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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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    Interface asymmetry and phase transformation of the Cu layer-inserted Al/Cu/Ni/Cu multilayers

    Ye F.Wang Y.Liu B.Liu C....
    10页
    查看更多>>摘要：? 2022 Elsevier B.V.Thin Cu layers are inserted at the interfaces of initial Al/Ni binary multilayers during magnetron deposition to form the (Al/Cu/Ni/Cu)4 (ACNC) multilayers. The effects of thin Cu layers on interface structure, atomic diffusion, and phase transformation were studied. TEM results confirmed the asymmetric interface structure and distinct interdiffusion between Cu and Ni of the as-deposited ACNC multilayers. CuAl2 preferentially formed but totally disappeared at higher temperatures. The integrated and dense Ni/Cu/Al interfaces (Cu deposited on Al layer followed by an upper new Ni layer) in the middle and upper Al layers strongly hindered the diffusion at early stage, which suppressed the formation of Al3Ni in a large scale but did not change the phase composition at 773 K compared to the multilayers without Cu added. The findings suggested that the inserted Cu layer could avoid the energy reduction caused by intermixing of Al and Ni, but have less effect on the final products, which might help to realize the balance of storage stability and reaction performance with respect to the applications.
      原文链接:
    • NSTL
    • Elsevier

    Enhanced oxygen reduction of porous N-doped carbon nanosheets with graphitic N and defects obtained from coal-based graphene quantum dots

    Lei J.Wang K.Li Y.Zhang S....
    10页
    查看更多>>摘要：? 2022 Elsevier B.V.Metal-free carbon-based electrocatalysts for oxygen reduction reaction (ORR) have received considerable attention owing to their abundance and low cost. However, designing carbon-based electrocatalysts with excellent performance in a facile manner remains a challenge. In this work, porous nitrogen-doped carbon nanosheet (PNCNs) catalysts with high contents of graphitic N and defects were readily prepared via a simple self-doping method, in which coal-based graphene quantum dots (GQDs) were used as the carbon and nitrogen resource. Based on the results, PNCNs-900 (obtained at 900 °C) displayed good ORR performance, with a half-wave potential (E1/2) of 0.80 V. It also exhibited high stability and methanol tolerance compared with commercial Pt/C. Experimental investigations and theoretical calculations prove that the increased ORR electrocatalytic activity of PNCNs-900 is due to the synergistic effect of a large number of defects and graphitic N. Furthermore, its higher electrocatalytic activity for ORR also benefits from the porous lamellar structure, which facilitates the mass transfer process. This study offers a novel approach for developing effective ORR catalysts and for the high value-added utilization of coal resources.
      原文链接:
    • NSTL
    • Elsevier

    Electroconversion synthesis of Ni/Co layered nanomaterials for high-performance supercapacitors

    Lin S.Zhang T.Liu Y.Yang H....
    8页
    查看更多>>摘要：? 2022 Elsevier B.V.Ni/Co(OH)2 nanosheets were prepared through an electroconversion reaction with CoCl2.6 H2O and NiCl2.6 H2O as raw materials and without an added structural guiding agent. NiCo2O4 was obtained by calcination with Ni/Co(OH)2 as a precursor. The structure and morphology of Ni/Co(OH)2 and NiCo2O4 were characterized by XRD, FTIR, XPS, and SEM. The characterization results show that the particle size range of Ni/Co(OH)2 with a three-dimensional nanostructure is 10–84 nm, and it is formed by staggered stacking of nanosheets with a thickness of approximately 19 nm. The electrochemical test results show that the specific capacitance of the Ni/Co(OH)2 nanosheet electrode in 1 M KOH electrolyte and 1 A/g current density is as high as 908.33 F/g, which can be attributed to its unique three-dimensional nanolayered structure, and as a result, more redox reaction active sites can be provided in the charge storage process. In addition, the structure of the Ni/Co(OH)2 nanosheet electrode can slow down the volume change during the charge–discharge cycle and maintain the stability of the structure. Under the high current density of 10 A/g, the specific capacitance retention rate is 71% at 1500 cycles and 74% at 3500 cycles, but then it shows a downwards trend. The capacitance retention rate fluctuates between 60% and 30%. After 10000 cycles, the specific capacitance retention rate is still 30%, indicating that the electrode exhibits a good cycle performance.
      原文链接:
    • NSTL
    • Elsevier

    Mechanical spectroscopy study of as-cast and additive manufactured AlSi10Mg

    Cabibbo M.Montanari R.Varone A.Pola A....
    12页
    查看更多>>摘要：? 2022 Elsevier B.V.The AlSi10Mg alloy produced by casting (AC) and additive manufacturing (AM) technology of laser powder bed fusion (L-PBF) has been investigated through mechanical spectroscopy (MS). In addition to the grain boundary peak PGB the Q?1 curves of both materials exhibit two other relaxation peaks, P1 (H = 0.8 ± 0.05 eV; τ0 = 10?11±1 s) and P2 (H = 1.0 ± 0.05 eV; τ0 = 10?13±1 s), depending on the interaction of dislocations with solute elements (Si and Mg). Relaxation strengths of P1, P2 and PGB of AM alloy are greater than those of the AC one owing to the finer structure of Al cells and the higher amount of Si and Mg in supersaturated solid solution induced by the rapid solidification typical of the L-PBF process. After successive MS test runs relaxation strengths of P1 and P2 peaks in both the examined materials decrease due to the precipitation of Si atoms and dislocation density recovery. Such decrease is more pronounced in AM alloy where change of cell shape and increase of cell size is observed. Dynamic modulus of AM alloy exhibits an anomalous trend in the first test run that is no more present in successive runs. The irreversible process giving rise to such anomalous behavior is the closure of pores of nanometric size.
      原文链接:
    • NSTL
    • Elsevier

    Enhancing hydrogen evolution through urea electrolysis over Co-doped Ni-P-O film on nickel foam

    Cao J.Zheng Y.Pan J.Wang J....
    11页
    查看更多>>摘要：? 2022 Elsevier B.V.A Co-doped Ni-P-O film supported on nickel foam is successfully prepared. It exhibits high activity toward urea oxidation reaction (UOR) and hydrogen evolution reaction (HER). Regarding UOR, the onset potential of Ni-P-O is reduced by the introduction of Co and gradually decreases with the incremental of Co content in the film ascribed to the reduction of conversion potential of Ni2+/Ni3+. Concerning HER, the incorporated Co in Ni-P-O film not only increases the amounts of active sites, but also boost the synergetic effect on water dissociation and hydrogen desorption. Particularly, the optimum activity of Ni-P-O is achieved by the introduction of an 8% cobalt source (8% Co:Ni-P-O/NF), which offers the highest activity with the lowest overpotential of 94 mV and Tafel slope of 46.2 mV·dec?1. Furthermore, the efficiency of hydrogen generation is further improved by urea-assistance over the electrolyzer coupled with 8% Co:Ni-P-O/NF electrode. Only 1.481 V is needed to afford 20 mA·cm?2 in urea-mediated electrolysis cell, much lower than that for urea-free electrolyte with 1.689 V.
      原文链接:
    • NSTL
    • Elsevier

    Effect of annealing heat treatment on microstructure and corrosion behavior of Ti6Al4V alloy fabricated by multi-laser beam wire-feed additive manufacturing in vacuum environment

    Ding X.Ma H.Zhang Q.Yang J....
    11页
    查看更多>>摘要：? 2022 Elsevier B.V.Ti6Al4V alloy thin wall was successfully fabricated by multi-laser beam wire-feed additive manufacturing in vacuum environment. The effect of annealing heat treatment (AHT) on microstructure and corrosion behavior of specimens in 3.5 wt% NaCl and 1 mol/L H2SO4 electrolytes was investigated. Results showed that AHT led to the reduction of the non-equilibrium phase α′ and texture weakening. AHT700 was beneficial to achieve crystal refinement while AHT850 had obvious coarsening phenomenon. In addition, AHT could improve the corrosion behavior of the specimens due to the reduction of α′ phase and relief of residual stress. Compared with the specimen of AHT850, the specimen of AHT700 with finer crystal size and obvious texture weakening improved the corrosion resistance more obviously.
      原文链接:
    • NSTL
    • Elsevier

    PEDOT/Cobalt hexacyanoferrate free-standing films for high-performance quasi-solid-state asymmetric supercapacitor

    Choi J.Lee J.Lim J.Park S....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.Recently, with the increasing number of electronic devices and electric vehicles, supercapacitors have been investigated as high-performance energy storage devices. However, most electrodes fabricated with inactive additives (binder and conductive agent) have a problem with dead mass in the electrodes, which limits the application of lightweight energy storage devices. Herein, poly[3,4-ethylenedioxythiophene] nanowires (PEDOT NWs)/Cobalt hexacyanoferrate nanoparticles (CoHCF NPs) free-standing films (PCF films) were prepared using a vacuum-assisted filtration process. The PEDOT NWs acted not only as active materials but also as conductive substrates and provide numerous sites for the CoHCF NPs to achieve enriched redox reactions. The as-prepared free-standing PCF-4 electrode displays a high areal capacity of 386.4 μA h cm?2 at a current density of 1 mA cm?2 and the long-term stability in 1 M Na2SO4 electrolyte. The fabricated quasi-solid-state asymmetric capacitor (PCF-4//activated carbon) shows a high energy density of 0.126 mW h cm?2 and power density of 0.82 mW cm?2.
      原文链接:
    • NSTL
    • Elsevier

    N-heterocycle-functionalized graphene oxide complexed with cobalt(II) as symmetric supercapacitor electrodes

    Aliakbari R.Kowsari E.Najafi M.D.Naderi H.R....
    13页
    查看更多>>摘要：? 2022 Elsevier B.V.Herein, 5-amino-substituted 1,10-phenanthroline-functionalized graphene oxide (N-FGO) was complexed with cobalt(II), and synthesized nanocomposite (N-FGO-Co nanocomposite) used in an actual symmetrical supercapacitor. First, the nanocomposite was analyzed by XPS, XRD, FT-IR, SEM, TEM, and BET. After structural characterization, electrochemical tests (CV, GCD, and EIS) in three-electrode systems were performed to investigate the electrochemical behavior of the nanocomposite. N-FGO-Co nanocomposite exhibits quasi-rectangular shape CV diagrams, triangular and symmetrical GCD diagrams, low resistance, and high stability. The results confirmed the ideal electrochemical behavior of this composite as the supercapacitor electrode. In three-electrode system, the specific capacitance of 512 and 541 F g?1 were calculated at current density of 1 A g?1 and scan rate of 5 mV s?1, respectively. Then, the nanocomposite was investigated as positive and negative electrodes in a symmetrical supercapacitor. The N-FGO-Co//N-FGO-Co system shows specific capacity of 268 and 266 F g?1 at current density of 0.5 A g?1 and the scan rate of 5 mV s?1, respectively. Also, two-electrode system has good specific energy/specific power. The retention capacitance of three- and two-electrode systems, after 5000 charge-discharge cycles, were measured as 95.2% and 93.9%, respectively. The results confirm the high potential of synthesized nanocomposite in the application of supercapacitor electrode.
      原文链接:
    • NSTL
    • Elsevier

    Energy spacing and sub-band modulation of Cu doped ZnSe quantum dots

    Kim J.S.Kim S.H.Lee H.S.
    6页
    查看更多>>摘要：? 2022 Elsevier B.V.Cu doped ZnSe quantum dots (QDs) with various dopant concentrations were prepared using a growth doping technique to modulate their kinetics of Cu incorporation. Pre-synthesized ZnSe QDs with a low defect concentration and strong band-edge emission were fabricated under controlled reaction conditions, resulting from the low surface-to-volume ratio. The growth doping process was used to synthesize Cu doped ZnSe QDs and growth doping completed interior doping used Cu as a doping agent. The Cu doping overcomes the wavelength constraints of ZnSe QDs and enables elimination of the ZnSe host emission due to the formation of Cu states. Increasing the Cu dopant concentration to 0.4% resulted in an increase in the Cu-related emission intensity owing to the dominant recombination pathway which transfers to the Cu states, demonstrating the successful incorporation of Cu dopant atoms. The emission wavelength tuning of ZnSe QDs through Cu doping is clearly independent of the size variation, as evidenced by the ZnSe and Cu doped ZnSe QDs exhibiting similar nanoscale features.
      原文链接:
    • NSTL
    • Elsevier

    Fabrication of PtCuCo double-layered rhombic dodecahedral nanoframes for efficient methanol electrooxidation catalysis

    Wang J.Yan H.Li X.
    7页
    查看更多>>摘要：? 2022 Elsevier B.V.Pt-based nanoframes have great application prospects due to their inherent large surface-to-mass ratio and high atom utilization. To date, there have been numerous reports on the synthesis of single-layered nanoframes, but the preparations of double-layered nanoframes have rarely been reported. Here, PtCuCo double-layered rhombic dodecahedral nanoframes (DNFs) were successfully prepared via a one-pot solvothermal synthesis and an acid etching post-treatment. In the first step, PtCuCo heterogeneous nanocrystals (HNCs) were constructed each consisting of a Cu-enriched core, PtCuCo double-layered nanoframes, and a Co-enriched shell, and in the second step, PtCuCo DNFs were obtained by acid-assisted selective removal of the leachable components. Evolution experiments reveal that the galvanic substitution reaction between Pt(II) precursor and Cu-enriched nuclei, the following outer-layer deposition of Co, and the atomic migration of Pt are responsible for the formation of PtCuCo HNCs. Remarkably, the electrocatalytic test of PtCuCo DNFs toward methanol oxidation reaction (MOR) shows a mass activity and a specific activity of 1.25 A mg?1Pt and 4.53 mA cm?2, which are 2.7 and 4.9 times higher than those of commercial Pt/C catalyst. Moreover, the PtCuCo DNFs exhibit improved electrocatalytic stability for MOR compared to Pt/C catalyst.
      原文链接:
    • NSTL
    • Elsevier