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Microwave-assisted hydrothermal synthesis and electrochemical studies of α- and h-MoO3

Two modifications of molybdenum trioxide with orthorhombic (α-MoO3) and hexagonal (h-MoO3) crystal structure have been synthesized by a microwave-assisted hydrothermal method, facilitated by formic acid. Characterization by means of X-ray diffraction, scanning electron microscopy, specific surface a...

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Bibliographic Details
Main Authors: Zakharova, Galina S. (Author) , Schmidt, Christina (Author) , Ottmann, Alexander (Author) , Mijowska, Ewa (Author) , Klingeler, Rüdiger (Author)
Format: Article (Journal)
Language:English
Published: 23 August 2018
In: Journal of solid state electrochemistry
Year: 2018, Volume: 22, Issue: 12, Pages: 3651-3661
ISSN:1433-0768
DOI:10.1007/s10008-018-4073-1
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/s10008-018-4073-1
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Author Notes:Galina S. Zakharova, Christina Schmidt, Alexander Ottmann, Ewa Mijowska, Rüdiger Klingeler
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Summary:Two modifications of molybdenum trioxide with orthorhombic (α-MoO3) and hexagonal (h-MoO3) crystal structure have been synthesized by a microwave-assisted hydrothermal method, facilitated by formic acid. Characterization by means of X-ray diffraction, scanning electron microscopy, specific surface analysis, and Fourier-transform infrared, Raman, and UV-Vis spectroscopy reveals phase-pure crystalline powder samples of hexagonal h-MoO3 microrods and of α-MoO3 nanobelt bundles, respectively. The electrochemical properties of the MoO3 compounds, studied by cyclic voltammetry and galvanostatic cycling vs. Li/Li+, strongly depend on the structure and the applied potential range. In the range of 1.5-3.5 V, Li+-ions can be reversibly intercalated into the α-MoO3 nanobelts. Utilizing the material in this way as intercalation cathode material yields an initial discharge capacity of 295 mA h g−1 at 100 mA g−1 and comparably moderate capacity fading of 25% between cycles 20 and 100. Extending the potential range to 0.01-3.0 V induces the conversion reaction to Mo, which for both modifications yields high initial capacities of around 1500 mA h g−1 but is associated with much stronger capacity fading.
Item Description:Im Titel ist die Zahl 3 tiefgestellt
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Physical Description:Online Resource
ISSN:1433-0768
DOI:10.1007/s10008-018-4073-1

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