12 g·L−1, but increases when the load is greater than 12 g·L−1. The relative Co content of the Co–Al2O3 powder declines with the powder load increasing.
      PubDate: 2022-06-01
       
  • Spherical modification of tungsten powder by particle composite system

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      Abstract: Abstract Owing to contradiction between increasing demand of spherical tungsten powder and limitation of traditional manufacturing technology, a novel preparation method was developed to sphericize the polygonal tungsten powder by means of modification of particle composite system. Tungsten powder particles were modified by particle composite system, and detailed characterization by scanning electron microscopy (SEM) was studied. Particle size distribution and function mechanism were analyzed, and the internal relationship between average diameter and processing time was discussed. The results show that the spherical tungsten powder with an average diameter of 6.41 μm is obtained from polyhedral tungsten powder with an average diameter of 7.50 μm. The spherical effect could be achieved (sharp edge angles of particles are rounded off and reshaped) when the processing time is over 30 min. The relationship between average diameter (d) and processing time can be described by the exponential decay model, which provides a good interpretation for the process of modification. The relationship between them can be expressed by the equation d = 1.87406exp(−x/8.92718) + 6.4182. The proposed method could readily enable large-scale production of spherical tungsten powder.
      PubDate: 2022-06-01
       
  • An analysis of F-doping in Li-rich cathodes

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      Abstract: Li-rich materials, due to their high capacity (> 250 mAh·g−1), have recently been considered as an alternative to the current generation of cathode materials for Li-ion batteries (LIBs). However, their inferior cycling stability limits their practical applicability. Doping is a common technique to solve this problem. However, anion doping remains relatively underexplored. Fluorine (F) is one of the most effective anion dopants owning to the improved capacity, cycling stability, and rate performance in batteries. The explanations and experimental results, however, vary significantly from study to study. Herein, we find that bulk F-doping significantly improves both rate performance and cycling stability, likely driven by charge compensation and greater electronegativity. Additionally, bulk F-doping occasionally improves capacity via enhanced activation and occasionally decreases capacity by preventing activation from occurring. Surface F-doping has similar effects to bulk F-doping on capacity and stability, while significantly hindering the rate performance. Furthermore, the improvements in surface-doped materials do not appear to be a result of specific surface modification, and instead can be ascribed to the effect of fluorine on the near-surface bulk material. Greater understanding of fluorine’s influence on activation, in particular, is required to unlock the full potential of synergistic cation/anion co-doping. Graphical abstract
      PubDate: 2022-06-01
       
  • Constructing Z-scheme β-Bi2O3/ZrO2 heterojunctions with 3D mesoporous
           SiO2 nanospheres for efficient antibiotic remediation via synergistic
           adsorption and photocatalysis

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      Abstract: A series of Z-scheme β-Bi2O3/ZrO2 heterojunction composites containing three-dimensional (3D) mesoporous silica nanospheres (MSNs) were synthesized as efficient catalysts for antibiotic remediation. The obtained MSN/β-Bi2O3/ZrO2 ternary composites possess novel lamellar cross structure, which is well constructed by β-Bi2O3 nanosheets, 3D MSNs, and ZrO2 nanoparticles. The optimal sample BZS-2 (Bi: Zr: Si = 1: 0.4: 0.33) shows an adsorptive-photocatalytic removal efficiency of 92.7% towards levofloxacin (LVF) and a total organic carbon (TOC) removal efficiency of 60.0% under simulated solar light irradiation for 100 min. BZS-2 can also remove 90.1% and 91.2% of tetracycline hydrochloride (TC) and oxytetracycline hydrochloride (OTC), respectively, and the maximum adsorption capacity of TC over BZS-2 is almost 10 times that of β-Bi2O3. The improvement of photocatalytic activity can be mainly attributed to the enhanced visible-light adsorption capacity and more efficient separation of photogenerated electron–hole pairs. A possible Z-scheme photocatalytic mechanism of β-Bi2O3/ZrO2 heterojunctions based on valence band offset (ΔEVBO) and conduction band offset (ΔECBO) is proposed. This study provides an efficient way to construct novel mesoporous ternary photocatalyst with increased accessible surface area and active sites for treatment of antibiotics by synergistic adsorption and photocatalysis. Graphical abstract
      PubDate: 2022-06-01
       
  • Tailoring microstructures of CoCrFeNiNb0.25 hypoeutectic high-entropy
           alloy by hot deformation

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      Abstract: CoCrFeNiNb0.25 hypoeutectic high-entropy alloy (HEA) has shown good mechanical properties. However, due to interdendritic eutectics, it is challenging to further optimize the microstructure through cold rolling and annealing. The current study showed that hot deformation effectively tailored the hypoeutectic microstructure. We investigated the hot deformation behavior and microstructure evolution of the dual-phase CoCrFeNiNb0.25 HEA at different temperatures from 800 to 1000 °C and different strain rates from 0.01 to 10.00 s−1. The systematic investigation showed the deformation activation energy around 500 kJ·mol−1. Microstructure with refined grains and uniformly distributed Laves phases can be obtained after 70% compression at 900 °C with a strain rate of 0.01 s−1. Graphical abstract
      PubDate: 2022-06-01
       
  • Metallurgy of aluminum-inspired formation of aluminosilicate-coated
           nanosilicon for lithium-ion battery anode

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      Abstract: Modification of Si anode with various coating matrixes is a promising strategy to resolve the unstable solid electrolyte interphase issues. However, the complex preparation process and inherently weak interaction between Si and other matrixes impede its practical application. Inspired by the metallurgical process of aluminum, an aluminosilicate matrix was prepared as coating layer on the surface of Si nanoparticles after heat treatment. Si nanoparticles with a uniform native oxide layer were used as seed crystals for the adsorption of aluminum hydroxide. The strong symbiosis and bond between alumina and silica, such as mullite (3Al2O3·2SiO2) or kaolin (Al2O3·SiO2·2H2O), provide homogeneous and durable contact coating layer. The as-produced Si/SiO2·Al2O3 composite delivers a charge capacity of 1440 mAh·g−1 at 100 mA·g−1 and remains 879 mAh·g−1 at 3 A·g−1. After 200 cycles, the capacity retention remains high at 76%. The enhanced properties were ascribed to SiO2·Al2O3 synergistic composite coating layer, which could hinder the interfacial side chemical reaction and buffer volume change of Si. Graphical abstract
      PubDate: 2022-06-01
       
  • Trimethyl phosphate-enhanced polyvinyl carbonate polymer electrolyte with
           improved interfacial stability for solid-state lithium battery

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      Abstract: The polyvinyl carbonate (PVC) polymer solid electrolyte can be in-situ generated in the assembled lithium-ion battery (LIBs); however, its rigid characteristic leads to uneven interface contact between electrolyte and electrodes. In this work, trimethyl phosphate (TMP) is introduced into the precursor solution for in-situ generation of flexible PVC solid electrolyte to improve the interfacial contact of electrolyte and electrodes together with ionic conductivity. The PVC-TMP electrolyte exhibits good interface compatibility with the lithium metal anode, and the lithium symmetric battery based on PVC-TMP electrolyte shows no obvious polarization within 1000 h cycle. As a consequence, the initial interfacial resistance of battery greatly decreases from 278 Ω (LiFePO4 (LFP)/PVC/Li) to 93 Ω (LFP/PVC-TMP/Li) at 50 °C, leading to an improved cycling stability of the LFP/PVC-TMP/Li battery. Such in-situ preparation of solid electrolyte within the battery is demonstrated to be very significant for commercial application. Graphical abstract
      PubDate: 2022-06-01
       
  • Revealing essence of magnetostructural coupling of Ni-Co-Mn-Ti alloys by
           first-principles calculations and experimental verification

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      Abstract: In this work, the effects of Co doping on the magnetostructural coupling transformation of Ni50-xCoxMn50-yTiy (x = 0–15, y = 12.5–15) Heusler alloys were systematically investigated through the first-principles calculations and experimental verification. The calculation result indicates that the doped Co atoms prefer to occupy the Ni sublattice. The Co atoms tend to flock together in terms of the lowest energy principle. Since the formation energy of the austenite is higher than that of the martensite, the alloys will undergo martensitic transformation for the Ni50-xCoxMn37.5Ti12.5 alloys (x = 0–12.5). The magnetostructural coupling point of Ni50-xCoxMn37.5Ti12.5 alloys is predicted in the vicinity of x = 11–12. Based on the computational composition Ni37.5Co12.5Mn37.5Ti12.5, the Ni36Co14Mn36Ti14 alloy with magnetostructural coupling near room temperature was experimentally developed by simultaneously increasing the Ti and Co contents. The largest magnetization change (ΔM) and magnetic entropy changes (ΔSm) obtained under magnetic field of 5 T for the martensitic transformation in the Ni36Co14Mn36Ti14 alloy are about 87.6 A·m2·kg−1 and 21 J·kg−1·K−1, respectively. The fracture strength and strain for non-textured polycrystalline Ni36Co14Mn36Ti14 alloy reach 953 MPa and 12.3%, respectively. The results show that the alloy not only possesses a large magnetocaloric effect but also has excellent mechanical properties. In addition, the 6 M modulated martensite is evidenced in the Ni-Co-Mn-Ti alloys via transmission electron microscopy technique. Graphical abstract
      PubDate: 2022-06-01
       
  • Phase selection rule of high-entropy metallic glasses with different
           short-to-medium-range orders

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      Abstract: When an equiatomic multi-component alloy is quenched from its molten state down to room temperature, either a solid solution crystalline alloy or a metallic glass is formed. The former is called a high-entropy alloy, whereas the latter is referred as a high-entropy metallic glass (HE-MG). In such multicomponent alloys, thermodynamic parameters, e.g., the mixing entropy, the mixing enthalpy and other parameters such as atomic size mismatch, determine the resulting phases. In this work, we studied the phase selection rule applied to the equiatomic multicomponent Ti20Zr20Hf20Cu20Ni20 HE-MG from a structural perspective, by analyzing the short-to-medium-range orders. It was found that the short-range order in this MG resembles a body-centered cube structure, while the medium-range order is comprised of different orders. The experimental data suggest that different packing schemes, at the medium-range scale, play a critical role in the phase selection rule with regard to an amorphous phase or solid solution. Graphical abstract
      PubDate: 2022-06-01
       
  • Rational construction of CoP@C hollow structure for ultrafast and stable
           sodium energy storage

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      Abstract: The development of transition metal phosphides as potential anode materials of sodium-ion batteries has been substantially hindered by their sluggish kinetics and significant volume change during the sodiation/desodiation process. In this work, we put forward a rational design strategy to construct a hollow-structured CoP@C composite to achieve ultrafast and durable sodium energy storage. The CoP@C composite with a well-defined hollow dodecahedron architecture has been synthesized via a stepwise treatment of carbonization and pohsphorization on ZIF-67. The unique hollow carbon framework not only provides high-speed electron/ion transportation pathways for CoP to enable fast sodiation kinetics, but also accommodates large volume change to stabilize the electrode structure. As a consequence, the CoP@C composite could exhibit an ultra-high rate capability of 105 mAh·g−1 at a current density of 30 A·g−1, and a long-term cycling lifetime. The present study will pave a fresh strategy for exploring advanced high-power anode materials for sodium ion batteries. Graphical abstract
      PubDate: 2022-06-01
       
  • Engineering of electrolyte ion channels in MXene/holey graphene electrodes
           for superior supercapacitive performances

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      Abstract: MXene has given great promises to supercapacitor electrode material due to its high conductivity and redox properties. However, the self-agglomeration of the MXene lamella will reduce its contact area with the electrolyte and generate a tortuous transportation pathway of the electrolyte ions, thereby reducing its capacitive performance and rate capability. In this work, we engineered the electrolyte ion channels by adjusting the MXene lamella size and inserting holey graphene (HG) nanosheets into the interlayer of the MXene flakes. The developed MXene/HG electrode can not only avoid the self-restacking of MXene but also provide unimpeded ion transport channels. As a result, the supercapacitive and rate performances of the small MXene lamella-based MXene/HG (S-MXene/HG) supercapacitor are prominently ameliorated. By adjusting the content of HG, the S-MXene/HG0.05 electrode exhibits excellent gravimetric capacitance of 446 F·g−1 and a rate capability of 77.5%. The S-MXene/HG0.05-based symmetric supercapacitor provides an impressive energy density of 14.84 Wh·kg−1 with excellent cyclic stability of 96% capacitance retention after 10,000 cycles. This demonstration of the engineering of the ion channels shows great potential in two-dimensional material-based supercapacitor electrodes. Graphical abstract
      PubDate: 2022-06-01
       
  • Synthesis and electrochemical properties of Mn-substituted high-capacity
           nickel hydroxide

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      Abstract: Abstract Nickel hydroxide is widely used as cathode materials in nickel-metal secondary batteries. In this work, Mn-substituted nickel hydroxide samples with a special α/β mixed phase structure were synthesized by chemical co-precipitation method. The physical properties were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC) and field emission scanning electron microscopy (FE-SEM). The results show that the structure of the samples and the amount of intercalated anions and water molecules are highly related to the content of the Mn substituted. Their electrochemical performances were characterized by charge/discharge tests and electrochemical cycle tests. The results demonstrate that the Mn-substituted samples with a α/β mixed phase structure perform a much higher discharge capacity than normal β-nickel hydroxide. The specific discharge capacity reaches 330 mAh·g−1 after 50 cycles of charge/discharge in charging rate of 0.2C under ambient temperature. Meanwhile, the samples show no capacity loss in electrochemical cycles, which indicates that the mixed phase nickel hydroxide maintains high structure stability.
      PubDate: 2022-06-01
       
  • High-entropy intermetallics: from alloy design to structural and
           functional properties

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      Abstract: Conventional intermetallics are strong but brittle. However, multi-principal element intermetallics, also termed as high-entropy intermetallics (HEIs) in the recent high-entropy alloy literature, are strong but malleable, some of which even show appreciable ductility and fracture toughness at room temperature. In this article, we provide a focused review on the recent researches on HEIs, from the fundamentals, such as the concept of HEIs, the formation rules to the structural and functional properties of HEIs. The results hitherto reported clearly show that the HEIs with distinct properties could be a promising material for future structural and functional applications. Graphical
      PubDate: 2022-06-01
       
  • Microstructure and properties of AgCu/2 wt% Ag-added Sn–Pb solder/CuBe
           joints fabricated by vapor phase soldering

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      Abstract: Abstract The purpose of this paper is to investigate the effect of 2 wt% Ag addition in Sn–Pb eutectic solder on microstructure and mechanical properties of AgCu/solder/CuBe joint fabricated by vapor phase soldering. 63Sn37Pb and 62Sn36Pb2Ag solder pastes were used to join Cu(1.7 wt%–2.5 wt%)Be and Ag(2 wt%–5 wt%)Cu alloys. Two fracture modes are observed in 62Sn36Pb2Ag and 63Sn37Pb joints after lateral shear tests at room temperature or 120 °C, and shear forces of 62Sn36Pb2Ag joints are far higher than those of 63Sn37Pb joints. No obvious difference is observed in morphology and thickness of intermetallic compounds (IMCs) at interfaces of the 63Sn37Pb and 62Sn36Pb2Ag joints. Within the two kinds of joints, formation of big blocky or plate-like Ag3Sn is restrained. However, many Ag3Sn IMCs particles (1–3 μm in width) in isolated and dispersed distribution are observed within 62Sn36Pb2Ag joints. The Ag3Sn particles are responsible for the better mechanical properties of 62Sn36Pb2Ag joints than those of 63Sn37Pb joints. The results present in this paper may provide a guide for restraining formation of big blocky or plate-like Ag3Sn in joints with Ag pads or thick Ag surface finish on pads by utilizing vapor phase soldering process, and improving mechanical properties of Cu/SnPb/Ag joints by adding Ag in SnPb eutectic solder.
      PubDate: 2022-06-01
       
  • Determining hydrothermal deactivation mechanisms on Cu/SAPO-34 NH3-SCR
           catalysts at low- and high-reaction regions: establishing roles of
           different reaction sites

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      Abstract: Hydrothermal deactivation is a constant challenge in commercial catalytic process aimed at NOx emission control, which may be observed in the low (150–400 °C) or high (400–550 °C)-reaction regions. To the best of our knowledge, there is a lack of systematic research regarding the correlation between the reaction sites and the mechanism of hydrothermal degradation at various reaction regions. For a targeted investigation of this, Cu/zeolite catalysts have been prepared using different amounts of polyvinyl alcohol for adjusting their redox and acid properties. These catalysts exhibit hydrothermal deactivation in different reaction regions. No change is observed in the reaction mechanism even with hydrothermal deactivation, but various reaction sites determine the performance deterioration in the low- and high-reaction regions. The redox properties and weak acid sites affect the hydrothermal deactivation in the low-reaction region, whereas the moderate/strong acid sites related to the structure mainly influence the hydrothermal deactivation in the high-reaction region. This work provides several theoretical insights for optimizing the hydrothermal stabilities of Cu/zeolite catalysts. Graphical abstract
      PubDate: 2022-06-01
       
  • Composite polymer electrolytes reinforced by a three-dimensional
           polyacrylonitrile/Li0.33La0.557TiO3 nanofiber framework for
           room-temperature dendrite-free all-solid-state lithium metal battery

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      Abstract: Substituting liquid electrolytes with solid electrolytes is considered as an important strategy to solve the problem of flammability and explosion for traditional lithium-ion batteries (LIB). However, neither inorganic solid electrolytes (ISE) nor solid polymer electrolytes (SPE) alone can meet the operating requirements for room-temperature (RT) all-solid-state lithium metal batteries (ASSLMB). Here, we report a three-dimensional (3D) nanofiber framework reinforced polyethylene oxide (PEO)-based composite polymer electrolytes (CPE) through constructing a nanofiber framework combining polyacrylonitrile (PAN) and fast Li-ion conductor Li0.33La0.557TiO3 (LLTO) framework by electrospinning method. Meanwhile, the PEO electrolyte filled in the pores of the PAN/LLTO nanofiber framework can effectively isolate the direct contact between the chemically active Ti4+ in LLTO with lithium metal, thereby avoiding the occurrence of interfacial reactions. Enhanced electrochemical stability makes a wide electrochemical window up to 4.8 V with an ionic conductivity of about 9.87 × 10–5 S·cm−1 at RT. Benefiting from the excellent lithium dendrite growth inhibition ability of 3D PAN/LLTO nanofiber framework, especially when the mass of LLTO reaches twice that of the PAN, Li/Li symmetric cell could cycle stably for 1000 h without a short circuit. In addition, under 30 °C, the LiFePO4/Li ASSLMB using such CPE delivers large capacities of 156.2 and 140 mAh·g−1 at 0.2C and 0.5C, respectively. These results provide a new insight for the development of the next generation of safe, high-performance ASSLMBs. Graphical
      PubDate: 2022-06-01
       
  • Selective introduction of surface defects in anatase TiO2 nanosheets for
           highly efficient photocatalytic hydrogen generation

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      Abstract: Defect engineering greatly enhances the catalytic activity of transition metal semiconductor photocatalysts. Recently, localized surface defects engineering has been intensively researched, but it still remains challenges on how to tilt the balance to the controllable construction of surface defects rather than bulk ones. Here, we report a facile room-temperature solution processing strategy on (001) facet exposed anatase TiO2 nanosheets (ATO), in which localized defects are generated on the surface selectivity with high concentration. To achieve the aspect, lithium-ethylenediamine (Li-EDA) treatment is carried out on (001) facet exposed ATO under a mild condition. The optimized sample exhibits outstanding photocatalytic H2 production rates of 9.28 mmol·g−1·h−1 with loading 0.5 wt% Pt as co-catalyst (AM 1.5), which is nearly 7.5 times higher than that of the pristine ATO. This defect engineering strategy of ATO photocatalyst will spark the ideas for the defects engineering and semiconductor photocatalyst, which is with important application prospect in solar energy conversion, including hydrogen generation and carbon dioxide reduction. Graphical abstract
      PubDate: 2022-06-01
       
  • Microstructure and mechanical properties of lightweight AlCrTiV0.5Cux
           high-entropy alloys

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      Abstract: Graphical abstract
      PubDate: 2022-06-01
       
  • Unravelling critical role of metal cation engineering in boosting hydrogen
           evolution reaction activity of molybdenum diselenide

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      Abstract: Graphical abstract
      PubDate: 2022-06-01
       
  • Co single atoms and nanoparticles dispersed on N-doped carbon nanotube as
           high-performance catalysts for Zn-air batteries

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      Abstract: Diminishing the size of active sites in catalysts is promising to improve the kinetics of oxygen reduction reaction (ORR) and reduce the cost of metal–air batteries. However, the facile preparation of high-performance catalysts with nanoscale active sites still suffers from great challenge. Herein, we report a facile template-free strategy to fabricate Co single atoms and nanoparticles dispersed on porous N-doped carbon nanotube (Co-NCNT) by the pyrolysis of the composites of metal–organic complexes and porous carbon nanotube. Different from the conventional strategy, the precursor metal–organic complexes in this work were prepared under mild conditions and used without complex purification procedures. Compared with the pristine carbon nanotube, N-doped carbon nanotube with abundant mesopores contribute to the formation of nanoscale Co sites. This resultant electrocatalyst Co-NCNT shows an impressive ORR half-wave potential of 0.87 V in alkaline solution, outperforming that of commercial Pt/C (20 wt%). The catalyst Co-NCNT displays high tolerance to strong alkali solution, endowing the aqueous Zn-air batteries with high discharge voltages and power density. In addition, the specific capacity achieves 803 mAh·gZn−1 under a current density of 10 mA·cm−1. This research provides a new solution for the simple synthesis of carbon-based electrocatalysts for metal–air batteries.
      PubDate: 2022-06-01
       
 
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