Self-Assembled NbOPO<inf>4</inf>Nanosheet/Reduced Graphene Oxide Heterostructure for Capacitive Desalination

Safaei, J; Mashkani, SMH; Tian, H; Ye, C; Xiong, P; Wang, G

Self-Assembled NbOPO<inf>4</inf>Nanosheet/Reduced Graphene Oxide Heterostructure for Capacitive Desalination

Safaei, J

Mashkani, SMH Tian, H

Ye, C Xiong, P Wang, G

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Publisher:: American Chemical Society
Publication Type:: Journal Article
Citation:: ACS Applied Nano Material, 2021, 4, (11), pp. 12629-12639
Issue Date:: 2021-11-26

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Field	Value	Language
dc.contributor.author	Safaei, J https://orcid.org/0000-0003-3397-5026
dc.contributor.author	Mashkani, SMH
dc.contributor.author	Tian, H https://orcid.org/0000-0002-9581-0027
dc.contributor.author	Ye, C
dc.contributor.author	Xiong, P
dc.contributor.author	Wang, G https://orcid.org/0000-0003-4295-8578
dc.date.accessioned	2022-02-08T04:10:10Z
dc.date.available	2022-02-08T04:10:10Z
dc.date.issued	2021-11-26
dc.identifier.citation	ACS Applied Nano Material, 2021, 4, (11), pp. 12629-12639
dc.identifier.issn	2574-0970
dc.identifier.issn	2574-0970
dc.identifier.uri	http://hdl.handle.net/10453/154276
dc.description.abstract	Capacitive deionization (CDI) is a promising and energy-efficient technology for desalination. The development of high-performance capacitive electrodes is essential for enhancing the CDI properties for practical applications. Here, a 2D heterostructure was rationally designed and synthesized by face-to-face restacking of NbOPO4 nanosheets and reduced graphene oxide (rGO) via an electrostatic self-assembly process. The as-prepared 2D NbOPO4/rGO heterostructure achieved an excellent ion storage capacity, electronic conductivity, and unimpeded ion kinetics. When applied as electrodes for CDI, the 2D NbOPO4/rGO heterostructure delivered a high specific capacitance of 258.3 F g-1 and an electrosorption capacity of 73 mg g-1 for NaCl solution of 10 000 mg L-1 at an applied voltage of 1.2 V, which is more than five times larger than that of activated carbon. The heterostructure electrode also showed high desalination stability for up to 50 adsorption/desorption cycles. The high CDI performance is attributed to the strong 2D/2D coupling between NbOPO4 nanosheets and rGO. The strong 2D/2D coupling reduced the charge transfer resistance, affirmed via the electrochemical impedance spectroscopy technique, attesting to the enhanced charge transportation across the heterointerface. The robust 2D/2D coupling was affirmed via the uniform and identical Raman shifts at various random regions, and larger XPS binding energy shifts for the self-assembled NbOPO4/rGO heterostructure. This work demonstrated the potential of self-assembled nanoheterostructures for water desalination via capacitive deionization.
dc.language	en
dc.publisher	American Chemical Society
dc.relation	http://purl.org/au-research/grants/arc/DP200101249
dc.relation.ispartof	ACS Applied Nano Material
dc.relation.isbasedon	10.1021/acsanm.1c03180
dc.rights	info:eu-repo/semantics/closedAccess
dc.title	Self-Assembled NbOPO<inf>4</inf>Nanosheet/Reduced Graphene Oxide Heterostructure for Capacitive Desalination
dc.type	Journal Article
utslib.citation.volume	4
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-02-08T04:09:54Z
pubs.issue	11
pubs.publication-status	Published
pubs.volume	4
utslib.citation.issue	11

Abstract:

Capacitive deionization (CDI) is a promising and energy-efficient technology for desalination. The development of high-performance capacitive electrodes is essential for enhancing the CDI properties for practical applications. Here, a 2D heterostructure was rationally designed and synthesized by face-to-face restacking of NbOPO4 nanosheets and reduced graphene oxide (rGO) via an electrostatic self-assembly process. The as-prepared 2D NbOPO4/rGO heterostructure achieved an excellent ion storage capacity, electronic conductivity, and unimpeded ion kinetics. When applied as electrodes for CDI, the 2D NbOPO4/rGO heterostructure delivered a high specific capacitance of 258.3 F g-1 and an electrosorption capacity of 73 mg g-1 for NaCl solution of 10 000 mg L-1 at an applied voltage of 1.2 V, which is more than five times larger than that of activated carbon. The heterostructure electrode also showed high desalination stability for up to 50 adsorption/desorption cycles. The high CDI performance is attributed to the strong 2D/2D coupling between NbOPO4 nanosheets and rGO. The strong 2D/2D coupling reduced the charge transfer resistance, affirmed via the electrochemical impedance spectroscopy technique, attesting to the enhanced charge transportation across the heterointerface. The robust 2D/2D coupling was affirmed via the uniform and identical Raman shifts at various random regions, and larger XPS binding energy shifts for the self-assembled NbOPO4/rGO heterostructure. This work demonstrated the potential of self-assembled nanoheterostructures for water desalination via capacitive deionization.

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http://hdl.handle.net/10453/154276