Vertically aligned mixed V 2O 5-TiO 2 nanotube arrays for supercapacitor applications
ABSTRACT Highly ordered mixed V 2O 5-TiO 2 nanotubes can be formed by self-organizing anodization of Ti-V alloys with vanadium content of up to 18 at%. In the resulting oxide nanotube arrays, the vanadium is electrochemically switchable leading to a specific capacitance that can reach up to 220 F g -1 and an energy density of 19.56 Wh kg -1 with perfect reversibility and long-term stability. Thus these mixed oxide nanotubes may be considered as a promising candidate for supercapacitors. © 2011 The Royal Society of Chemistry.
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- "The results demonstrate, that alkaline metal ions indeed participate in the redox reaction of MnO 2 . V 2 O 5 , because of its high energy density, low cost, and capability of fast charge–discharge, is another promising candidate material for both lithium ion batteries and supercapacitors      . In aqueous electrolyte solutions, V 2 O 5 has been reported to exhibit the highest capacitance in KCl solution compared with other solutions of e.g. "
ABSTRACT: The electrochemical behavior of V2O5·0.6H2O nanoribbons in 0.5 mol/L Li2SO4, Na2SO4, and K2SO4 aqueous solutions is compared. The electrochemical reaction of V2O5·0.6H2O in these neutral aqueous electrolyte solutions was elucidated by analyzing the different electrochemical behavior, structural and composition changes of V2O5·0.6H2O electrodes during charge/discharge. Results show, that V2O5·0.6H2O exhibits the largest specific capacity in K2SO4 electrolyte attributed to the most facile intercalation/deintercalation of K+-ions into/from the interlayer space of V2O5·0.6H2O.Electrochimica Acta 04/2013; 96:8–12. DOI:10.1016/j.electacta.2013.02.078 · 4.50 Impact Factor
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ABSTRACT: Straight to Ti-V movie: Binary oxide mesosponge layers were fabricated by self-organizing anodization of Ti-V alloys. The etched mesosponge layers exhibit a specific capacitance of 100-130 F g -1, with perfect reversibility and long-term stability. Such mesosponge structures greatly facilitate ion transport during rapid charge/discharge processes. Ti-V binary oxide mesosponge layers are promising candidates for applications in energy-storage devices. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Chemistry - An Asian Journal 11/2011; 6(11):2916-9. DOI:10.1002/asia.201100488 · 3.94 Impact Factor
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ABSTRACT: Hollow flowers-like V6O13 with an average size of 3μm was successfully synthesized via a facile sol-hydrothermal approach in a short time. The surface composition, crystalline components and morphology of V6O13 were characterized by X-ray photoelectron spectra (XPS), powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements, respectively. An intercalating-exfoliating-self-assembly model was proposed to explain the formation process of hollow-flower structure based on experimental results. The obtained hollow flowers-like V6O13 exhibits high specific capacitance, good cyclability and low resistance as revealed by analysis of cyclic voltammetry (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS). Experimental results also indicate that hollow flowers-like V6O13 can deliver a capacitance of 417Fg−1 at a scan rate of 5mVs−1. This value would decrease to 400Fg−1 after 1000 cycles in potential range from 0 to 0.8V versus saturated calomel electrode (SCE) in 1molL−1 NaNO3 aqueous electrolyte at pH of 2.Journal of Alloys and Compounds 12/2011; 509(41):10080-10085. DOI:10.1016/j.jallcom.2011.08.042 · 2.73 Impact Factor