New insights into the electrochemistry of magnesium molybdate hierarchical architectures for high performance sodium devices

M. Minakshi; D.R.G. Mitchell; A.R. Munnangi; A.J. Barlow; M. Fichtner

doi:10.1039/c8nr03824d

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New insights into the electrochemistry of magnesium molybdate hierarchical architectures for high performance sodium devices

Journal article

Peer reviewed

New insights into the electrochemistry of magnesium molybdate hierarchical architectures for high performance sodium devices

M. Minakshi, D.R.G. Mitchell, A.R. Munnangi, A.J. Barlow and M. Fichtner

Nanoscale, Vol.10(27), pp.13277-13288

2018

DOI: https://doi.org/10.1039/c8nr03824d

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Abstract

Magnesium molybdate (MgMoO4), which possesses synergistic features combining both hierarchical plate-like nanomaterials and porous architectures, has been successfully synthesized through a facile combustion synthesis at a low temperature. The hierarchical architecture is characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), scanning transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) analyses. The as-obtained MgMoO4 nanoplates showed a porous structure with a pore-size distribution ranging from 50 to 70 nm. This porosity provides an electron transport pathway and enhanced surface reaction kinetics. The binding energies measured for Mg 2p, Mo 3d, 3p and O 1s are consistent with the literature, and with the metal ions being present as M(II) and M(VI) states, respectively. This indicates that the oxidation states of the metal cations are as expected. The electrochemical behaviour of MgMoO4 was investigated using aqueous (NaOH) and non-aqueous solvents (NaClO4 in EC : DMC : FEC) for supercapacitor and battery applications. The sodium-ion capacitor involves ion absorption and insertion into the MgMoO4 electrodes resulting in superior power and energy densities. However, the cycling stability was found to be stable only for an aqueous system. The formation of a solid electrolyte surface layer restricted the reversible capacity of the MgMoO4 in the sodium-battery. Nevertheless, it does offer some promise as an anode material for storing energy with high rate performance and excellent capacity retention. Detailed comparative analyses of various electrolytes in storage devices such as hybrid sodium-ion capacitors and sodium-ion batteries are vital for the integration of hierarchical structured materials into practical applications. The reaction mechanisms are postulated.

Details

Title: New insights into the electrochemistry of magnesium molybdate hierarchical architectures for high performance sodium devices
Authors/Creators: M. Minakshi (Author/Creator) - Murdoch University
D.R.G. Mitchell (Author/Creator) - University of Wollongong
A.R. Munnangi (Author/Creator)
A.J. Barlow (Author/Creator) - La Trobe University
M. Fichtner (Author/Creator) - Helmholtz-Institute Ulm
Publication Details: Nanoscale, Vol.10(27), pp.13277-13288
Publisher: Royal Society of Chemistry
Identifiers: 991005542250907891
Murdoch Affiliation: School of Engineering and Information Technology
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.62 Electrochemistry; 2.62.52 Electrode Materials
Web Of Science research areas: Chemistry, Multidisciplinary; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Physics, Applied
ESI research areas: Physics