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Title: Superior Li-ion storage of VS4 nanowires anchored on reduced graphene
Authors: Yang, Guang
Wang, Huanhuan
Zhang, Bowei
Foo, Shini
Ma, Mingbo
Cao, Xun
Liu, Jilei
Ni, Shibing
Srinivasan, Madhavi
Huang, Yizhong
Keywords: Engineering::Materials
Issue Date: 2019
Source: Yang, G., Wang, H., Zhang, B., Foo, S., Ma, M., Cao, X., Liu, J., Ni, S., Srinivasan, M. & Huang, Y. (2019). Superior Li-ion storage of VS4 nanowires anchored on reduced graphene. Nanoscale, 11(19), 9556-9562.
Project: M4011528 
Journal: Nanoscale 
Abstract: Research on VS4 is lagging due to the difficulty in its tailored synthesis. Herein, unique architecture design of one-dimensional VS4 nanowires anchored on reduced graphene oxide is demonstrated via a facile solvothermal synthesis. Different amounts of reduced graphene oxide with VS4 are synthesized and compared regarding their rate capability and cycling stability. Among them, VS4 nanowires@15 wt% reduced graphene oxide present the best electrochemical performance. The superior performance is attributed to the optimal amount of reduced graphene oxide and one-dimensional VS4 nanowires based on (i) the large surface area that could accommodate volume changes, (ii) enhanced accessibility of the electrolyte, and (iii) improvement in electrical conductivity. In addition, kinetic parameters derived from electrochemical impedance spectroscopy spectra and sweep rate dependent cyclic voltammetry curves such as charge transfer resistances and Li+ ion apparent diffusion coefficients both support this claim. The diffusion coefficient is calculated to be 1.694 × 10-12 cm2 s-1 for VS4 nanowires/15 wt% reduced graphene oxide, highest among all samples.
ISSN: 2040-3364
DOI: 10.1039/c9nr01953g
Rights: © 2019 The Royal Society of Chemistry. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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