Jiangsu Key Laboratory of Advanced Metallic Materials

Nanjing, China

Jiangsu Key Laboratory of Advanced Metallic Materials

Nanjing, China
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Lou Y.,Nanjing Southeast University | Lou Y.,Jiangsu Key Laboratory of Advanced Metallic Materials | He D.,Nanjing Southeast University | He D.,Jiangsu Key Laboratory of Advanced Metallic Materials | And 6 more authors.
Chemical Engineering Journal | Year: 2017

A novel nanocomposite, ultrasmall Co3O4 nanoparticles decorated on ultrathin surface of MoS2 nanosheets, namely MoS2/Co3O4, was synthesized as an anode material for lithium ion battery. The discharge capacity of MoS2/Co3O4 nanocomposite reached 1100.0 mAh g−1 after 50 cycles at 200 mA g−1, much higher than the pure Co3O4 nanoparticles. Moreover, it could maintain reversible capacity of 946.6 mAh g−1 even after 50 cycles at a high current density of 500 mA g−1. While increasing the current densities step by step from 100 to 200, 500, and 800 mA g−1, the capacities of MoS2/Co3O4 nanocomposite are 1474.9, 1209.9, 952.6 and 801.9 mAh g−1, respectively. The excellent electrochemical performance resulted from the designed nanocomposite composed of uniformly distributed ultrasmall Co3O4 nanoparticles and ultrathin MoS2 nanosheets, which maximally utilized electrochemical active MoS2 nanosheets and Co3O4 nanoparticles for lithium ion batteries. Moreover, this composite structure may provide more extra spaces for the storage of lithium ions and help to accommodate the volume change through a synergistic interaction between two active materials. © 2016 Elsevier B.V.

Du M.,Nanjing Southeast University | Du M.,Jiangsu Key Laboratory of Advanced Metallic Materials | He D.,Nanjing Southeast University | Lou Y.,Nanjing Southeast University | And 3 more authors.
Journal of Energy Chemistry | Year: 2017

Nanostructured metal oxides derived from metal organic frameworks have been shown to be promising materials for application in high energy density lithium ion batteries. In this work, porous nanostructured ZnCo2O4 and Co3O4 were synthesized by a facile and cost-effective approach via the calcination of MOF-74 precursors and tested as anode materials for lithium ion batteries. Compared with Co3O4, the electrochemical properties of the obtained porous nanostructured ZnCo2O4 exhibit higher specific capacity, more excellent cycling stability and better rate capability. It demonstrates a reversible capacity of 1243.2 mAh/g after 80 cycles at 100mA/g and an excellent rate performance with high average discharge specific capacities of 1586.8, 994.6, 759.6 and 509.2 mAh/g at 200, 400, 600 and 800mA/g, respectively. The satisfactory electrochemical performances suggest that this porous nanostructured ZnCo2O4 is potentially promising for application as an efficient anode material for lithium ion batteries. © 2017 Science Press.

Guo X.,Nanjing Southeast University | Guo X.,Jiangsu Key Laboratory of Advanced Metallic Materials | Xing T.,Nanjing Southeast University | Lou Y.,Nanjing Southeast University | And 3 more authors.
Journal of Solid State Chemistry | Year: 2016

Zeolitic imidazolate frameworks ZIF-67 were prepared under hydrothermal (120 °C) and non-hydrothermal (room temperature) from various cobalt sources and 2-methylimidazolate (Hmim) in aqueous solution within 30 min. The particle size and morphology were found to be related to the reactivity of the cobalt salt, Hmim/Co2+ molar ratios and experimental condition. Using Co(NO3)2 as cobalt source, small-sized ZIF-67 crystals with agglomeration were formed. For CoCl2, small-sized rhombic dodecahedron were obtained. While large-sized crystals of rhombic dodecahedron structure were obtained from CoSO4 and Co(OAc)2. Under hydrothermal condition, the size of ZIF-67 crystals tended to be more uniform and the morphology were more regular comparing to non-hydrothermal condition. This study provides a simple way to control the size and morphology of ZIF-67 crystals prepared in aqueous solution. © 2015 Elsevier Inc. All rights reserved.

Yan K.,Nanjing Southeast University | Sun Y.,Nanjing Southeast University | Sun Y.,Jiangsu Key Laboratory of Advanced Metallic Materials | Bai J.,Nanjing Southeast University | And 3 more authors.
Jinshu Xuebao/ Acta Metallurgica Sinica | Year: 2010

Using a 3D rotary-die equal-channel angular pressing (3D-RD ECAP) mold, the commercial wrought magnesium alloy AZ31 has been processed through 4 routes (A', B'A, B'c and C') and microstructures as well as mechanical properties of the samples processed were investigated. The results reveal that all the 4 routes can refine microstructures of the alloy, however, the effects on microstructural homogeneity and tensile elongations of the samples are different. The grain sizes of the samples processed through routes A' or B'A are more uniform and their tensile elongations at ambient temperature are also higher than those through B'C or C' routes. The distributions of hardness on the central longitudinal planes of samples extruded through different routes are well consistent with the microstructural characters at the corresponding positions. Strain analysis on the cubic elements in the samples reveals the limitation of the traditional shear mode for ECAP. Based on experimental results and finite element method (FEM) simulation, the deformation homogeneity caused by ECAP processing is closely related to the alternative action of tensile and compressive stresses at the different positions in the samples and is independent of the deformation regularity of the cubic elements in the shear model proposed in the previous studies. © Copyright.

Li X.,Nanjing Southeast University | Huang H.,Nanjing Southeast University | Zhu Y.,Nanjing Southeast University | Zhao H.,Nanjing Southeast University | And 2 more authors.
RSC Advances | Year: 2015

A highly selective chemodosimeter based on 1,8-naphthalimide for Pd2+/4+ species via a Claisen rearrangement was developed, which not only discriminated Pd from competing Pt species, but also distinguished Pd in an oxidized state without altering its oxidation states from Pd0. Under optimized reaction conditions, the detection limit can reach 1.4 μM for Pd2+. © The Royal Society of Chemistry 2016.

Tian F.,Nanjing Southeast University | Xie Y.,Nanjing Southeast University | Xie Y.,Suzhou University | Xie Y.,Jiangsu Key Laboratory of Advanced Metallic Materials
Journal of Nanoparticle Research | Year: 2015

Lithium manganese oxide intercalation compound (Li0.7MnO2) supported on titanium nitride nanotube array (TiN NTA) was applied as cathode electrode material for lithium-ion supercapacitor application. Li0.7MnO2/TiN NTA was fabricated through electrochemical deposition and simultaneous intercalation process using TiN NTA as a substrate, Mn(CH3COO)2 as manganese source, and Li2SO4 as lithium source. The morphology and microstructure of the Li0.7MnO2/TiN NTA were characterized by scanning electron microscopy and X-ray diffraction analysis. The electrochemical performance of the Li0.7MnO2/TiN NTA was investigated by electrochemical impedance spectroscopy, cyclic voltammetry, and galvanostatic charge/discharge measurements. Li0.7MnO2/TiN NTA exhibited higher capacitive performance in Li2SO4 electrolyte solution rather than that in Na2SO4 electrolyte solution, which was due to the different intercalation effects of lithium-ion and sodium-ion. The specific capacitance was improved from 503.3 F g−1 for MnO2/TiN NTA to 595.0 F g−1 for Li0.7MnO2/TiN NTA at a current density of 2 A g−1 in 1.0 M Li2SO4 electrolyte solution, which was due to the intercalation of lithium-ion for Li0.7MnO2. Li0.7MnO2/TiN NTA also kept 90.4 % capacity retention after 1000 cycles, presenting a good cycling stability. An all-solid-state lithium-ion supercapacitor was fabricated and showed an energy density of 82.5 Wh kg−1 and a power density of 10.0 kW kg−1. © 2015, Springer Science+Business Media Dordrecht.

Mao Y.,Nanjing Southeast University | Mao Y.,Jiangsu Key Laboratory of Advanced Metallic Materials | Dong Y.,Nanjing Southeast University | Dong Y.,Jiangsu Key Laboratory of Advanced Metallic Materials | And 8 more authors.
Materials Science and Engineering C | Year: 2011

A recently developed process of microsphere preparation, named droplet-freezing process is introduced in this paper. The PLLA microspheres were fabricated by the droplet-freezing process, the diameter and porosity of the microspheres were measured, and the micro-morphologies of the microspheres were characterized by scanning electron microscopy (SEM). The formation process of microspheres was achieved by two steps: first, after droplets dropped off the delivery tube, they became approximately spherical in the air under the effect of the surface tension; second, droplets dropped into liquid condensate and maintained the spherical shape, and were frozen during the free settling process. Experimental results indicated that the microspheres fabricated by the droplet-freezing process have uniform diameters and the diameter can be controlled properly, along with the increase of the PLLA concentration, the size of microspheres increases, but the porosity of the microspheres decreases. The microspheres with high porosity can be obtained with a low concentration of the PLLA solution. SEM analysis revealed that the surfaces and interiors of the microsphere contain plentiful and interconnected micro pores. The microspheres are hopeful to be applied in bone tissue engineering. © 2009 Elsevier B.V. All rights reserved.

Wang Z.,Nanjing Southeast University | Wang Z.,Jiangsu Key Laboratory of Advanced Metallic Materials | Yang J.,Nanjing Southeast University | Jiang Y.,Nanjing Southeast University | And 4 more authors.
Analytical Methods | Year: 2015

To overcome the problem of non-specific silver precipitation occurring in the traditional silver staining, this work presents a new strategy for signal amplification by labeling the biological molecule with Pd/GO nanoparticles (NPs), which further act as catalysts to reduce copper ions to metallic copper to enhance the signal (denoted as "Pd/GO label copper stain" later). Based on this strategy, the electrochemical detection of a single-base mutation associated with the breast cancer gene TOX3 is specially studied by employing differential pulse voltammetry (DPV). The analytical performance of this system shows that after 15 min of copper staining there is a linear relationship between the peak current resulting from the oxidative dissolution of the copper deposit and the logarithm of the target DNA concentration in the range of 10 μM to 1 pM. The limit of detection can reach 1 pM, which benefits from the high catalytic activity of Pd/GO NPs along with a low background level of "Pd/GO label copper stain". Therefore, this process can be expected to be a good alternative to silver staining used in nanomaterial-based signal amplification strategies in future. © 2015 The Royal Society of Chemistry.

Zhan L.,Nanjing Southeast University | Zhan L.,Jiangsu Key Laboratory of Advanced Metallic Materials | Zhang Y.,Nanjing Southeast University | Zhang Y.,Jiangsu Key Laboratory of Advanced Metallic Materials | And 8 more authors.
Journal of Alloys and Compounds | Year: 2016

The ternary Mg67-xPdxCo33 (x = 1, 3, 5, 7) alloys were prepared and served as anode materials for the Ni-MH battery system. Pd facilitates the formation of a full body-centered cubic (BCC) phase in binary Mg67Co33. All Mg67-xPdxCo33 (x = 1, 3, 5, 7) alloys possess BCC structure in nano-crystalline, which were observed by XRD and TEM analyses. In addition, their lattice parameters increase with the augmentation of Pd content. The charge-discharge experiments show that Mg64Pd3Co33 owns the maximum discharge capacity of 624 mAh g-1 among Mg67-xPdxCo33 (x = 1, 3, 5, 7) electrodes, which was greatly enhanced from our previously studied binary Mg-Co and ternary Mg-Co-Pd electrodes. All electrochemical kinetics e.g. exchange current density, hydrogen atomic diffusion capability were improved by substituting Pd for Mg, which were also relevant with the increment of Pd amount in the alloys. X-ray photoelectric spectroscopy (XPS) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) demonstrated that Pd relieved the severe corrosions and capacity degradations of the electrodes. © 2015 Elsevier B.V. All rights reserved.

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