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Journal of Alloys and Compounds
Elsevier Science S.A.
Journal of Alloys and Compounds

Elsevier Science S.A.

0925-8388

Journal of Alloys and Compounds/Journal Journal of Alloys and CompoundsSCIISTPEI
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    Cathode materials of metal-ion batteries for low-temperature applications

    Pang, XiaowanAn, BaigangZheng, ShuminWang, Bao...
    21页
    查看更多>>摘要：Energy storage devices have been developed greatly in recent years. Developing forward, they are expected to operate stably in electric vehicles, electric grids, military equipment, and aerospaces in various climates. Unfortunately, these areas require batteries to be repeatedly and periodically exposed to sub-zero temperatures, even extremely low temperatures (-40 degrees C or lower). The low temperature reduces the kinetics of all the activation processes of the batteries, leading to increased impedance and polarization, and loss of battery energy and power, thus restricting their performance. Developing new cathode materials is one of the main strategies to alleviate the low-temperature restrictions. A conventional lithium-ion battery is the most attractive system, which is more adaptive to the practical low-temperature application now. Sodium ion batteries, magnesium-ion batteries, and zinc-ion batteries, which have the advantages of low cost and high safety, are considered potential substitutes for lithium-ion batteries, the electrochemical performance of these batteries at low-temperature has been conducted extensively. This review provides an overview of lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, and zinc-ion batteries that can work normally in low-temperature environments, with emphasis on various high-energy cathode materials, mainly including polyanionic compounds, layered oxides, spinel oxides, Prussian blue, and Prussian blue analogs. Specifically, we propose how the conventional low-temperature charge-transfer resistance can be overcome. However, these chemistries also present their own unique challenges at low temperatures. This article discusses the advantages and disadvantages of these materials, as well as the main challenges and strategies for applying them to batteries at low temperatures so that the batteries can still discharge efficiently.(c) 2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    Effect of Nb and Ta addition on mechanical properties of Zr-based bulk metallic glasses and composites

    Long, ZiyunTao, PingjunWang, GuotaiZhu, Kunsen...
    10页
    查看更多>>摘要：To modify the poor plasticity of bulk metallic glasses (BMGs) under room temperature, the present work reported that microalloying can improve the plasticity of BMGs, and the deformation mechanism at room temperature was elucidated. The selection of minor elements, Nb and Ta have a positive heat of mixing with the based compositions. The maximum plasticity of 32.9% is shown in the Nb1 sample. The self-organize to a critical state (SOC) occurred in all BMGs, the scaling exponent beta value maintains the constant 0.24. The variation of the rotation angle of primary shear bands (SBs) is in agreement with plasticity. Meanwhile, the yield strength is linearly dependent on the local fracture toughness of BMGs. Summarily, the compressive plasticity of BMGs at room temperature can be improved by adding elements that can form positive mixing heat with the components of based compositions.(c) 2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    Constructing hierarchical structure electrocatalyst for efficient hydrogen evolution and selective oxidation of benzylamine

    Shang, NingzhaoWang, ZhenLiu, SiweiMa, Sicheng...
    9页
    查看更多>>摘要：Replacing oxygen evolution reaction (OER) with thermodynamically favorable oxidation reactions is a promising strategy to enhance the cathodic hydrogen production. In this paper, Mo doped CoNi metal-organic framework (MOF)-layered double hydroxide (LDH) nanosheet supported on Ni foam was con-structed. The obtained MOF@LDH-Mo heterostructure array possessed large tangible surface area, rich active species and open electron transport channels, which was employed as electrocatalyst for benzyla-mine oxidation reaction (BOR) to replace OER for boosting hydrogen evolution. Benefitting from the unique structures, the MOF@LDH-Mo presented unprecedented intrinsic activity toward BOR, a high current density of 325 mA cm(-2) can be reached at 1.7 V (vs RHE) in 1 molmiddotL-1 KOH solution. Meanwhile, the cell voltage decreased sharply, especially compared with that of overall water splitting (e.g. a reduction of 260 mV for the benchmark current density of 100 mA cm(-2)). Apart from H-2 production at cathode, value added chemical, benzonitrile, was yielded at anode with high Faradaic efficiency. This research provides an environmental friendly aqueous electrocatalytic route for production of valuable chemicals as well as green energy, hydrogen. (C)& nbsp;2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    A novel direct Z-scheme heterojunction BiFeO3/ZnFe(2)O(4 )photocatalyst for enhanced photocatalyst degradation activity under visible light irradiation

    Jiang, XueWang, ZhihaoZhang, MengxuanWang, Mutong...
    10页
    查看更多>>摘要：In recent years, inhibition of photoinduced electron and hole recombination is considered as a breakthrough to improve the photocatalytic degradation of pollutants. In this study, we successfully loaded ZnFe2O4 (ZFO) microsphere onto BiFeO3 (BFO) microcubes via a simple hydrothermal method, and intimate interface between BFO and ZFO was constructed. Under the effect of heterojunction between BFO and ZFO, the recombination rate of photogenerated electron-hole pairs was decreased significantly, leading to the enhanced photocatalytic effect. The photocatalytic experiments show that the degradation efficiency of BFO/ ZFO-10% composite for tetracycline and methylene blue are 1.63 and 1.38 times higher than that of pure BFO. In addition, four cycles experiment also proved that BFO/ZFO has good stability and excellent magnetic recovery properties. A possible carrier transfer path on the base of the direct Z-scheme mechanism in composite was proposed. This study provides a useful guide toward the design of the highly efficient and magnetic collectable photocatalysts by the introduction of magnetic component and the construction of heterojunction, and as-synthesized BFO/ZFO was proved to be a promising photocatalyst for the elimination of toxic organic molecules in groundwater. (C)& nbsp;2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    Optical properties of Au-Hf thin films

    Littlehailes, HughHendren, William R.Bowman, Robert M.Huang, Fumin...
    6页
    查看更多>>摘要：The optical properties of thin films of intermetallic Au3Hf were experimentally investigated for the first time, which display significant negative epsilon' in the visible and near infrared regions, hence are clearly plasmonic materials. In contrast to similar alloys, such as films of Au3Zr, the films express more negative epsilon' values and lower epsilon '' values across most of the wavelengths (370-1570 nm) investigated. The Au3Hf films were fabricated by DC magnetron sputtering at a range of deposition temperatures, from room temperature to 415 degrees C, and annealed at different vacuum levels. The films mostly formed as a combination of Au3Hf, Au2Hf and Au4Hf phases when deposited below 400 degrees C, and exclusively Au3Hf phase at above 400 degrees C, indicating key conditions for isolating this phase. The films were stable when annealed at 10(-8) Torr, but when annealed again at 10(-6) Torr the films oxidised and changed into a mix of Au-Hf phases, suggesting resistance to oxidization may be an issue for unencapsulated applications at elevated temperatures. (C) 2022 Published by Elsevier B.V.
      原文链接:
    • NSTL
    • Elsevier

    Growth of nano-branches on 1-D WO3 nanotrees by flame process and its photoelectrochemical performances

    Yoon, Sang-HyeokNguyen, Minh HaiKim, Kyo-Seon
    9页
    查看更多>>摘要：Flame vapor deposition (FVD) is a powerful method to prepare rapidly and economically the nanostructured thin film with high purity and high crystallinity. One-dimensional (1-D) nanostructured tungsten oxide (WO3) thin film has high potential for various applications as photocatalytic material and, in this study, was prepared from tungsten wire as a precursor by FVD process. The nucleation and growth rates in FVD process could be controlled by changing the precursor supply rate in flame instantaneously by installing additional wire traverse feeder and the nanotree structured WO(3 )thin film was prepared successfully. The concentration of nano-branches at nanotree structured WO3 thin films could be controlled by adjusting wire traversing speed. The proper wire traverse feeding speed could increase surface area and allow more light absorption by additional growth of nano-branches, but too low wire traverse feeding speed could make random and dense growth of nano-branches to reduce the electrical properties and total surface area. The proper growth of nano-branches could increase the photoelectrochemical (PEC) performance of WO3/BiVO4 heterojunction thin film by providing the larger interfacial contact area for heterojunction, but too much growth of nano-branches could reduce the PEC performance because of non-uniform loading of BiVO(4 )in WO3 thin film during spin-coating process. This study can be a basis to prepare by FVD process not only the nanotree structured WO3 thin film for its PEC application but also many nanostructured thin films of various materials for their suitable applications. (C)& nbsp;2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    Tailoring NiO@NiFe2O4/CNTs triphase hybrids towards high-performance anode for lithium-ion batteries

    Yao, Li-HuaZhao, Jian-GuoPan, Qi-LiangLi, Xin-Yu...
    10页
    查看更多>>摘要：NiFe(2)O(4 )has attracted great attention in the field of energy storage, but its application is limited due to the serious volume expansion. NiO@NiFe2O4/CNTs triphase hybrids were tailored through simple hydrothermal method with the regulation of CNTs content in triphase hybrids. The results of electrochemical performance study indicate that NiO@NiFe2O4/90CNTs triphase hybrid with CNTs content of 61.759% exhibits high discharge specific capacity of 721.65 mAh g-1 at 0.1 A g(-1) after 100 cycles, and almost 1000 mAh g(-1) at 0.5 A g(-1) after 300 cycles. The distinguished electrochemical performance is due to the synergistic effect of NiO@ NiFe2O4 and CNTs, as well as the tailoring of NiO@NiFe2O4/CNTs triphase hybrids. This work demonstates that NiO@NiFe2O4/CNTs triphase hybrid is a superb anode material for lithium-ion batteries and the importance of tailoring materials, providing new insights for searching next generation of lithium storage materials. (C)& nbsp;2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    Heterostructured ultrafine metal oxides nanoparticles anchored on Co-MOF nanosheets obtained by partial pyrolysis for promoted oxygen evolution reaction

    Lv, DongmeiSu, ShibiaoZhang, ShifanCai, Dandan...
    8页
    查看更多>>摘要：The anchor of functional materials on metal-organic frameworks (MOFs) nanosheets to precisely construct fascinated heterostructures for electrocatalysis is highly promising but challenging owing to the different interfacial thermodynamics and nucleation kinetics. In this work, we design and synthesize ultrafine metal oxides nanoparticles (NPs) homogenously distributed on cobalt-based MOF (Co-MOF) nanosheets for oxygen evolution reaction (OER) by a facile solvothermal reaction and subsequent partially controlled pyrolysis. The ultrafine Co3O4 NPs with a particle size of about 1.5 nm can be obtained from the dispersed elemental Co in Co-MOF and uniformly generated on the surface of the MOF, which is crucial for the for-mation of the unique heterostructure. The well-designed Co-MOF-350 exhibits an efficient electrocatalytic activity with a low overpotential of 239 mV at a current density of 10 mA cm(-2) and a small Tafel slope of 63 mV dec(-1), and an outstanding catalytic stability for OER, much superior to the pure Co-MOF and Co3O4 electrocatalyst. The intriguing OER performance mainly originates from the desirable combination of the abundant active sites, the extended electron transport channel between ultrafine metal oxides and Co-MOF nanosheets. More importantly, the work will help to design novel heteroarchitectured MOFs-based composites as efficient and robust electrocatalysts for practical applications. (C)& nbsp;2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    Thermoelectric properties of Sm-doped BiCuSeO oxyselenides fabricated by two-step reactive sintering

    Novitskii, AndreiSerhiienko, IlliaNovikov, SergeyKuskov, Kirill...
    8页
    查看更多>>摘要：Among layered oxygen-containing compounds, BiCuSeO is one of the most promising candidates for thermoelectric applications due to its intrinsically low thermal conductivity and good thermal stability. However, the rather poor electrical conductivity of pristine BiCuSeO hinders its potential. Further enhancement of the thermoelectric performance by single doping at Bi site is limited mainly due to dramatic decrease of carrier mobility. Thus, new strategies, such as dual doping or doping with variable-valence elements seem to be promising. Along with that, the development of a fast and scalable synthesis route is essential for the industrial-scale fabrication of thermoelectric materials. Hence, in this paper, Bi1-xSmxCuSeO samples (0 <_ x <_ 0.08) have been synthesized with a simple and scalable reactive sintering process. For comparison, Bi1-xSmxCuSeO oxyselenides were also obtained by the conventional solid-state route. Our results highlight that, Sm for Bi substitution increases the electrical conductivity by 1.5-2 times and decreases the Seebeck coefficient by ~1.4 times at 873 K for both series. Overall, considering the increase of lattice thermal conductivity upon doping and not optimized power factor, the figure of merit zT is reducing upon doping.(C)& nbsp;2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    X-ray diffraction, magnetic measurements and M?ssbauer spectroscopy of MgFe2O4 nanoparticles

    Ushakov, M. V.Nithya, V. D.Kumar, N. RajeeshArunkumar, S....
    11页
    查看更多>>摘要：Magnesium ferrite (MgFe2O4) was synthesized using the solution combustion method. The concentration of the fuel was varied and investigated its effect on spectroscopic, structural and magnetic properties of MgFe2O4 nanoparticles. The XRD pattern showed a decrease in the crystallite size and increase in the lattice strain, dislocation density and specific surface area upon increasing the fuel amount. The shift in the FTIR band (~434 cm-1) corresponds to the Fe-O vibration in the octahedral sites. The values of HC decreased while Mr values increased continuously with the increase of the fuel concentration. The Mossbauer spectra of MgFe2O4 nanoparticles measured with a high velocity resolution demonstrated a large number of magnetic sextets assigned to the tetrahedral (A) and octahedral [B] sites. These magnetic sextets were considered as a result of different Fe3+ local microenvironments depending on Mg2+ cations distributions among the neighboring (A) and [B] sites. The calculations of binomial distribution of the probabilities of the numbers of Mg2+ cations within the sphere of 3.7 A around Fe3+ cations in both (A) and [B] sites demonstrated distributions of different probabilities for these sites in agreement with the Mossbauer spectra fits. The numbers of magnetic sextets and their hyperfine parameters assigned to the (A) and [B] sites were found slightly varied for MgFe2O4 nanoparticles prepared with different fuel concentrations.(c) 2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier