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Li H.-Y.,Chongqing University | Li H.-Y.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization | Jiao K.,Chongqing University | Wang L.,Chongqing University | And 3 more authors.
Journal of Materials Chemistry A | Year: 2014

A micelle-anchoring method has been developed for the in situ synthesis of V2O3 nanoflakes@C core-shell composites as the electrode materials in supercapacitors. Hexadecyltrimethylammonium bromide (CTAB) micelles assembled to solubilize activated carbon and anchor vanadate ions of the precursor, NH4VO3, onto the carbon surface. During drying and calcination, CTAB and NH4VO3 decompose to produce V2O5, which is carbon-thermally reduced to V2O3in situ. In the as-obtained composites, monodisperse V2O3 nanoflakes stand edge-on the carbon surface, forming a carbon core with a shell layer of edge-on standing V2O3 nanoflakes. Because of the increased electric conductivity and high specific surface area, V2O3 nanoflakes@C composites exhibit a specific capacitance of 205 F g-1 at 0.05 A g-1 over a potential range of -0.4 to 0.6 V, which surpasses those of their individual counterparts (67 F g-1 and 159 F g-1 at 0.05 A g-1 for activated carbon and bulk V2O3, respectively). The composites also showed good cycling stability due to structure support of the inner carbon cores. The proposed method provides a novel strategy to synthesize composites of transition-metal oxides with improved electrochemical performance for applications in supercapacitors. © 2014 the Partner Organisations.

Wang Y.J.,CAS Chengdu Institute of Biology | Wang Y.J.,Environmental Microbiology Key Laboratory of Sichuan Province | Li D.P.,CAS Chengdu Institute of Biology | Li D.P.,Environmental Microbiology Key Laboratory of Sichuan Province | And 5 more authors.
Journal of Industrial Microbiology and Biotechnology | Year: 2014

Liquid phase oxidation process using chelated iron solution is among the most promising techniques for the hydrogen sulfide removal due to its double advantage of waste minimization and resource recovery. Regeneration of chelated iron is a core reaction in this process. Regeneration of chelated iron in acidic solution is very difficult. In this paper, a novel regeneration of iron citrate in acidic solution by biooxidation of iron-oxidizing bacteria was reported firstly. By using such a process, the influence of iron-oxidizing bacteria on the regeneration rate was investigated. The results demonstrated the regeneration rate with the new technology was increased significantly. The process may contribute to the biooxidation of iron-oxidizing bacteria. Application of this novel process increased the regeneration rate under the optimum conditions, suggesting the iron citrate regeneration process may be a feasible and economical method in application. © 2014, Society for Industrial Microbiology and Biotechnology.

Xu B.-P.,Pangang Group Co. | Xu B.-P.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization
Yejin Fenxi/Metallurgical Analysis | Year: 2013

In strict accordance with the GB/T6379.2-2004 standard, a number of laboratories were coordinated to conduct precision tests for the determination of TiO2 in iron ore by ferric ammonium sulfate titrimetry. The data consistency and outliers were investigated with Mandel, Cochran, Grubbs and Dixon test methods, and the precision test data underwent statistical calculations with the EXCEL calculation tool to determine the functional relationship of precision for the analytical method. With repeatability r and reproducibility R, the inner-laboratory and inter-laboratory precision of the analytical method were truthfully and objectively reflected.

Yan B.-L.,Harbin Engineering University | Yan B.-L.,Pangang Group Co. | Yan B.-L.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization | Yan Y.-D.,Harbin Engineering University | And 3 more authors.
Journal of the Electrochemical Society | Year: 2016

This paper exhibits a novel method to prepare the Ti-Al intermetallic compounds on the liquid aluminum electrode at 1123 K in NaCl-KCl-TiCl3 melts. The electrochemical behavior of Ti ions on a molybdenum electrode in NaCl-KCl-TiCl3 melts was investigated by different electrochemical measurements. The results from transient electrochemical techniques show that Ti3+ ions are reduced to Ti metal by a two-step mechanism involving exchanges of one and two electrons. According to convolution calculation results, electrochemical reduction process of the Ti ion is a one or two-step reversible reduction process. Binary alloy Ti-Al was prepared by potentiostatic electrolysis, and the TiAl3 and TiAl2 intermetallic compounds were identified via X-ray diffraction (XRD). The microstructure and micro-zone chemical analysis of Ti-Al alloy were accomplished by scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS) in this study. The mineral liberation analyzer (MLA) observations of the formation of a Ti alloy demonstrate that this synthetic method for Ti-Al alloys is practical and feasible. © 2016 The Electrochemical Society.

Li H.-Y.,Chongqing University | Li H.-Y.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization | Wang L.,Chongqing University | Wei C.,Chongqing University | And 2 more authors.
Materials Technology | Year: 2015

Ultralong (NH4)2V6O16·1.5H2O nanobelts were synthesised by a combination of sol-gel and hydrothermal methods. The chemical composition, morphology and microstructure of products were characterised by X-raypowderdiffraction, Fourier transform infrared spectroscopy, field emissionSEM and TEM respectively. Typical (NH4)2V6O16·1.5H2Onanobelts are several hundreds of micrometres in length, 502100 nm in thickness and 2002500 nm in width. It is indicated that SO2-4 ions are critical to the formation of ultralong nanobelts. Electrochemical performance shows that (NH4)2V6O16·1.5H2O nanobelts can exhibit a specific capacitance as high as 220 F g-1 at 0.05 A g-1 over a potential range of 20.1-0.9 V in 1MNaNO3 due to their high conductivity and ion diffusion rate. Thiswork provides new insights for the growth of ultralong NH4V3O8 nanobelts and their application in supercapacitors. © 2015 W. S. Maney & Son Ltd.

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