12017-13-9Relevant articles and documents
A general solvothermal route to the synthesis of CoTe, Ag2Te/Ag, and CdTe nanostructures with varied morphologies
Jiang, Ling,Zhu, Ying-Jie
, p. 1238 - 1243 (2010)
A general and facile surfactant-assisted solvothermal route was developed, for the synthesis of CoTe, Ag2Te/Ag, and CdTe nanostructures using the corresponding metal salt, Na2TeO3, ascorbic acid, and polyvinyl pyrrolidone (PVP) or cetyltrimethylammonium bromide (CTAB) in mixed solvents of ethanolamine and water. It was also found that the morphology of the product varied dramatically when using different surfactants such as PVP and CTAB. A formation mechanism, of telluride nanostructures was proposed. The products were characterized, by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), thermogravimetry (TG), and differential scanning calorimetric (DSC) analysis.
Improved performance of a CoTe//AC asymmetric supercapacitor using a redox additive aqueous electrolyte
Ye, Beirong,Gong, Chao,Huang, Miaoliang,Tu, Yongguang,Zheng, Xuanqing,Fan, Leqing,Lin, Jianming,Wu, Jihuai
, p. 7997 - 8006 (2018)
Cobalt telluride (CoTe) nanosheets as supercapacitor electrode materials are grown on carbon fiber paper (CFP) by a facile hydrothermal process. The CoTe electrode exhibits significant pseudo-capacitive properties with a highest Cm of 622.8 F g-1 at 1 A g-1 and remarkable cycle stability. A new asymmetric supercapacitor (ASC) is assembled based on CoTe (positive electrode) and activated carbon (negative electrode), which can expand the operating voltage to as high as 1.6 V, and has a specific capacitance of 67.3 F g-1 with an energy density of 23.5 W h kg-1 at 1 A g-1. The performance of the ASC can be improved by introducing redox additive K4Fe(CN)6 into alkaline electrolyte (KOH). The results indicate that the ASC with K4Fe(CN)6 exhibits an ultrahigh specific capacitance of 192.1 F g-1 and an energy density of 67.0 W h kg-1, which is nearly a threefold increase over the ASC with pristine electrolyte.
Regularities of thermal decay of carbonyl chalcogenide metal clusters
Pasynskii,Dobrokhotova,Torubaev,Semenova,Novotortsev
, p. 109 - 115 (2003)
The thermal decay of 19 individual carbonyl homo- and heterochalcogenide clusters with different M/X ratios (M = Fe, Mn, Pt, Cr, W, Mo, Re, Ru; X = S, Se, Te) was studied by differential scanning calorimetry and thermogravimetry. The process is stepwise a
Structure, density, and microhardness of Co1- xNixTe (0 < x < 1) solid solutions
Makovetskii,Vas'kov,Yanushkevich
, p. 108 - 110 (2002)
Co1-xNixTe (0 a continuous series of solid solutions was confirmed by density and microhardness measurements.
Synthesis of uniform CoTe and NiTe semiconductor nanocluster wires through a novel coreduction method
Peng, Qing,Dong, Yajie,Li, Yadong
, p. 2174 - 2175 (2003)
A novel coreduction method was developed to synthesize uniform one-dimensional CoTe and NiTe nanocluster wires. In the synthesis, soluble Na2TeO3 was used to supply a highly reactive Te source and N2H4·H2O was used both as reducing agent and as complexing agent. The as-prepared samples were characterized by XRD, TEM, and HRTEM. The probable formation mechanism of the nanowires is discussed.
Crystal structure determination of CoGeTe from powder diffraction data
Laufek,Navrátil,Plá?il,Plechá?ek
, p. 155 - 159 (2008)
The crystal structure of cobalt germanium telluride CoGeTe has been determined by direct methods using integrate intensities of conventional X-ray powder diffraction data and subsequently refined with the Rietveld method. The title compound was prepared by heating of stoichiometric amount of Co, Ge and Te in silica glass tube at 670 °C. CoGeTe adopts orthorhombic symmetry, space group Pbca with unit cell parameters a = 6.1892(4) A?, b = 6.2285(4) A?, c = 11.1240(6) A?, V = 428.8(1) A?3 and Z = 8. Its crystal structure is formed by [CoGe3Te3] octahedra sharing both edges and corners. CoGeTe represents a ternary ordered variant of α-NiAs2 type structure. An important feature present in CoGeTe is an occurrence of short Co-Co distance across the shared edge of [CoGe3Te3] octahedra. Differential thermal analysis (DTA) has revealed that CoGeTe melts incongruently at about 725 °C; CoGeTe decomposes into GeTe, CoGe and CoTe2. Temperature dependence of the electrical conductivity and value of Seebeck coefficient at 300 K are also reported.
The use of phosphine chalcogenides in the preparation of cobalt chalcogenides
Stuczynski, S. M.,Kwon, Y.-U.,Steigerwald, M. L.
, p. 167 - 172 (1993)
Dicobalt octacarbonyl reacts with TePnBu3, SePnBu3 or SPnBu3 to give solid state cobalt telluride, cobalt selenide and cobalt sulfide, respectively.In each case a cluster compound of the form Co6E8 (PnBu3)6 can be isolated from the reaction of the phosphine chalcogenide with cobalt carbonyl, and subsequently carried on to the solid state product.In this sense the Co6E8 clusters are intermediates in the molecules-to-solids processes.In the case of Se, another Co/Se cluster can be isolated: Co4Se2(CO)6)PnBu3)4.This complex also fits into the molecules-to-solids pathway inasmuch as it arises from Co2(CO)8 and SePnBu3, and it is converted to the Co6Se8 cluster when treated with phosphine selenide.These results show that molecules-to-solids pathways originally uncovered in studying reactions of TePEt3 can be extended to other trialkylphosphines and other chalcogens.
