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

Manickam Minakshi, David R. G. Mitchell, Anji Munnangi Orcid Logo, Anders J. Barlow, Maximilian Fichtner

Nanoscale, Volume: 10, Issue: 27, Pages: 13277 - 13288

Swansea University Author: Anji Munnangi Orcid Logo

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DOI (Published version): 10.1039/c8nr03824d

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 diff...

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Published in: Nanoscale
ISSN: 2040-3364 2040-3372
Published: Royal Society of Chemistry (RSC) 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa51571
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spelling 2019-09-03T11:52:10.9095984 v2 51571 2019-08-27 New insights into the electrochemistry of magnesium molybdate hierarchical architectures for high performance sodium devices 3ed0b4f2ff4fb9e87c7a73e7a3c39da7 0000-0001-9101-0252 Anji Munnangi Anji Munnangi true false 2019-08-27 MTLS 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. Journal Article Nanoscale 10 27 13277 13288 Royal Society of Chemistry (RSC) 2040-3364 2040-3372 12 6 2018 2018-06-12 10.1039/c8nr03824d COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2019-09-03T11:52:10.9095984 2019-08-27T12:18:12.6931823 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Manickam Minakshi 1 David R. G. Mitchell 2 Anji Munnangi 0000-0001-9101-0252 3 Anders J. Barlow 4 Maximilian Fichtner 5 0051571-03092019115204.pdf minakshi2018.pdf 2019-09-03T11:52:04.0570000 Output 7485160 application/pdf Accepted Manuscript true 2019-09-03T00:00:00.0000000 true eng
title New insights into the electrochemistry of magnesium molybdate hierarchical architectures for high performance sodium devices
spellingShingle New insights into the electrochemistry of magnesium molybdate hierarchical architectures for high performance sodium devices
Anji Munnangi
title_short New insights into the electrochemistry of magnesium molybdate hierarchical architectures for high performance sodium devices
title_full New insights into the electrochemistry of magnesium molybdate hierarchical architectures for high performance sodium devices
title_fullStr New insights into the electrochemistry of magnesium molybdate hierarchical architectures for high performance sodium devices
title_full_unstemmed New insights into the electrochemistry of magnesium molybdate hierarchical architectures for high performance sodium devices
title_sort New insights into the electrochemistry of magnesium molybdate hierarchical architectures for high performance sodium devices
author_id_str_mv 3ed0b4f2ff4fb9e87c7a73e7a3c39da7
author_id_fullname_str_mv 3ed0b4f2ff4fb9e87c7a73e7a3c39da7_***_Anji Munnangi
author Anji Munnangi
author2 Manickam Minakshi
David R. G. Mitchell
Anji Munnangi
Anders J. Barlow
Maximilian Fichtner
format Journal article
container_title Nanoscale
container_volume 10
container_issue 27
container_start_page 13277
publishDate 2018
institution Swansea University
issn 2040-3364
2040-3372
doi_str_mv 10.1039/c8nr03824d
publisher Royal Society of Chemistry (RSC)
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
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description 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.
published_date 2018-06-12T04:03:30Z
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score 11.035655

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