Low humid transport of anions in layered double hydroxides membranes using polydopamine coating

Abdollahzadeh, M; Hosseini, E; Ahmadi, H; Lim, S; Korayem, AH; Razmjou, A; Asadnia, M

Low humid transport of anions in layered double hydroxides membranes using polydopamine coating

Abdollahzadeh, M Hosseini, E Ahmadi, H Lim, S Korayem, AH Razmjou, A Asadnia, M

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Publisher:: ELSEVIER
Publication Type:: Journal Article
Citation:: Journal of Membrane Science, 2021, 624
Issue Date:: 2021-04-15

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Field	Value	Language
dc.contributor.author	Abdollahzadeh, M
dc.contributor.author	Hosseini, E
dc.contributor.author	Ahmadi, H
dc.contributor.author	Lim, S
dc.contributor.author	Korayem, AH
dc.contributor.author	Razmjou, A
dc.contributor.author	Asadnia, M
dc.date.accessioned	2021-10-20T05:32:17Z
dc.date.available	2021-10-20T05:32:17Z
dc.date.issued	2021-04-15
dc.identifier.citation	Journal of Membrane Science, 2021, 624
dc.identifier.issn	0376-7388
dc.identifier.issn	1873-3123
dc.identifier.uri	http://hdl.handle.net/10453/151173
dc.description.abstract	Lithium carbonate and lithium hydroxide are two compounds used for producing battery cathodes, however, lithium hydroxide is favoured in producing battery compounds as it possesses very high electrochemical potential and low density. As a result, there is substantial demand for development of anion-selective membranes capable of selecting hydroxide over carbonate. Although single-layer nanosheets of Layered Double Hydroxides (LDHs) have shown anion conductivity, the reassembling of the building blocks in a membrane-like morphology will not result in a conductive membrane. Here we show that an appropriate size of LDH nanosheets with post-treatment with polydopamine (PDA) can form a highly conductive hydroxide-selective membrane. Our experimental results show that the in-plane ion conductance of the membrane for different ions is OH− > Br− > I− > NO3− > Cl− > CO32− with corresponding selectivity ratios of OH− to Br−, I−, NO3−, Cl−, CO32− found to be 2.30, 2.83, 2.99, 3.11 and 4.38 respectively, showing the membrane's excellent hydroxide selectivity. Molecular dynamics (MD) simulations revealed that the small nanochannels of LDH increase its diffusion barrier against ion permeation and cause the partial dehydration of ions. We showed that ions move inside the LDH nanochannels in a semi-dry transport manner so that they attract to the surface more than water molecules inside the nanochannels. Selectivity predictions from MD simulations were in excellent agreement with the experimental data, confirming our hypothesis about ion transport in LDH nanochannels. This work takes advantage of the semi-dry transport mechanism of anions in the narrow nanochannels of LDHs to produce a hydroxide selective membrane applicable in the production of LiOH for the new generation of Li-ion batteries.
dc.language	English
dc.publisher	ELSEVIER
dc.relation.ispartof	Journal of Membrane Science
dc.relation.isbasedon	10.1016/j.memsci.2020.118974
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	03 Chemical Sciences, 09 Engineering
dc.subject.classification	Chemical Engineering
dc.title	Low humid transport of anions in layered double hydroxides membranes using polydopamine coating
dc.type	Journal Article
utslib.citation.volume	624
utslib.for	03 Chemical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	closed_access	*
dc.date.updated	2021-10-20T05:32:14Z
pubs.publication-status	Published
pubs.volume	624

Abstract:

Lithium carbonate and lithium hydroxide are two compounds used for producing battery cathodes, however, lithium hydroxide is favoured in producing battery compounds as it possesses very high electrochemical potential and low density. As a result, there is substantial demand for development of anion-selective membranes capable of selecting hydroxide over carbonate. Although single-layer nanosheets of Layered Double Hydroxides (LDHs) have shown anion conductivity, the reassembling of the building blocks in a membrane-like morphology will not result in a conductive membrane. Here we show that an appropriate size of LDH nanosheets with post-treatment with polydopamine (PDA) can form a highly conductive hydroxide-selective membrane. Our experimental results show that the in-plane ion conductance of the membrane for different ions is OH− > Br− > I− > NO3− > Cl− > CO32− with corresponding selectivity ratios of OH− to Br−, I−, NO3−, Cl−, CO32− found to be 2.30, 2.83, 2.99, 3.11 and 4.38 respectively, showing the membrane's excellent hydroxide selectivity. Molecular dynamics (MD) simulations revealed that the small nanochannels of LDH increase its diffusion barrier against ion permeation and cause the partial dehydration of ions. We showed that ions move inside the LDH nanochannels in a semi-dry transport manner so that they attract to the surface more than water molecules inside the nanochannels. Selectivity predictions from MD simulations were in excellent agreement with the experimental data, confirming our hypothesis about ion transport in LDH nanochannels. This work takes advantage of the semi-dry transport mechanism of anions in the narrow nanochannels of LDHs to produce a hydroxide selective membrane applicable in the production of LiOH for the new generation of Li-ion batteries.

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http://hdl.handle.net/10453/151173