Key Laboratory of Ministry of Education for Non ferrous Materials Science and Engineering

Changsha, China

Key Laboratory of Ministry of Education for Non ferrous Materials Science and Engineering

Changsha, China

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Wu Z.,Central South University | Wu Z.,Key Laboratory of Ministry of Education for Non ferrous Materials Science and Engineering | Xie L.,Central South University | Xiao Y.,Central South University | And 2 more authors.
Journal of Alloys and Compounds | Year: 2017

A simple and facile silver mirror reaction is introduced to wrap MoS2 nanosheets with highly conductive Ag. With the assistance of Ag, the electron transfer ability of the MoS2 matrix is enhanced, leading to outstanding electrochemical storage ability. The influence of Ag content is also investigated. It is found that the optimized mole ratio of Ag: MoS2 is 1: 8, resulting in the maximal specific capacitance of 980 F g−1 at 1 A g−1. Moreover, the cycling stability is also very good with a high retention of 97% for 5000 cycles. Therefore, the obtained Ag@MoS2 hybrid shows potential applications in the supercapacitors. The current strategy also paves a way for the design and optimization of MoS2-based materials for other applications in lithium battery, electrochemical and photo-electrochemical catalysts. © 2017 Elsevier B.V.


Wang D.,Central South University | Wang D.,Key Laboratory of Ministry of Education for Non ferrous Materials Science and Engineering | Zhang X.,Central South University | Bao S.,Central South University | And 4 more authors.
Journal of Materials Chemistry A | Year: 2017

Molybdenum disulfide (MoS2) has attracted much attention as a promising electrocatalyst for the hydrogen evolution reaction (HER). Although tremendous efforts have been made to enhance the HER performance of MoS2, the functional design of its intrinsic structures still remains challenging. In this work, a highly active and stable multiphasic catalyst (1T/2H MoS2) is developed through a facile hydrothermal route, in which the 1T phase is induced by the intercalation of guest ions and molecules, and the concentration of the 1T phase can be controlled by adjusting the preparation temperature. The existence of the 1T phase provides more active sites and better conductivity for the HER, resulting in an excellent activity with a small Tafel slope of 46 mV dec−1. More importantly, the integration with the 2H phase is beneficial to the stabilization of the metastable 1T phase, ensuring the excellent durability of 1T/2H MoS2. © The Royal Society of Chemistry.


Wang Y.,Key Laboratory of Ministry of Education for Non ferrous Materials Science and Engineering | Wang Y.,Key Laboratory of Hunan Province for Metallurgy and Material Processing of Rare Metals | Wang Y.,Central South University | Wang D.,Key Laboratory of Ministry of Education for Non ferrous Materials Science and Engineering | And 9 more authors.
International Journal of Refractory Metals and Hard Materials | Year: 2012

2.0 wt.% MoSi 2/rare earth oxide doped molybdenum alloys were prepared by powder metallurgy processing followed by hot rolling processing and final stress relieving processing. Microstructure of molybdenum alloys shows elongated structure and fine distributions of composite particle. Compared with unalloyed molybdenum, the addition of MoSi 2/rare earth oxide causes great improvement in the mechanical properties of molybdenum, especially its tensile strength at high temperature. © 2011 Published by Elsevier Ltd. All rights reserved.


Wang Y.,Key Laboratory of Ministry of Education for Non ferrous Materials Science and Engineering | Wang Y.,Key Laboratory of Hunan Province for Metallurgy and Material Processing of Rare Metals | Wang Y.,Central South University | Wang D.,Key Laboratory of Ministry of Education for Non ferrous Materials Science and Engineering | And 9 more authors.
Materials Science and Engineering A | Year: 2012

The effect of MoSi 2/La 2O 3/Y 2O 3 (SiLY) composite particle on microstructure and mechanical properties of sintered molybdenum was surveyed in this research. The SiLY was obtained by mechanical milling and then doped into molybdenum by the solid-solid method. The sintered molybdenum (MSiLY) with the addition of SiLY was prepared via the process of powder metallurgy. X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), optical microscope (OM), scanning electron microscopy (SEM), mechanical properties' testing were carried out to characterize the samples. The EDS results showed that elements of the SiLY in sintered molybdenum are composed of O, La, Si, Y and Mo. Microstructural observations showed that the MSiLY has a fine equiaxed grain, and SiLY dispersively distributed in grain interior and at grain boundary. Mechanical properties of sintered molybdenum have been improved significantly by the addition of SiLY. The fine grain structure and the particles distributed in the matrix can improve strength and toughness of sintered molybdenum. © 2012 Elsevier B.V.


Wang D.,Central South University | Wang D.,Key Laboratory of Ministry of Education for Non ferrous Materials Science and Engineering | Zhang D.,Central South University | Tang C.,Central South University | And 4 more authors.
Catalysis Science and Technology | Year: 2016

Co-promoted molybdenum phosphide nanoparticles have been successfully prepared and explored for the first time as a cost-effective electrocatalyst for hydrogen evolution reaction (HER). The as-developed catalyst demonstrates excellent HER activity with a small Tafel slope of 50 mV dec-1 which is among the best records reported for MoP-based catalysts. The addition of Co not only reduces the particle size of the MoP-based catalyst and promotes the charge transfer, but also enhances the intrinsic activity of each active site, paving the way for optimizing the HER performances of ternary or multiple transition metal phosphide catalysts. © The Royal Society of Chemistry 2016.


Wang D.,Central South University | Wang D.,Key Laboratory of Ministry of Education for Non ferrous Materials Science and Engineering | Zhang X.,Central South University | Shen Y.,Central South University | And 2 more authors.
RSC Advances | Year: 2016

The replacement of Pt with cheap metal electrocatalysts with high efficiency and superior stability for the hydrogen evolution reaction (HER) remains a great challenge. Furthermore, the optimization of MoS2 electrocatalysts has attracted much attention. In this work, we report a simple strategy to enhance the HER ability of MoS2 catalysts via the doping of nickel. With the doping of a small amount of nickel, the MoS2 catalyst shows more electrochemical active sites, higher turnover frequency over each active site and better conductivity, resulting in excellent HER activity with a small Tafel slope of 47 mV dec-1, making it a promising HER electrocatalyst for practical applications. © The Royal Society of Chemistry 2016.

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